how to generate the switching pulses

Hello All, am working on a programme, where i should turn on a sequence of switches for a part of a switching duration,

Consider the switching frequency to be 50 kHz,

therefore Ts=1/Fs = 0.00002

now i divide the time into 3 parts Ta, Tb, To based on some condition such that Ts=Ta+Tb+To

now from t=0 to t=t+Ta/2 i have to turn on one set of switch, for the next duration that is from t+ta/2 to t+ta/2+tb/2 other set of switch should be on, like this 5 sequence is there , i have tried using for loop,

can anyone check my progrmme please.. please give the suggesstion if i can cut shot the programme

t=0;

if Region==1

for t=0:(t+Ta/2)

Sap=0

San=0

Sbp=0

Sbn=1

Scp=0

Scn=1

end

for t=(t+Ta/2):(t+Ta/2+Tb/2)

Sap=0

San=1

Sbp=0

Sbn=1

Scp=0

Scn=1

end

for t=(t+Ta/2+Tb/2):(t+Ta/2+Tb/2+To)

Sap=0

San=1

Sbp=1

Sbn=1

Scp=0

Scn=1

end

for t=(t+Ta/2+Tb/2+To):(t+Ta/2+Tb/2+To+Ta/2)

Sap=1

San=0

Sbp=0;

Sbn=0

Scp=1

Scn=0

end

for t=(t+Ta/2+Tb/2+To+Ta/2):(t+Ta/2+Tb/2+To+Ta/2+Tb/2)

Sap=0

San=0

Sbp=0

Sbn=0

Scp=1

Scn=0

end