add a function to a model

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Néstor Monedero
Néstor Monedero 2011-11-3
Hi, I develop a function in matlab code:
function u = f(y)
if (u>0.8)
y=1;
elseif (u<0.8)
y=-1;
else
y=0;
where u is a random signal generate with the random number block. How can i join these two blocks? (random number and a block which contain my function without errors). I try using level-2 matlab s-function but it make error. can i use another block in which i introduce my matlab function code?
Thanks in advance. Néstor

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采纳的回答

Fangjun Jiang
Fangjun Jiang 2011-11-3
Use the "MATLAB Fcn" or "Fcn" block from library Simulink>User-Defined Functions.

更多回答（2 个）

Daniel Baboiu
Daniel Baboiu 2011-11-3
If a function is coded as function u = f(y), then y is the argument and u is the return value. Your block of code does it the other way around.
  1 个评论
Néstor Monedero
Néstor Monedero 2011-11-3
Sorry, the matlab function code is:
function y = fnc(u)
if(u<0.8)
y=-1;
elseif (u>0.8)
y=1;
else
y=0;
end

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Jon
Jon 2011-11-3
Have you tried using a 'MATLAB Function' block? Under 'User-Defined Functions'.
http://www.mathworks.com/help/toolbox/simulink/ug/f6-6010.html
u will be your input port and y will b your output port.

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