Saving a matrix with a variable that could take any value
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Hi guys,
I would like to save a matrix, by where there is a variable that could take on any value. This is the matrix I would like to save and call up in any script at any time:
SM = [12/L^3 6/L^2 -12/L^3 6/L^2;
4/L -6/L^2 2/L 6/L^2;
-12/L^3 -6/L^2 12/L^3 -6/L^2;
2/L -6/L^2 4/L 6/L^2]
The variable in this case is 'L'.
How can I do this?
Many thanks!
采纳的回答
Either define the matrix as a function handle
SM = @(L)[12/L^3 6/L^2 -12/L^3 6/L^2;
4/L -6/L^2 2/L 6/L^2;
-12/L^3 -6/L^2 12/L^3 -6/L^2;
2/L -6/L^2 4/L 6/L^2];
SM(2)
or as a function
Lmat = matrix(2)
function Lmat = matrix(L)
Lmat = [12/L^3 6/L^2 -12/L^3 6/L^2;
4/L -6/L^2 2/L 6/L^2;
-12/L^3 -6/L^2 12/L^3 -6/L^2;
2/L -6/L^2 4/L 6/L^2];
end
If you save the function as "matrix.m" in your working directory, it can be called from any script at any time.
更多回答（1 个）
The matrix is undefined unless and until L is defined -- barring symbolic variable.
The easiest solution it would appear would be to create it as an anonymous function
SM = @(L)[12/L^3 6/L^2 -12/L^3 6/L^2;
4/L -6/L^2 2/L 6/L^2;
-12/L^3 -6/L^2 12/L^3 -6/L^2;
2/L -6/L^2 4/L 6/L^2];
L=1;
M=SM(L)
You can save/load SM at will to evaluate when needed with whatever L is needed...
L=pi;
M=SM(L)
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