Multiplication matrix with strings

how can i multiply matrices with strings, for example [k1-2*m,-k2;-k2,k2]*[1,2;4,6]

[Luca Ferro]

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

Answer 1

[Star Strider]

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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