Substituting numbers into a matrix with symbolic values

Question

Colin 2012-4-21

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/36110-substituting-numbers-into-a-matrix-with-symbolic-values

For my code, I set certain values like x, y , z to be symbolic at the beginning. I wanted to create a matrix with these in them, then later sub in values.

If I have a matrix currently in the form: [x+y; y+z; z+x; y+z]

How can I set it up to calculate each entry when x, y, and z are certain numerical values?

I tried a for loop such as:

for x = 1
for y = 2
for z = 3
[A] = [matrix of variables with symbolic variables]
end
end
end

but I just get a return of my symbolic matrix and not numerical values like I want.

Any suggestions or help? Thanks in advance

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Answer 1

Hossein 2012-4-21

0
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https://ww2.mathworks.cn/matlabcentral/answers/36110-substituting-numbers-into-a-matrix-with-symbolic-values#answer_45201

在 MATLAB Online 中打开

Is it possible to write a function that does that? like this:

function Amat=Amat(x,y,z)
Amat=[x+y;y+z;z+x;y+z]; 
end

now whenever you want you call Amat(1,2,3) and it returns the vector or matrix that you desire. The good thing is that you can later on pass the handle of your matrix (function) to another function. I hope this is what were looking for.