Multiplication matrix with strings

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PANAGIOTIS
PANAGIOTIS 2023-2-21
编辑： Star Strider 2023-2-21
how can i multiply matrices with strings, for example [k1-2*m,-k2;-k2,k2]*[1,2;4,6]
  1 个评论
Luca Ferro
Luca Ferro 2023-2-21
编辑：Luca Ferro 2023-2-21
syms k1 k2 m
mult=[k1-2*m,-k2;-k2,k2].*[1,2;4,6]
You need to create symbolic variables before using them.
I'm not sure if you just want to multiply them or element wise multiply them. I decided in my code to element wise multiply them

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Star Strider
Star Strider 2023-2-21
编辑：Star Strider 2023-2-21
Ran in:
Perhaps this —
syms k1 k2 m
M = [k1-2*m,-k2;-k2,k2]*[1,2;4,6] % Symbolic Expression
M = 
Mfcn = matlabFunction(M) % Create Numeric Function From It
Mfcn = function_handle with value:
@(k1,k2,m)reshape([k1-k2.*4.0-m.*2.0,k2.*3.0,k1.*2.0-k2.*6.0-m.*4.0,k2.*4.0],[2,2])
Result = Mfcn(10,20,30)
Result = 2×2
-130 -220 60 80
The ‘M’ expression will work in a symbolic context, and ‘Mfcn’ can be used in non-symbolic (numeric) MATLAB code.
EDIT — Added ‘Result’ as a demonstration.
.

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