+Emily Vail Almost everything you need for most math classes is already built into the calculator, including all of the statistics and probability tools that "Using the TI-84 Plus CE" (see Table of Contents in the Manning link in the description) mentions in Chapter 9. Unfortunately, I haven't gotten around to making a video about that material yet.
Is there a way to put in x as the number for x? So you could do things like (bx^2)/x=bx? Cause this would help with dividing out factors and simplifying
If you have edited them on the default screen press the store button, then 2nd+x^1 (the matrix options) and in the names tab press the variable you want to update. This will paste the variable to the default screen so that you can finally press enter.
And to follow on to GogL0L's comment, if you edited them in the Matrix Editor, you don't have to do anything - just quit the matrix editor, and they'll be saved.
I'm 19 years out of high school but am trying to pick up the TI-84 graphic calculator for programming purposes. It's highly portable and, with the right programming, can help me in the field with quick calculations. I am not new to programming, even to TI-BASIC (though like I said, it's been a while). I'm trying to learn to store and use variables from my program. I have tried within my program using the STO arrow to assign values to variables, but it's not sticking. Do you have any suggestions? My calculator is the TI-84 Plus CE with Python.
Welcome to calculator programming: it's never too late to start! I bet you're storing to the X or Y variables: the Y variable in particular gets reset by displaying anything on the graphscreen, and the X variable is reset by graphing something. Try using other variables, namely anything A-W, Z, or theta. At the risk of self-promotion, I wrote a book on that topic as well (www.amazon.com/Programming-TI-83-Plus-TI-84/dp/1617290777/), and there are tons of friendly volunteers who can answer TI-BASIC questions at www.cemetech.net/forum/viewforum.php?f=19 .
@@KermMartian I've just sorted the solution to my problem. I did stay away from X, Y, etc. as from a programming perspective it made sense. What I was attempting was to take an integer variable A and make it into another variable B of String type. My syntax was not working, and the debugger did not catch it (or, didn't tell me about it). In the following examples, I have used a greater-than sign for formatting, but it is the STO arrow in the program. What didn't work: 100 > A toString(A) > B What does work: 100 > A A > B toString(B) This morning I just decided to DISP:PAUSE every step, figure out what wasn't going right, then figure out why. Turns out I can't make a new variable from toString().
@@mikey38632 It's actually more complicated than that: the variables A-Z and theta can only hold real or complex numbers; what you're actually doing there in the first example is trying to store a string to a numeric variable. For strings, you need to use Str0 to Str9, which you can find in the [VARS] -> String menu. Similar, L1-L6 and custom lists can be used for lists (arrays) of numbers, matrices [A] to [J] can be used for 2D matrices of real or complex numbers, etc: each variable stores only one specific datatype. e.g.: 100->A toString(A)->Str1
@@KermMartian oh, very nice! Great to learn this tip. I didn't know about the string variables yet. I'm about to give it a go, now. *edit* Thanks again for the tip. I was able to make it work with ease! It's still my HiWorld program so I can figure things out (some learning, some refreshing the memory), but no doubt I will be using this tons!
Thank you! Quick question: I know how to perform L5 = L4 + 2 but if I create two new user-defined lists say A and B, I cannot perform A = B+2 (It does not work). Can you please help me with this?
I have a problem with manipulating user-defined lists. Specifically, I cannot perform A = B+2 like I would L5 = L4 + 2. Can you please help me with this?
Thanks! Feel free to ask any followup questions you run into from your exploration with the book here or preferably on the Cemetech forum, at www.cemetech.net/forum .
how can I install programs into the calculator such as the quadrati or distance? For some reason, I can't transfer the programs from a TI 84 plus calculator to my plus CE. I clicked receive first and then tried to transfer the programs, but it didn't work. it says error in Xmit or something. It would mean a lot if you could also create a video on how to do this..
Hi, this really helped. But I don’t know how to reset x back to what it was originally because I did what u do in the video... I saw another question of this but I didn’t understand your anwser. Any help is appreciated, thx.
