Simulink Port Dimensions Error

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Learning 2022-11-22

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1858878-simulink-port-dimensions-error

评论： VBBV 2022-11-23

Hello everyone, new to Simulink. I have constant A (dimension is 7*7) multiplied by T (dimension is 1). I also have constant block B (size is 7*2) multiplied by an input block Y (dimensions is 2). I am using matrix multiplied for A*T and for B*Y. Equation therefore is M = A*T + B*Y. The using sum block to add them and output is M. The error is “Error in port widths or dimensions. Invalid dimension has been specified for input pot1” any help would be appreciated and even rules on setting the correct port dimensions would be appreciated.

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Answer 1

VBBV 2022-11-22

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https://ww2.mathworks.cn/matlabcentral/answers/1858878-simulink-port-dimensions-error#answer_1107568

编辑：VBBV 2022-11-22

在 MATLAB Online 中打开

M = A.*T + B*Y %

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VBBV 2022-11-22

在 MATLAB Online 中打开

A = randi([0 7],7,7)
A = 7×7
   7     6     1     1     4     0
   6     4     2     1     4     1
   1     7     5     6     4     0
   0     0     1     6     1     6
   2     6     7     1     2     4
   1     6     5     4     3     2
   5     5     2     0     5     1
T = randi(1);
B = randi([0 7],7,2)
B = 7×2
   4
   5
   7
   4
   3
   2
   4
Y = randi([0 2],2)
Y = 2×2
   2
   1
M1 = A*T   % 
M1 = 7×7
   7     6     1     1     4     0
   6     4     2     1     4     1
   1     7     5     6     4     0
   0     0     1     6     1     6
   2     6     7     1     2     4
   1     6     5     4     3     2
   5     5     2     0     5     1
M2 = B*Y  % 
M2 = 7×2
  12
   9
   9
  10
   5
   6
   4
M = [M1,M2]  % try this instead
M = 7×9
   7     6     1     1     4     0    12    12
   6     4     2     1     4     1     9     9
   1     7     5     6     4     0     9     9
   0     0     1     6     1     6    10    10
   2     6     7     1     2     4     5     5
   1     6     5     4     3     2     6     6
   5     5     2     0     5     1     4     4
M = A*T + B.*Y  %  this operation is not possible
Arrays have incompatible sizes for this operation.

Learning 2022-11-22

Thanks for your response! For some reason I am still getting an error that the size do not match. I tried reshaping Y which is a 2*1 matrix using Simulink block reshape.

VBBV 2022-11-23

在 MATLAB Online 中打开

Change the size of array Y from 2 x1 to 2 x7 as below

A = randi([0 7],7,7);
T = randi(1);
B = randi([0 7],7,2);
Y = randi([0 2],2,1) % change the size of Y  (by zero padding)
Y = 2×1
     1
     1
Y = [Y(1) 0 0 0 0 0 0;Y(2) 0 0 0 0 0 0] % change it 2 x 7 by adding zeros
Y = 2×7
     1     0     0     0     0     0     0
     1     0     0     0     0     0     0
M = A*T + B*Y  %  
M = 7×7
     5     7     4     6     7     6     4
     5     5     6     0     7     0     6
    13     5     6     3     4     6     1
    16     6     1     4     0     1     6
    14     7     0     7     1     3     0
    18     1     3     0     3     2     3
    10     3     4     3     5     3     7