How to calculate Driving Distance Matrix on Excel using Bing Maps API

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  • Опубліковано 30 лис 2024

КОМЕНТАРІ • 171

  • @SensekariYogi
    @SensekariYogi 4 роки тому +6

    Very structured & elaborate explanation. Must watch for all aspiring learners.

  • @lucastavares3470
    @lucastavares3470 3 роки тому +8

    You have help me a lot ! I’m making a cost sheet , using Kilometers from every city from state of São Paulo

  • @sudheerkumar6427
    @sudheerkumar6427 3 роки тому +2

    Good work Hemanth Boddapu... expecting more videos from you..

  • @srinivasannarayanaswami5378
    @srinivasannarayanaswami5378 3 роки тому +2

    Thank you Hemanth. Lucid explanation and a very useful tool. Much appreciated

  • @vidaan95
    @vidaan95 2 роки тому

    Hi Hemanth, this is a wonderful video. It really saved a huge amount of time for me.

  • @leroyjenkins5679
    @leroyjenkins5679 2 роки тому +6

    Excellent hemant, just one observation though - Since api keys have limits, every call is precious. Hence filling only the upper half of the diagonal would have been wise. Also from efficient programming perspective it is important

  • @fulyaulutas4599
    @fulyaulutas4599 2 роки тому +1

    This is exactly what i needed. Thank you for explaining very clearly

  • @himanshushukla3454
    @himanshushukla3454 4 роки тому +2

    Thank you Hemanth for such insightful videos

  • @ssaravananp1
    @ssaravananp1 3 роки тому +3

    Dear Mr.Hemanth, It was a useful App. We have around 25 rows and columns in our Application. The macro works correctly upto 12 rows and columns. From 13th row and column, there is a difference of at the least 2 Kms. Please guide us.
    Regards,
    S.Saravanan

  • @spvgggwdeg
    @spvgggwdeg 2 роки тому

    This is amazing and very, very helpful for me. Thanks a lot for the well elaborated explanation.

  • @blue0152
    @blue0152 3 роки тому +2

    THANK YOU! You did miss that input for Source and Destination coordinates. Also you could have clarified the best way to get the coordinates in the database tab. OTHERWISE, this is an excellent video and I really appreciate it!

  • @prafullgoyal24
    @prafullgoyal24 3 роки тому +2

    Awesome...I need to hit like button for tonnes but have to satisfy with 1 only..✌

  • @gouthamsolleti4316
    @gouthamsolleti4316 3 роки тому +1

    Good work bro....working perfectly....

  • @widhyawanjuliaris3939
    @widhyawanjuliaris3939 5 місяців тому

    thank you very much for the knowledge. you've helped me in many ways.

  • @philcoul6905
    @philcoul6905 3 роки тому +1

    Good work. This exactly what was looking for. Keep up.

  • @rajaaditya0021
    @rajaaditya0021 2 роки тому

    Awesome sir!
    Helped a lot during SIP... Thank you so much!

  • @TheArtlessArtist
    @TheArtlessArtist 4 роки тому +1

    Lovely work Hemanth
    Keep up the good work ❣️

  • @siddharthamodukuri7112
    @siddharthamodukuri7112 2 роки тому

    Thanks Hemanth, Very helpful

  • @alexanderbarlse2875
    @alexanderbarlse2875 2 роки тому +4

    Hi there! Thank you for this great piece of code, it helped me a lot. However, i'm having a small issue. The code was running perfectly well yesterday. However, men reopening the xlsm file today, and trying to use the getdistance function, I get the error: #NAME?. Do you have any suggestions?
    Thank you.

  • @sohamdsouza
    @sohamdsouza 4 роки тому +1

    Great work Hemanth !

  • @aphastus
    @aphastus 3 роки тому +1

    Wow I tried not knowing if it’d work because I’ve never coded in VBA and I did a couple mistakes that I was able to detect and understand watching my code and yours (mostly cells placements). I used the time instead of the distance. It is incredibly satisfying watching the code fill all the cells in the matrix. I started in Mac but the getdistance formula didn’t work. I’ll try it later to see if something wasn’t correct. What bugged me is that every version of office uses different separators, you used a , and I had to change it to a ; so probably it’s the same problem with Mac. Anyway, thanks so much for the video, it was so nice!

