firing angle for pulse generator in matlab

WE ARE STUDYING 120 O CONVERTER
Interval Transistor on period
0-60 T1,T6
60-120 T3,T6
120-180 T3,T2
180-240 T5,T2
240-300 T5,T4
300-360 T1,T4
PERIOD =1/50 = 0.02
PULSE WIDTH = (120*100)/360= 33.34%
Phase delay =(0.02*delay angle )/360
PHASE DELAY ARE AS FOLLOW
Sr No. Thyristor Phase delay Phase delay converted in (secs)
1 T1 0-60 0
2 T2 60-120 0.00334
3 T3 120-180 0.006667
4 T4 180-240 0.010000
5 T5 240-300 0.01334
6 T6 300-360 0.0166667
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[@bismasaif9886]

Literally the explanation I needed since the past week! This video made my day!!!!!!

[@saswotnepal8627]

how can i control the decrement of firing angle automatically from 180 to 0