Matlab Function Block reading erroneous values

Hello, I have the following problem with this block.

The code it's very simple:

function y = fcn(u,p) %#codegen

persistent f if isempty(f) f = 0; end

if p>90 f=1; y=0; else y=0; end

if f==1

    if p>60
      y=u;
    end

    if p<60
      y=0;
      f=0;
    end

 else
     y=0;
end

It has to wait until input (p) value is 90 to start doing the second if (where whatch that the value is higer than 60 or not.

p input is connected with a pressure sensor that starts from 60bar. The problem is that if I stop the simulation at the begining, p=148 or a higger value, and then it receives other aleatory values. Only if I wait to a long simulation, it starts (at 400seconds) to receives the true values that I can see on a scope.

I will be very grateful with any possible solution, thanks

Answer 1

[David Sanchez]

f changes value when p>90 and y=0 whatever happens to p, then, you go through a nested condition:

if f==1
if p>60
....
end
if p<60
...

but p>90.the second nested condition never applies.

Your function looks a bit incoherent. You should revise it carefully (sometimes a pen and paper approach helps a lot in following what your code will do).