Problem with matlab function block.

I use a matlab function block in my simulink model and when i read a variable(for example N) from a file i get an error, but if i write N=2 it works fine. The problem is that i have to read this variable from a file. The error is : "Computed maximum size is not bounded. Static memory allocation requires all sizes to be bounded. The computed size is [:? x 1] Function 'MATLAB Function' : B=zeros(N,1,'double')". Any ideas are welcome. Thank you in advance.

Answer 1

[Kaustubha Govind]

The MATLAB Function block does not allow dynamic sizing of variables. The best you can do is figure out a maximum size for your variable, and then declare it as follows:

coder.varsize('B', [128 1]);
B = zeros(N, 1);

[Yanbo]

Hi Kaustubha,

Can coder.varsize be replaced by eml.varsize ? I am not quite sure about the difference between the two, and what toolbox shall I download to enable coder, as currently my matlab doesn't support coder.

Cheers,

Yanbo

Answer 2

[Walter Roberson]

You will need to allocate the memory first with a fixed maximum size, and then if you find that N is smaller than that size you can delete the extra storage from the array.