Use entries of symbolic array outside of the array

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Tobias Ohrmann
Tobias Ohrmann 2020-3-28
评论： Tobias Ohrmann 2020-3-28
I have defined a matrix of symbolic variables via
X=sym(x,[8,24]);
When I now type x5_24 for instance, MATLAB still says "Unrecognized function or variable x5_24". Why? I need to use the variable entries outside of the matrix X.

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Star Strider
Star Strider 2020-3-28
The reason is that the elements of ‘X’ are stored as matrix elements. The individual elements exist only as matrix elements, not as individual, named variables:
syms x
X=sym('x',[8,24]);
Q = X(5,24)
produces:
Q =
x5_24
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Tobias Ohrmann
Tobias Ohrmann 2020-3-28
Its a bit complicated, I transported the matrix X to Mathematica, did something with it there and got a new matrix with variables xi_j, which I now want to transport back to MATLAB. So appareantly this was a bad idea..

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