Expected a scalar error

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Arkanra Kadhum
Arkanra Kadhum on 25 Feb 2019
Commented: Arkanra Kadhum on 25 Feb 2019
I used fun block in simulink with the following program
function [Y1, Y2,Y3] = selectionSort( Vc1, Vc2, Vc3)
A=[ Vc1, Vc2, Vc3];
B = sort(A) ;
B1=B(1);B2=B(2);B3=B(3);
Y1=0; Y2=0; Y3=0;
K1=find(A==B(1),1, 'first')
K2=find(A==B(2),1, 'first')
K3=find(A==B(3),1, 'first')
n=1
if n==1 && K1==1
Y1=1;Y2=0;Y3=0;Y4=0;Y5=0;Y6=0;Y7=0;Y8=0;Y9=0;Y10=0;
end
I get this error
Expected a scalar. Non-scalars are not supported in IF or WHILE statements, or with logical operators. Instead, use ALL to convert matrix logicals to their scalar equivalents. Function 'MATLAB Function' (#207.737.742), line 19, column 12: "K1==1"
Please I need your help to solve this problem
  4 Comments
Walter Roberson
Walter Roberson on 25 Feb 2019
Well, change the code to use all(K1==1) like it suggests. Sometimes you have to take some extra steps because Simulink's automatic checking is not as intelligent as humans are.
Arkanra Kadhum
Arkanra Kadhum on 25 Feb 2019
thank Roberson it is work

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Accepted Answer

Walter Roberson
Walter Roberson on 25 Feb 2019
Your code is too complex for MATLAB to be able to prove that all of the B values are certain to compare equal to part of A, so MATLAB has to assume that the find() can return empty.
By the way, some of the values can be empty, if there are nan in the inputs.
If the exercise is to implement selection sort, then you are unlikely to pass with that sort() call in your code. Might as well just call sort() with two outputs and use the returned indices.

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