You have at least two options: (1) you can store 0 to X ([0][STO>][XT0n][ENTER]), or (2) you can just overwrite X with a new value ([STO][XT0n][ENTER]). Is that what you were asking?
@@KermMartian What does ([0][STO>][XT0n][ENTER]) means? LOL sorry!! Your videos are GREAT, but please add how to undo the items you are teaching. Please!! However, I learned sooooo much from you. Great job!
@@bridgethughes9738 That sequence of keypresses will store the value 0 into the variable X, but you shouldn't need to specifically "undo" it: for example, the next time you graph something, the calculator will overwrite the value of X on its own. Thanks for the kind words; I'm glad you learned a lot!
Victoria: you can use the DelVar command found in the Catalog ([2nd][0]). However, you generally don't *need* to delete variables; you can just use them again and they'll be overwritten.
Good question: you change the graphing mode in the [MODE] menu to PARAMETRIC, POLAR, or SEQ. You can also type X, T, and theta with [ALPHA] followed by the corresponding key on the keypad ([STO->], [4], and [3] respectively), and n with [VARS], [5], [1].
Apologies for the slow response. The O is actually the Greek letter theta; if you switch the calculator into Polar mode (from the [MODE] menu), pressing [XTOn] produces theta instead of X. You can also get theta in any graphing mode by pressing [ALPHA][3].
@@KermMartian It says Error: Domain (value entered is not allowed in the function or command). We just entered some decimals for applying a chi-squared test. Can the reason be the number of decimal places (they are different, some has 3 some 4)? Thanks for the quick reply )
Number of decimal places shouldn't cause that error. A DOMAIN error generally refers to the wrong type of number in a given place, e.g. giving a decimal number instead of an integer for the matrix dimensions, or the length of a list, etc. If you're using the matrix editor directly, please make sure you're entering the values within the lower portion of the screen (i.e., not the dimensions on the top row).
@@KermMartian no no, the decimals were entered into the cells, like the 1st row and 2 column for example, not as dimensions of a matrix. I am still wondering as to why it could be an error.
I think no, check the comments of the previous chapter where there is a similar question and @KermMartian answers that question in a more detailed way.
That's correct; the built-in software can only solve an equation in the form of f(x) = g(x) (or, on the slightly older calculators, 0 = f(x)). What kind of equation are you trying to solve?
Certainly! A list is a one-dimensional ordered set of numbers, for example [1, 5, -4.239, 0]. You can use lists for many different things, such as sets of numbers collected from an experiment (individual grades on a test, heights on plants exposed to a certain amount of sunlight, number of minutes late or early trains arrived), things like coordinates (although you'd need a list of X coordinates and a list of Y coordinates), etc. Matrices, on the other hand, are two-dimensional sets of numbers, and are used for too many interesting things for me to enumerate here. If you take a look at Chapter 4 of "Using the TI-84 Plus", it explains all of this in more detail.
You can go to the Solver ([MATH], go to the bottom, Solver...) and use that to solve for X in an equation of the form 0=f(X) (on older calculators) or f(X)=g(X) (on newer calculators).
You generally don't need to, but if you really want to, you can do [0][STO>][XT0n] (that is, "0->X"), or go to the [2nd][+][2] (Mem Mgmt -> Delete) menu and delete it.
No ASAP needed; I tend to respond to polite questions promptly anyway. :P You don't really need to clear variables; you can just reuse them. If you really want to remove them, you can go to [2nd][+] (Mem), then 2: Mem Mgmt/Delete, then the type of variable you want to delete. Find the variable(s) you want to delete, and press [DEL].
That does not work. First, maybe I do not understand how to select the X variable; second, when I select what I think is the X variable (which appears along with other letters to have a value of 18 not 3) I get an error that says "Variable cannot be moved either to or from Archive." However, as you mentioned below, once I ran a graph of a new y= function, the value held by X changed.
It sounds like you might have archived your X variable accidentally, but perhaps graphing a new Y= function forced the calculator to unarchive X. You can manually archive and unarchive variables in the Memory menu, under [2nd][+] (Memory), [2] (Memory Management/Delete), Reals, and then press [ENTER] next to the variable you want to archive or unarchive. An asterisk next to a variable indicates that it is archived. What are you trying to do, exactly?