    • @HEMANTHHEMU86
      @HEMANTHHEMU86  3 роки тому

      Hey.. the issue with mac is that excel in mac cannot talk to internet. Pls try with windows. I've mentioned the same in the description box

  • @Bhoomisolanki0210
    @Bhoomisolanki0210 2 роки тому

    Very Helpful video, Thank you !

  • @Michael-zg5cx
    @Michael-zg5cx 4 місяці тому +1

    Hey
    Great work! I used your code for two years now. But with the change to Azure Maps I don't get this think working anymore... can you make a new video where you explain how to use Azure Maps API instead of Bing Maps?

  • @lucastavares3470
    @lucastavares3470 3 роки тому

    Greetings from Brazil 🇧🇷

  • @MrJaawt
    @MrJaawt 2 роки тому +1

    right now the calculation automatically grabs the shortest distance and not the interstate distance. how could I change the VBS Module to show the shortest interstate distance? But thank you very much for this so far

  • @ronnieencarnacion5729
    @ronnieencarnacion5729 4 роки тому +3

    Excel returned #value! when computing for the Distance. Followed the procedure. Concactenate and keys are correct. May i know if this is common issue and if it can be resolved. Thanks.

    • @HEMANTHHEMU86
      @HEMANTHHEMU86  4 роки тому

      If you are using excel on windows, this should not occur. once revisit the steps i have mentioned and make sure internet is active. Let me know

    • @reaper_gaming_live
      @reaper_gaming_live 3 роки тому

      Same error with me how can we know if this not getting blocked due to some firewall issue etc

    • @HEMANTHHEMU86
      @HEMANTHHEMU86  3 роки тому

      @@reaper_gaming_live pls follow the steps. It works

    • @farooqa114
      @farooqa114 3 роки тому

      I think error is due to the concatenate function. I used the cancat function but Hemanth used the & sign while getting the X Y coordinates....Kindly explain the destination and source coordinates please.

    • @jairopontes81
      @jairopontes81 3 роки тому +3

      I was having the same issue. It happens that I use metric system in my pc, in which the decimals are separeted with a coma, not a point. I changed these parameters in the options tab and it worked!

  • @younessfrichi2156
    @younessfrichi2156 4 роки тому +3

    Thank you for the video. Please how can we get the travel time instead of the distance?

    • @HEMANTHHEMU86
      @HEMANTHHEMU86  4 роки тому +2

      Very simple, in the code i have attached, towards the end of the code, there is a phrase "//TravelDistance". You need to replace it with "//TravelDuration" and remove 1.609 multiplier

    • @younessfrichi2156
      @younessfrichi2156 4 роки тому +2

      @@HEMANTHHEMU86 Thank you. It works :)

    • @nanakipshidze3898
      @nanakipshidze3898 4 роки тому

      @@HEMANTHHEMU86 thank you for great video. is it possible to calculate walking distance instead of driving distance?

    • @khinthiri1061
      @khinthiri1061 3 роки тому

      @@younessfrichi2156 Hello!! I also want to calculate the travel time. Could you please give me some reference coding for calculating the travel time instead of travel distance?

  • @Antizokker
    @Antizokker Рік тому

    Thanks for the Video! But how do i get the field like B11 and which are necessary for the automasation to fill out the Matrix??

  • @karstenhaberkorn6182
    @karstenhaberkorn6182 4 роки тому +6

    Hello Hemanth, this is really very helpful and a great tool - thank you for that! Can you also advise, on how to get coordinates (latitude and longitude) back from bing maps for given locations? This would be very helpful, in case you need coordinates for many addresses (comparable to the list of locations you put into the "database sheet"). Many thanks for any advice! Karsten

    • @jacky_23
      @jacky_23 3 роки тому +1

      I had this problem and used power query web connector

  • @catquynhnguyenle99
    @catquynhnguyenle99 3 роки тому

    Thank you so much for providing this video

  • @jamesa7576
    @jamesa7576 3 роки тому +1

    This is awesome! Thank you

  • @Suman-vv5gv
    @Suman-vv5gv Рік тому

    Thanks for this Video ...

  • @ankurdikshit4669
    @ankurdikshit4669 3 роки тому +2

    followed all the steps, still after using formula excel is returning #value! error, may i know how can it be resolved

  • @TrudiDay
    @TrudiDay Рік тому

    Awesome - thank you!!

