Use Matrix element as function input
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Hi!
I have a 10x2 Matrix A, defined as A=R*T. Where R and T are also Matrices.
I have:
function [S] = myFunction(q,w)
S=[q 0 w 0 0;
w 0 0 q 0;
q w 0 0 0;
w 0 0 q 0;
0 0 0 w q];
q=A(1,1);
w=A(1,2);
The aim is for the function to take the (1,1) & (1,2) elements of the Matrix A and place them in the Matrix S. But I'm getting the error:
Undefined function or method 'A' for input arguments of type 'double'
Any help would be great. Thanks!
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Accepted Answer
Geoff Hayes
on 30 Dec 2014
Fred - I think the order of your operations is incorrect. If all of your above code (less the function signature) is in the body of the function, then the error messages makes sense since you are trying to reference the matrix A without it being passed into the function. I think that you want to do the following instead
function [S] = myFunction(A)
% now determine q and w
q=A(1,1);
w=A(1,2);
% initialize S
S=[q 0 w 0 0;
w 0 0 q 0;
q w 0 0 0;
w 0 0 q 0;
0 0 0 w q];
In the Command Window (or in your script), you would initialize A and then pass it as a parameter to your function, myFunction which would extract the values for q and w. Try the above and see what happens!
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