Like commenter Evelin I was concerned that having 3 stored in X would affect other uses of X (to be honest I am not sure why storing a value in X would ever makes sense. Perhaps if it was a long decimal that you did not want to have to enter multiple times?). In hindsight, I believe I have learned it is not a concern (proved by seeing the value change after graphing a fresh function), but my point was the instructions did not provide a path to erase the value 3 in X. BTW, no asterisks in any of the variables in the "real" section.
+Catalina Vargas Valverde Unfortunately, you cannot put variables into a matrix and have them reflect the current value of that variable. For example, you can't have a matrix containing [[0 A][1 B]] and have it update every time you change the value of A and B. However, you can change the individual elements' values of (for example) matrix C like this: 2.5->[C](1,2). This sets the element at row 1, column 2 of matrix [C] to 2.5.
Joshua Treeful Depends on the Variable. REAL Vars default to zero when accessed. List and Matrix variables, however, are not so lucky - should you try to access a variable stored here that doesn't exist, you get an error message.
Just past the 11 minute mark on this video where you try to select the dimensions of the matrix, I try using the arrow keys but all it does is take me to FUNC, YVAR, etc. I can't arrow like you do.
After you press [ALPHA][ZOOM] (F3), press the [up] arrow once, and then you'll be able to move left and right inside that menu. It's not that intuitive.
joey meyers You can't undo it, but you can store a different value to X simply by doing, say, -42 ->X. Or, you could store the value of X to a different variable before you set X, for example first doing X ->A and then 3 ->X. Then A would contain X's old value, and X would contain 3.
joey meyers Nope! When your calculator draws a graph, it actually plugs in the X coordinates of all the pixels on the screen as it graphs, overwriting whatever you had in X. If you look at X after you graph something, you'll see that it's equal to Xmax.
joey meyers I'm glad to help! I hope you'll grab a copy of "Using the TI-84 Plus" to help out with your calculator, and keep watching for future videos in this series.
+Emily Vail Almost everything you need for most math classes is already built into the calculator, including all of the statistics and probability tools that "Using the TI-84 Plus CE" (see Table of Contents in the Manning link in the description) mentions in Chapter 9. Unfortunately, I haven't gotten around to making a video about that material yet.
my calculator for the variable button it uses T is there a way to change it back to x?
Check the mode, it should be function@@emmarywalski1944
@@emmarywalski1944 USE FUNCTION
Great videos! need to learn this calculator in 2 days before an exam!
Good luck! Feel free to post if you have any questions.
Thank you! this was very helpful
Glad to hear it; you're welcome! Let me know if you have any questions.
Be careful when you Enter the Matrix.....mode, Mr. Ander....err....
How do I add an x value into a table that already has a list of x and y values?
Is there a way to put in x as the number for x? So you could do things like (bx^2)/x=bx? Cause this would help with dividing out factors and simplifying
Unfortunately, the TI-84 Plus CE cannot symbolically solve equations.
How do you store matrices? For example, I edited Matrix A so how do I save the changes I made??
If you have edited them on the default screen press the store button, then 2nd+x^1 (the matrix options) and in the names tab press the variable you want to update. This will paste the variable to the default screen so that you can finally press enter.
And to follow on to GogL0L's comment, if you edited them in the Matrix Editor, you don't have to do anything - just quit the matrix editor, and they'll be saved.
I'm 19 years out of high school but am trying to pick up the TI-84 graphic calculator for programming purposes. It's highly portable and, with the right programming, can help me in the field with quick calculations.
I am not new to programming, even to TI-BASIC (though like I said, it's been a while). I'm trying to learn to store and use variables from my program. I have tried within my program using the STO arrow to assign values to variables, but it's not sticking. Do you have any suggestions?
My calculator is the TI-84 Plus CE with Python.