  • @katieallinson5781
    @katieallinson5781 3 роки тому +1

    Hemanth - please please can you tell me how to make bing maps return the longest distance between two points.

  • @ghanshyamsinhdvadher3119
    @ghanshyamsinhdvadher3119 2 роки тому

    Thanks great help, can u check the same can be converted into AddIn, i was unable to do it

  • @TomCat-hp6mi
    @TomCat-hp6mi Рік тому

    I want to do something similar. I want to know the distance travelled by the train from station A to station B. Please tell me how to do it.

  • @sidneyro5554
    @sidneyro5554 2 роки тому

    Hi, excellent tutorial. Would you help me .the negative coordinates of the error how do I?? positive coordinates works. thanks🙂

  • @meetyadav416
    @meetyadav416 Рік тому

    Awsome dude 😮

  • @Alphabah95
    @Alphabah95 3 роки тому +3

    Hello, I found your video very helpful for my project, I am a master's degree student. I had some issues linking the geographical coordinates to the distance Matrix like you did, can you explain to me or send me the excel file you did the demonstration on UA-cam? so I can refer to that to build my own matrix?
    Thank you your help will be really appreciated.

    • @michalzila7084
      @michalzila7084 Рік тому

      I tried it and i doesn't work. Variable not defined.

  • @TAMALCHOUDHURYROY
    @TAMALCHOUDHURYROY 3 роки тому +1

    Hello Hemanth,
    In my pc excel 2013 / office 365, formula "=getdistance" is not showing
    Can you please help me how can I resolve this issue?

    • @HEMANTHHEMU86
      @HEMANTHHEMU86  3 роки тому

      I have provided a peice of VBA code in the description. Please do paste it in your vba window.

  • @TheNitoperez
    @TheNitoperez Рік тому

    Desde Mexico.... funciona al 100%

  • @RodrigoSebastianBuchiniz
    @RodrigoSebastianBuchiniz 2 роки тому +1

    Genial! Gracias muy útil y muy bien explicado!

  • @WorkEasyGo
    @WorkEasyGo Рік тому

    Hi How did you connect database to sheet one. Can someone please help me out with the formula.

  • @superintendentofpolicememb3560
    @superintendentofpolicememb3560 3 роки тому

    Thanks but I follow your instruction but GetDistance formula not shown in Excel-2019

  • @infinitedata7088
    @infinitedata7088 4 роки тому +1

    It is very useful, but Im facing a error actually my all study locations are within of 4 km range. I need accurate ans in upto 2 decimal.

    • @HEMANTHHEMU86
      @HEMANTHHEMU86  4 роки тому +1

      In the code i have given, there is an equation similar to the one i have pasted below. Just replace this line with the existing line to get a more accurate reading.
      GetDistance = Round(Round(WorksheetFunction.FilterXML(objHTTP.ResponseText, "//TravelDistance"), 3) * 1.609, 2)

    • @infinitedata7088
      @infinitedata7088 4 роки тому +1

      @@HEMANTHHEMU86 Thank you very

  • @lucastavares3470
    @lucastavares3470 3 роки тому

    Omg man , awesome work

  • @2909remco
    @2909remco 3 роки тому +2

    Thank you for this great video. Would it be possible to also provide the associated GetTravelTime code? Much appreciated

  • @guonorman51
    @guonorman51 2 роки тому

    Thanks for your video clip

  • @ambarukanasubrahmanyam51
    @ambarukanasubrahmanyam51 Рік тому

    excellent video

  • @Topcommi
    @Topcommi 4 роки тому +1

    Hi, thanks.
    In small distance it works not good, because when I have 4,5km it shows me 5km..
    Can u make a video how to get the minutes from the distance.

    • @HEMANTHHEMU86
      @HEMANTHHEMU86  4 роки тому +1

      In the code i have given, there is an equation similar to the one i have pasted below. Just replace this line with the existing line to get a more accurate reading.
      GetDistance = Round(Round(WorksheetFunction.FilterXML(objHTTP.ResponseText, "//TravelDistance"), 3) * 1.609, 2)

    • @Topcommi
      @Topcommi 4 роки тому +1

      @@HEMANTHHEMU86
      Thanks great work. It is possible to calculate the travel time with car in excel ?

