Changing switching frequency doesnt work

Hello,

i have a simulink model of an electrical circuit. With the matlab function i control the mosfets of the cuircuit.

I use following code

persistent Zeit if isempty(Zeit) Zeit = 2;

if maximum == u1 && minimum == u3 if t<Zeit y1=1; y4=1; else y6=1; y7=1; end if t-Zeit ==2 Zeit=Zeit+4; end

not this works great. But when i want to higher the switching frequency by lowering the variable Zeit it doesnt switch any more

persistent Zeit if isempty(Zeit) Zeit = 0.025;

if maximum == u1 && minimum == u3 if t<Zeit y1=1; y4=1; else y6=1; y7=1; end if t-Zeit ==0.025 Zeit=Zeit+0.05; end

Hope someone can help me.

[Roger Wohlwend]

Please format your code so that it becomes more readable. And does the first piece of code work or does it not?