Welcome to calculator programming: it's never too late to start! I bet you're storing to the X or Y variables: the Y variable in particular gets reset by displaying anything on the graphscreen, and the X variable is reset by graphing something. Try using other variables, namely anything A-W, Z, or theta.
At the risk of self-promotion, I wrote a book on that topic as well (www.amazon.com/Programming-TI-83-Plus-TI-84/dp/1617290777/), and there are tons of friendly volunteers who can answer TI-BASIC questions at www.cemetech.net/forum/viewforum.php?f=19 .
@@KermMartian I've just sorted the solution to my problem. I did stay away from X, Y, etc. as from a programming perspective it made sense.
What I was attempting was to take an integer variable A and make it into another variable B of String type.
My syntax was not working, and the debugger did not catch it (or, didn't tell me about it). In the following examples, I have used a greater-than sign for formatting, but it is the STO arrow in the program.
What didn't work:
100 > A
toString(A) > B
What does work:
100 > A
A > B
toString(B)
This morning I just decided to DISP:PAUSE every step, figure out what wasn't going right, then figure out why. Turns out I can't make a new variable from toString().
@@mikey38632 It's actually more complicated than that: the variables A-Z and theta can only hold real or complex numbers; what you're actually doing there in the first example is trying to store a string to a numeric variable. For strings, you need to use Str0 to Str9, which you can find in the [VARS] -> String menu. Similar, L1-L6 and custom lists can be used for lists (arrays) of numbers, matrices [A] to [J] can be used for 2D matrices of real or complex numbers, etc: each variable stores only one specific datatype. e.g.:
100->A
toString(A)->Str1
@@KermMartian oh, very nice! Great to learn this tip. I didn't know about the string variables yet. I'm about to give it a go, now.
*edit* Thanks again for the tip. I was able to make it work with ease! It's still my HiWorld program so I can figure things out (some learning, some refreshing the memory), but no doubt I will be using this tons!
How do i change the letters from lower to upper case?. My 2nd does lower case and my alpha does upper.
Thank you! Quick question: I know how to perform L5 = L4 + 2 but if I create two new user-defined lists say A and B, I cannot perform A = B+2 (It does not work). Can you please help me with this?
Have you tried B+2->A?
I have a problem with manipulating user-defined lists. Specifically, I cannot perform A = B+2 like I would L5 = L4 + 2. Can you please help me with this?
Kindly tell me how fundamental constants are used in dinominators in any formula.
Could it solve a matrix that has a 8x8 dimension?
Great videos
Thank you!
How do i clear the number assigned to the variable.
You can just store a new number over it (e.g. 0->X), or you can use the Memory menu ([2nd][+][2]) to delete the variable.
Thank you - very useful!
You're welcome; happy to help!
Great information! I just ordered your book to learn more. Thank you.
Thanks! Feel free to ask any followup questions you run into from your exploration with the book here or preferably on the Cemetech forum, at www.cemetech.net/forum .
how can I install programs into the calculator such as the quadrati or distance? For some reason, I can't transfer the programs from a TI 84 plus calculator to my plus CE. I clicked receive first and then tried to transfer the programs, but it didn't work. it says error in Xmit or something. It would mean a lot if you could also create a video on how to do this..
Hi, this really helped. But I don’t know how to reset x back to what it was originally because I did what u do in the video... I saw another question of this but I didn’t understand your anwser. Any help is appreciated, thx.
You have at least two options: (1) you can store 0 to X ([0][STO>][XT0n][ENTER]), or (2) you can just overwrite X with a new value ([STO][XT0n][ENTER]). Is that what you were asking?
@@KermMartian What does ([0][STO>][XT0n][ENTER]) means? LOL sorry!! Your videos are GREAT, but please add how to undo the items you are teaching. Please!! However, I learned sooooo much from you. Great job!
@@bridgethughes9738 That sequence of keypresses will store the value 0 into the variable X, but you shouldn't need to specifically "undo" it: for example, the next time you graph something, the calculator will overwrite the value of X on its own.
Thanks for the kind words; I'm glad you learned a lot!
This is such a cool calculator :o
I think so too! It's one of my favorites.
how do you get rid of the stored variable?
