MATLAB: Do I receive a “subscripted index mismatch” error when I try to linearize a discrete model with negative real poles using Simulink Control Design 1.1 (R14SP1) and earlier

assignmentdimensiondiscretelinearizemismatchr14simulinksubscripted

I am trying to linearize a discrete model with negative real poles, using Simulink Control Design. However, I receive the following error message in a dialog box:

 Error using ==> linearize
 subscripted assignment dimension mismatch

Best Answer

This bug has been fixed in Simulink Control Design 1.2 (R14SP2) and additional rate conversion methods have been added. For earlier versions of Simulink, there are no known workarounds.

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MATLAB: “Subscripted assignment dimension mismatch”

This error occurs, much like the message tells you, when you try to put the wrong number (or shape) of items into an array. Here is a simple example:

H = zeros(6);
try
    H(:,1) = rand(2,3);  % Wrong shape.
catch
    fprintf('%s\n',lasterr)
end
try
    H(:,1) = rand(7,1);  % Wrong number.
catch
    fprintf('%s\n',lasterr)
end
H(:,1) = rand(6,1)  % Correct shape and number!

MATLAB: “Subscripted assignment dimension mismatch” error

Your code fails in this line:

LST(i)= n(i)+(1/15)*(-Long_rad)+E_solar_rad;

The problem is that the rigth side of the equation is a 1x365 array. If this is correct, you need to preallocate the variable LST out of the loop:

LST = NaT(length(n),length(E_solar_rad));

And then assign the value in the loop:

LST(i,:)= n(i)+(1/15)*(-Long_rad)+E_solar_rad;

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Related Solutions

MATLAB: “Subscripted assignment dimension mismatch”

MATLAB: “Subscripted assignment dimension mismatch” error

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