Simulink cannot propagate the variable-size mode from the input

My model have Matlab Embedded Fcn. It(MEF) have variable size output. The output connected to a Multiply block. When I run the model the bellow error appeared: Simulink cannot propagate the variable-size mode from the input "From1"(#) of "MMM/Subsystem/Embedded MATLAB Function2"(#18) to the input port 1 of 'example/MMM/Matrix Multiply3'. This input port expects a fixed-size mode. The variable-size mode originates from 'example/MMM/Subsystem/Embedded MATLAB Function2/ SFunction '. Examine the configurations of 'example/MMM/Matrix Multiply3' for one of the following scenarios: 1) the block does not support variable-size signals; 2) the block supports variable-size signals but needs to be configured for them.

It seems Multiply block do not accept variable size data. Help me to fix the problem.

Regards,

[Kaustubha Govind]

You need to look at the list of Simulink blocks that support variable-size signals and implement your model using one of those blocks.

Answer 1

[Will Forfang]

The key phrase in your error, i think, is this:

"2) the block supports variable-size signals but needs to be configured for them."

You can right-click the matlab function block, choose explore, and set its output to a "variable size" with upper and lower bounds on its dimension.

Then many blocks will accept it.

I created a custom function whose output dimensions depend on the value of the input:

function y = fcn(u)
y=ones(5); %this creates a 5x5 matrix of ones
if u>.5 
    y(2,:) = [];
end %The if statement removes the 2nd row of the output if the input>.5

I have this going into a "product" block and then to a "display" block. Both are working fine and I can see the dimensions of the output in the display changing with time. Here is a screenshot of the simulink model and the model explorer with circles around the parameters that you may need to adjust:

http://i.imgur.com/0bGCTzu.png

Hope this helps,

-Will

[Mehdi]

I did the same but that error persists. My matlab embedded Fcn: function y = fcn(u) %#eml y = zeros(u); http://upload.tehran98.com/img1/sclyplfdeaq2tf3uci3t.jpg take care I have used Matrix Multiply block not simple product. Actually I multiply the Matlab Embedded output by another matrix that comes from a constant block. Any comments?