MATLAB: Matlab (2010b) permute does not work for symbolic arrays

20072010bugdifferencepermutesymbolicversion

>> syms x y z u
>> A = [x y; z u];
>> A =
         [x    y]
         [      ]
         [z    u]
>> B = permute(A, [2 1]);
>> B =
         [x    y]
         [      ]
         [z    u]
However
>> B = A.'

works.

This is a problem for multidimensional symbolic arrays.

I know for a fact that permute works correctly with Matlab 2007b since I use both versions simultaneously.

What gives?

Best Answer

http://www.mathworks.com/support/bugreports/659647

Related Solutions

MATLAB: Permute in GPU

RESHAPE is very efficient, because it does not touch the data, but only the vector of dimensions. Therefore the computational costs of your procedure are optimal already, if the TRANSPOSE is programmed efficiently. A PERMUTE cannot be faster.

I'd expect, that süpecifying the dimension to operate on is helpful here: "fft(X,[],dim)". But I don't know, if this works with the GPU toolbox.

MATLAB: Curl with symbolic vector

The answer defined in this way:

syms Fx(x,y,z) Fy(x,y,z) Fz(x,y,z)
curl([Fx Fy,Fz],[x, y, z])

Result:

ans(x, y, z) =
 diff(Fz(x, y, z), y) - diff(Fy(x, y, z), z)
 diff(Fx(x, y, z), z) - diff(Fz(x, y, z), x)
 diff(Fy(x, y, z), x) - diff(Fx(x, y, z), y)

Best Answer

Related Solutions

MATLAB: Permute in GPU

MATLAB: Curl with symbolic vector

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