+Zach Telsey Numeric variables take up very little memory, but you can delete variables from the [2nd][+] (Memory) menu.
+KermMartian thanks for the quick reply! Love the videos
+Zach Telsey Thanks! I'm hoping to get the chance to continue the series soon.
2nd, +, 7, 1, 2
How do I get rid of the variables without deleting all of the other data and setting that I have?
Victoria: you can use the DelVar command found in the Catalog ([2nd][0]). However, you generally don't *need* to delete variables; you can just use them again and they'll be overwritten.
KermMartian Thank you!
how do you change X to either T, n or theta which is on the same button as X
Good question: you change the graphing mode in the [MODE] menu to PARAMETRIC, POLAR, or SEQ. You can also type X, T, and theta with [ALPHA] followed by the corresponding key on the keypad ([STO->], [4], and [3] respectively), and n with [VARS], [5], [1].
@@KermMartianthanks
On the calculator, it showsa button that says X,T,O,N. How do I choose O
Apologies for the slow response. The O is actually the Greek letter theta; if you switch the calculator into Polar mode (from the [MODE] menu), pressing [XTOn] produces theta instead of X. You can also get theta in any graphing mode by pressing [ALPHA][3].
Could the calculator solve an equation like: 5[( 3x^5]^3? If so, how?
Can you please tell me why would I get an error entering a decimal into the matrix?
Sure! What error are you receiving? What value are you trying to enter?
@@KermMartian It says Error: Domain (value entered is not allowed in the function or command). We just entered some decimals for applying a chi-squared test. Can the reason be the number of decimal places (they are different, some has 3 some 4)? Thanks for the quick reply )
Number of decimal places shouldn't cause that error. A DOMAIN error generally refers to the wrong type of number in a given place, e.g. giving a decimal number instead of an integer for the matrix dimensions, or the length of a list, etc. If you're using the matrix editor directly, please make sure you're entering the values within the lower portion of the screen (i.e., not the dimensions on the top row).
@@KermMartian no no, the decimals were entered into the cells, like the 1st row and 2 column for example, not as dimensions of a matrix. I am still wondering as to why it could be an error.
is the equal sign to write somthing like 10x=49-18
I think no, check the comments of the previous chapter where there is a similar question and @KermMartian answers that question in a more detailed way.
umm i have an error invalid dimension when doing L sub 1 for a list. Do you know how to fix that?
That generally means that the list is empty (no elements). What were you trying to do with it?
How can I get my calculator to use both the X and Y variable in solving an equation? It keeps only showing X and I can't get it to do both.
That's correct; the built-in software can only solve an equation in the form of f(x) = g(x) (or, on the slightly older calculators, 0 = f(x)). What kind of equation are you trying to solve?
Can you please remind me what a list is for and what exactly are matrices again?
Certainly! A list is a one-dimensional ordered set of numbers, for example [1, 5, -4.239, 0]. You can use lists for many different things, such as sets of numbers collected from an experiment (individual grades on a test, heights on plants exposed to a certain amount of sunlight, number of minutes late or early trains arrived), things like coordinates (although you'd need a list of X coordinates and a list of Y coordinates), etc.
Matrices, on the other hand, are two-dimensional sets of numbers, and are used for too many interesting things for me to enumerate here. If you take a look at Chapter 4 of "Using the TI-84 Plus", it explains all of this in more detail.
can i change the x to nothing, as something i need to solve? how do i do that?
You can go to the Solver ([MATH], go to the bottom, Solver...) and use that to solve for X in an equation of the form 0=f(X) (on older calculators) or f(X)=g(X) (on newer calculators).
How do I clear the x variable?
You generally don't need to, but if you really want to, you can do [0][STO>][XT0n] (that is, "0->X"), or go to the [2nd][+][2] (Mem Mgmt -> Delete) menu and delete it.
