how to embed matlab function simulink

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How to call this code in simulink while running as one of it's blocks
% intialization global Iref; global Increment; global Pold; Pold=0; Iref=4; Increment = -1;
function y = MPPtrackIref(P)
global Pold; global Iref; global Increment; IrefH = 5; IrefL =0; DeltaI = .02
if (P < Pold) Increment = - Increment; end
Iref = Iref + Increment*DeltaI
end
Pold = P; y = Iref;
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Accepted Answer

Azzi Abdelmalek
Azzi Abdelmalek on 5 Oct 2012
You don't need to use global variables, just use constant blocks and pass them through your matlab function

More Answers (4)

Kaustubha Govind
Kaustubha Govind on 5 Oct 2012
Edited: Kaustubha Govind on 5 Oct 2012
As explained in this previously asked question, it appears that you need to use global variables inside MATLAB Function blocks in conjunction with Data Store Memory blocks. If you really just mean to use those global variables as persistent memory, you should try:
function y = MPPtrackIref(P)
persistent Pold Iref Increment;
if isempty(Pold)
Pold=0; %initialized only once in the beginning
end
if isempty(Iref)
Iref=4; %initialized only once in the beginning
end
if isempty(Increment)
Increment = -1; %initialized only once in the beginning
end
IrefH = 5; IrefL =0; DeltaI = .02;
if (P < Pold)
Increment = - Increment;
end
Iref = Iref + Increment*DeltaI;
end
Pold = P;
y = Iref;

Julien
Julien on 5 Oct 2012
Hi, You can use the ' Matlab function ' block (found inside user-defined function library )
But this simple function can also be defined with usual simulinks block (with boolean test and unit delay blocks).
Why do you need to define your constants as global variable ?

mado
mado on 5 Oct 2012
I used matlab function but it gives me error , i can't write it in script file as it doesn't accept function and i can't write it in a function as it doesn't accept first declarations

mado
mado on 5 Oct 2012
how to pass them ??
  1 Comment
Azzi Abdelmalek
Azzi Abdelmalek on 5 Oct 2012
add a constant block and set a constant value to variable v (for example). in your m file or matlab command assign a value to your variable v

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