    • @HEMANTHHEMU86
      @HEMANTHHEMU86  4 роки тому +1

      @@Topcommi yes travel time is possible

    • @Michael_Hamburg
      @Michael_Hamburg 2 роки тому

      @@HEMANTHHEMU86 is it possible to do this for public transport too?

  • @adrianesc7706
    @adrianesc7706 2 роки тому +1

    What if i don't have the coordinates?

  • @irenesolmone7667
    @irenesolmone7667 Рік тому

    Hi! I used the formula and everything worked perfectly well for a while. Now, excel isn't recognizing the formula anymore. Do you have any advice on how to solve this?

  • @jenildesai5565
    @jenildesai5565 8 місяців тому

    This code is working for India's coordinates. But it is not working for USA coordinates.
    Please help.

  • @bubblesarita1428
    @bubblesarita1428 Рік тому

    Excellent👍

  • @gowthamseshadri5118
    @gowthamseshadri5118 2 роки тому

    How to get the coordinates for any locations using API. It is really difficult to get lat & long for every locations manually. Please guide me.

    • @HEMANTHHEMU86
      @HEMANTHHEMU86  2 роки тому

      It's not difficult. There are Google and Bing APIs for that

  • @unnikrishnansanthosh
    @unnikrishnansanthosh 2 роки тому

    hi Hemanth, thank you very much for sharing such an useful tutorial, great work. I would like to know whether you have a tutorial for calculating air distance

    • @unnikrishnansanthosh
      @unnikrishnansanthosh 2 роки тому

      Also, one more query, what is the base for calculating travel time - like is it based on speed limits of the roads or peak time / off peak time traffic on the roads

    • @HEMANTHHEMU86
      @HEMANTHHEMU86  2 роки тому

      time is given by Bing, based on the traffic data. just like Google provides on estimated time.

  • @grizzoff
    @grizzoff 3 роки тому

    Amazing! Thank you!!

  • @bhargavagatla3583
    @bhargavagatla3583 9 місяців тому

    Hi.. Can we get the distances by pincode to pincode

  • @hakanyldz9977
    @hakanyldz9977 3 роки тому

    Can we draw route line inside the excel bing map for to make travelling salesman problem?

  • @nicolesamson380
    @nicolesamson380 2 роки тому

    This works perfectly, Thank you so much Hemanth. When im working on a larger data set it takes quite a lot of time for it to fetch the distance, is there any work around for that?
    TIA.

  • @user-epslesvou
    @user-epslesvou 3 місяці тому

    Hi ... i cant create a bing key. It s not working anymore...any help?

  • @vigneshkr9497
    @vigneshkr9497 6 місяців тому

    how to do this between pincodes within the city?

  • @sergio_molinari
    @sergio_molinari 2 роки тому

    Hello great tutorial!!
    I noticed that it considers the Highways, how can I not consider them in the search?
    Thank you

  • @Gabriel-Oliveira
    @Gabriel-Oliveira 3 роки тому +1

    Hi Mr. Boddapu. Firstly, I really appreciate the time you spent recording this video. It was really important for my understanding when it comes to create a distance matrix.
    I have a question, if I have 12 locations, I think the total number os distances would be 144 (12*12) instead of 66, am I right?
    Cheers from Brazil!

  • @eetigupta7840
    @eetigupta7840 3 роки тому +1

    Hi, your video helped me a lot in my client deliverable. Thanks a ton.
    Is there a possibility to get the travel time for a particular date and time? I am looking to calculate travel time for historical date and time

  • @narejo223
    @narejo223 2 роки тому

    lastVal = "&travelMode=driving&o=xml&key=" & key & "&distanceUnit=mi" if for meters than what will be correct code instead of miles

  • @ranjitsakhare
    @ranjitsakhare Рік тому

    Hemant thanks a lot. Its helping a lot. Like function GetDistance can you help with GetTime as well?

