Multiplying two matrices with completely different dimensions

Maja Bernstorff

2018 2 8

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Hi everybody. I've programmed the following code:

[X,Y,Z]=meshgrid(0:.1:10);
B=[0.0184 0 0; 0 00.0546 0; 0 0 0.0248];
p = densitet(X,B);
function p = densitet(U, B)
p =((det(inv(B))/(8.*pi.^3)).^(0.5))*exp(-0.5*transpose(U).*inv(B).*U) ;
end

Now it gives the following errors:

Error using .' Transpose on ND array is not defined. Use PERMUTE instead.

Error in Try>densitet (line 17) p =((det(inv(B))/(8.*pi.^3)).^(0.5))*exp(-0.5*transpose(U).*inv(B).*U) ;

Error in Try (line 13) p = densitet(X,B);

Can anybody help my fix the code, so that it works?

Edit: I may need to clarify that I want my function p to work on the whole meshgrid - if that makes sense.

Thanks in advance!

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Birdman 2018-2-8

The solution is obvious. You can change your B matrix :)

Adam 2018-2-8

Before thinking how to do it in Matlab you should ask yourself what you expect the answer to be and whether it even makes sense in theory. what do you expect the result to be of multiplying a 101x101x101 array by a 3x3 array?

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