Error when using level 2 matlab s-function

I'm using simulink with system generator

I'm trying to write a level 2 s-function having as output 3 matrix of uniform random values (0 or 1)

I tried doing like this

for i=1:50

   block.OutputPort(1).Data(i)=randint;

   block.OutputPort(2).Data(i)=randint;

   block.OutputPort(3).Data(i)=randint;

end

and like this also

for i=1:50

   block.OutputPort(1).Data=randint(1,i,[0,1]);

   block.OutputPort(2).Data=randint(1,i,[0,1]);

   block.OutputPort(3).Data=randint(1,i,[0,1]);

end

and I have the same error

"Invalid assignment in 'PRNG/Level-2 MATLAB S-Function': attempt to assign a vector of width 2 to a vector of width 1"

Can you help me please

Thnks

Answer 1

[Walter Roberson]

Please show the output for

which -all randint

randint was obsoleted from the Communications Systems Toolbox starting in R2012a, and was removed a few releases later. When called in the syntax you are using it returned a single random value. I suspect that you are getting some third-party randint

[Ikram Jaouadi]

C:\Program Files\MATLAB\R2013a\toolbox\comm\commdeprecated\randint.m

when I used randint in a matlab function I got a true result

function qa = QProt(n)
 qa = zeros(1,n);
 for i=1:n
    qa=randint(1,i,[0,1]);
 end
end

[Walter Roberson]

Try running the loop in reverse, 50 down to 1. Remember that in acceleration mode, the first assignment to a variable determines the data type and size. You did not initialize to a vector of the final length so the first assignment to element 1 would set the size of the variable to be 1.

But my suggestion otherwise would be to use your second version except with just i=50 fixed instead of the for loop that assigns a random vector of length 1, overwrites that with a random vector of length 2, overwrites again with length 3 and so on.

[Ikram Jaouadi]

Thanks for your reply

I partially resolved the problem bye using this code

function Outputs(block)

x=block.InputPort(1).Data;

for i=1:x

   block.OutputPort(1).Data(i)=randint(1,1,[0,1]);

   block.OutputPort(2).Data(i)=randint(1,1,[0,1]);

   block.OutputPort(3).Data(i)=randint(1,1,[0,1]);

end

%end Outputs

But when running I see changing values before having a final matrix. it's like if the loop is executed in the display.