  • @faisalalkaabneh4020
    @faisalalkaabneh4020 3 роки тому

    this is amazing, thanks a lot :)

  • @tommyexceltricks7665
    @tommyexceltricks7665 2 роки тому

    Hello , Thanks for this tutorial
    can i ask about something
    Q1:why ther's diffrence between bing maps and Google maps
    Ex: two cordination ( lat,long) in bing maps : 16 Km -- Google maps : 13
    Q2:some times result returned from bing maps doesn't exact the result already in bing maps if you switched to bing maps and tried to get direction to comapre result in excel file with data in bing maps
    thanks in advance

  • @rohitdadi7898
    @rohitdadi7898 Рік тому

    Can you share the link....of the code pls......hyperlink is missing

  • @ahmadutsmansiddiq4344
    @ahmadutsmansiddiq4344 Рік тому

    Hi, I really love your tutorials, but why do I get the output "-1" instead of the real travel distance? I already did exactly the same as shown in your video. Thank you

    • @HEMANTHHEMU86
      @HEMANTHHEMU86  Рік тому +1

      i am guessing, in the input data, some formatting might be needed

    • @jenildesai5565
      @jenildesai5565 8 місяців тому

      ​@@HEMANTHHEMU86hi i am also getting the same error. I checked the formatting it's same as yours. Still getting -1 as the output. Please help

  • @dindazalfa
    @dindazalfa 2 роки тому

    Hello Hemanth, can you help me to make vba code for calculate distance and travel time without toll usage in BingMaps?

  • @anitasunildesai
    @anitasunildesai 2 роки тому

    hello Hemanth, can we do the same giving lat and long instead of name of cities? how?

  • @saikiran-zn4cq
    @saikiran-zn4cq 4 роки тому +1

    Thanks dude.

  • @gokaykkaya
    @gokaykkaya 11 місяців тому

    can this method be used for 80 locations?

  • @josegutierrez4969
    @josegutierrez4969 3 роки тому +1

    I LOVE YOU

  • @jacky_23
    @jacky_23 3 роки тому

    Good video !!

  • @alejandrapinoncely7040
    @alejandrapinoncely7040 3 роки тому

    Hi! great job! The code is working but not for every city. I am having trouble with cities in Asia, more specifically within China, Japan and Korea Could you help me with that?? Regards, Alejandra

  • @arvindshaker1984
    @arvindshaker1984 2 роки тому

    hi it was used full to me but it is not working on my excell
    pls give excel which is red to used

  • @swaaditya
    @swaaditya 3 роки тому

    The tool is great however, can we get the longitude and latitude automatically from bing maps or google maps? As, for all 1000 plus service locations we cannot manually input them right?

    • @HEMANTHHEMU86
      @HEMANTHHEMU86  3 роки тому +1

      If you mean getting coordinates from addresses, there are similar ways to do it. But it's accuracy is low.. i have observed it gets offset by 10-12 kms sometimes

    • @swaaditya
      @swaaditya 3 роки тому

      @@HEMANTHHEMU86 If thats the case then for each and every address there needs to be an input provided manually. Please share further insight by mailing me on swaaditya@gmail.com. I would be of great help as am trying to work on route optimization in my project as well

  • @uyenphamthithuuyen1903
    @uyenphamthithuuyen1903 2 роки тому

    Hi, your video is really helpful. However, I don't know how to obtain the longitude and latitude from Bing Maps. Can you create a video how to do that, please?

    • @filippomauro4846
      @filippomauro4846 2 роки тому +2

      in excel you can write the location in a cell (es. Rome), than select the cell that contain the location, go to data-->data types-->geography and extrapolate latitude and longitude clicking on small icon that appears next the location cell. In a third column you can use the function =concat(cell latitude, "," ,cell longitude) and you have the coordinate of location

  • @WaliSAQAR
    @WaliSAQAR 4 місяці тому

    Why we used this all it's all available in map when we enter two cities distance in map it's showing

  • @RafiqueNoorie
    @RafiqueNoorie 3 роки тому

    It is not mapping the distance which you was taken an another excel sheet2. How we can merge into excel sheet 1?

  • @yigityldz1089
    @yigityldz1089 Рік тому

    im getting a theres a problem with this formula error. Can you help me please

    • @yigityldz1089
      @yigityldz1089 Рік тому

      I solved, put ; instead of , on your getdistance formula.

  • @matinamoozadeh235
    @matinamoozadeh235 3 роки тому

    my excel shows the error Sub distMatrix does not define, what is the problem?

  • @renatobeltrame5403
    @renatobeltrame5403 2 роки тому +1

    Hi Hemanth! Thank you for sharing!! I have a few questions I think you could help. For the application in excel that I'm developping I need the distances to be showed in meters and with the most accuracy possible. Reading your code I understod that the distances are being calculated in miles and rounded to no decimals. Am I right? If your answer is yes, could you help me to do these adjustments? Thank you very much!

