MATLAB user defined function results in finite rise time

I am writing a behavioural code fo driving some setiches for a DC DC power converter. My code should produce (ideally) quasi squre waves (ie zero rise time) however during simulation its not the case.

Any help would be appreciated (regarding why this is happening and what can be done)

function [DIP1,DIP2,DN1,DN2,DOP1,DOP2,DOP3] = GATE_DRIVER(T,Tper) %T-real time, Tper- Period 
t=mod(T,Tper);DOP2=0;DOP3=0;
if(t<3e-5) %Ton
    DN2=1;
    DN1=0;
    DOP1=0;
    DIP1=1;
    DIP2=0; 
              
           
    
else        %Toff
    DIP1=0;
    DIP2=0;
    DN2=0;
    DN1=1;
    DOP1=1;
end 

Answer 1

[Anirudh Roy]

The problem was that the step size was not fixed, fo example T=[1e-5,2e-5,4-5......] so at 2e-5 the utput was 1 but at 4-5 it was zero (for one particaular signal) so MATLAB made a linear interpolation for 3e-5.

The soln is to speicfy the step size keeping this interpolation in mind.