How do you clear the value you put into the variable?
please answer asap, my regents exam is tomorrow and I can't have 3 saved as "x"
No ASAP needed; I tend to respond to polite questions promptly anyway. :P You don't really need to clear variables; you can just reuse them. If you really want to remove them, you can go to [2nd][+] (Mem), then 2: Mem Mgmt/Delete, then the type of variable you want to delete. Find the variable(s) you want to delete, and press [DEL].
That does not work. First, maybe I do not understand how to select the X variable; second, when I select what I think is the X variable (which appears along with other letters to have a value of 18 not 3) I get an error that says "Variable cannot be moved either to or from Archive." However, as you mentioned below, once I ran a graph of a new y= function, the value held by X changed.
It sounds like you might have archived your X variable accidentally, but perhaps graphing a new Y= function forced the calculator to unarchive X. You can manually archive and unarchive variables in the Memory menu, under [2nd][+] (Memory), [2] (Memory Management/Delete), Reals, and then press [ENTER] next to the variable you want to archive or unarchive. An asterisk next to a variable indicates that it is archived. What are you trying to do, exactly?
Like commenter Evelin I was concerned that having 3 stored in X would affect other uses of X (to be honest I am not sure why storing a value in X would ever makes sense. Perhaps if it was a long decimal that you did not want to have to enter multiple times?). In hindsight, I believe I have learned it is not a concern (proved by seeing the value change after graphing a fresh function), but my point was the instructions did not provide a path to erase the value 3 in X. BTW, no asterisks in any of the variables in the "real" section.
The calculator is not allowing me to put negative numbers in my matrix
Make sure you use the negative key (the one with the (-) on it), not the subtraction key.
Hey my calculator I'd screwed up now...now that my variables are under a number I can't do a simple equation like -15.3+4.2b= -3.96!!
Can you be more specific?
@@KermMartian nevermind sorry I was just being illiterate!😂
How can I create a matrix with letters? I mean with variables?
+Catalina Vargas Valverde Unfortunately, you cannot put variables into a matrix and have them reflect the current value of that variable. For example, you can't have a matrix containing [[0 A][1 B]] and have it update every time you change the value of A and B. However, you can change the individual elements' values of (for example) matrix C like this: 2.5->[C](1,2). This sets the element at row 1, column 2 of matrix [C] to 2.5.
3:40 Part 3.2: Lists
How can you use variables without a value?
Joshua Treeful Depends on the Variable. REAL Vars default to zero when accessed. List and Matrix variables, however, are not so lucky - should you try to access a variable stored here that doesn't exist, you get an error message.
Just past the 11 minute mark on this video where you try to select the dimensions of the matrix, I try using the arrow keys but all it does is take me to FUNC, YVAR, etc. I can't arrow like you do.
After you press [ALPHA][ZOOM] (F3), press the [up] arrow once, and then you'll be able to move left and right inside that menu. It's not that intuitive.
its easier for me to draw the graphs than to use the ti plus ce
Then perhaps you should either watch the rest of these videos or read the book, so you can learn how easy it can be!
alpha F3 doesn't do anything on my CE
+Texan1048 Are you on the homescreen? You can turn those menus back on from the [MODE] menu.
Ik
How do I undo storing X as 3?
joey meyers You can't undo it, but you can store a different value to X simply by doing, say, -42 ->X. Or, you could store the value of X to a different variable before you set X, for example first doing X ->A and then 3 ->X. Then A would contain X's old value, and X would contain 3.
+KermMartian but if I then go to graph an equation such as 5X-3 it will register as 5(3)-3 right?
joey meyers Nope! When your calculator draws a graph, it actually plugs in the X coordinates of all the pixels on the screen as it graphs, overwriting whatever you had in X. If you look at X after you graph something, you'll see that it's equal to Xmax.
+KermMartian okay that makes sense thank you and I learned a lot from your videos thank you because I haven't found any better videos out there!
joey meyers I'm glad to help! I hope you'll grab a copy of "Using the TI-84 Plus" to help out with your calculator, and keep watching for future videos in this series.
+Beda Mundo take a look at this video I created on the topic: ua-cam.com/video/0BIOzCgumQM/v-deo.html
Why the fuck do we hear a fucking nuclear siren at 8:25 ?????????