    • @renatobeltrame5403
      @renatobeltrame5403 2 роки тому +1

      Hi, it's me again! Reading the code with more attention I realized that you already converted the dimensions to meters and I changed de round rule. Thanks

  • @hasinrizwan5724
    @hasinrizwan5724 2 роки тому

    Great video brother, Very helpful for me... Can you tell how to convert this Excel data into numpy array?

  • @hakanyldz9977
    @hakanyldz9977 3 роки тому

    After you copy and paste key password on the cell B9 then automatically appeared word "KEY" on cell A9. How do it?

    • @HEMANTHHEMU86
      @HEMANTHHEMU86  3 роки тому +1

      It was not automatic.. i have written it in that cell.. i have fast forwarded the video at bit over thete

  • @13_pritamsanyal41
    @13_pritamsanyal41 8 місяців тому

    Hey, why the marix is not symmetric ?

  • @DAANoLOOF
    @DAANoLOOF 2 роки тому +1

    Hi Hemmath, is the distance calculated over the road or in a straight line? Either way, thank you for the tutorial!

    • @NathanaelHarwood
      @NathanaelHarwood Рік тому

      Just for others' sake - the description states 'It provides the road distance along the best routes considering traffic'

  • @SiBull
    @SiBull 2 роки тому

    How to get coordinate automatically trough excel?

  • @paulseiffert51
    @paulseiffert51 4 роки тому

    Hi, awesome Tool I used just yesterday and it worked perfectly! But the next day i opened excel and the took didnt Work anymore. I changed nothing. The Code is the same and the Formula also and the coordinates too. I build the same Tool again with a different Key and it still didnt Work..
    So you habe any ideas what happend?
    Maybe excel had an Update? Or Bing did?

    • @HEMANTHHEMU86
      @HEMANTHHEMU86  4 роки тому

      On top of my mind, i am guessing you saved the file as .xls instead of .xlsm.. is it the case?

    • @paulseiffert51
      @paulseiffert51 4 роки тому

      @@HEMANTHHEMU86 no i Saves it as .xlsm.. when i put the URL of you Code in Google it says the coordinates are in the wrong format but they are Not. They are the same as yesterday..

    • @HEMANTHHEMU86
      @HEMANTHHEMU86  4 роки тому

      @@paulseiffert51 if it's ok, mail the file to me at hemu161095@gmail.com . I'll try to see what's the anamoly.

    • @squares_music
      @squares_music 3 роки тому

      Hello :) Did you find a solution? I think I have the same problem and maybe your solution helps me too. Would be really nice :)

  • @sherifhassan1556
    @sherifhassan1556 3 роки тому

    Hemanth I hope you're well. This is an excellent tutorial, thank you. Unfortunately, I keep getting #NAME? error when running the GetDistance macro. Any suggestions? Thanks again. Syh

  • @rasraster
    @rasraster Рік тому

    Very nice, thank you. Can this be done with HTTPS instead of HTTP?

  • @SaurabhPratapiitkgp
    @SaurabhPratapiitkgp 4 роки тому

    How you are getting the source and destination coordinates

    • @HEMANTHHEMU86
      @HEMANTHHEMU86  4 роки тому

      Like i said in the video... I already have them. You can get the coordinates through the Bing maps API aswell.. but it isn't that effective. There are many open source websites with coordinates for each pin code. You can try that.

  • @subhendupradhan6475
    @subhendupradhan6475 4 роки тому

    it is throwing an error "invalid outside procedure". Please Help

  • @almemo9
    @almemo9 2 роки тому

    Juest amazing, you save me two days of work, just an small question, for big volume of data, the formula gives me #value message, any ideas? thanks in advance

  • @osamarizwan1635
    @osamarizwan1635 2 роки тому

    how can we get the distance in meters?

  • @giannacardenas6189
    @giannacardenas6189 4 роки тому

    Hi! This API has a limit of requests? I want to know if I can calculate the distance in a matrix 480x480 long 😬😬

    • @HEMANTHHEMU86
      @HEMANTHHEMU86  4 роки тому

      It has a limit of 1,25,000 requests. If you want to get 480*480, its better if you can write code for either upper half of matrix or the lower half only