calculate the matrix when there are x and y as variables

Assuming i have a matrix that looks like that :

A=[3*x^2+5*y+7 6*x+y^3 ; x^3-7*y 1/y+4*x-5]

If x=3 and y=1

how can i calculate the value of matrix A ?

I have a license to symbolic

Appreciate support

thanks in advance

Yossi

Answer 1

[Voss]

You have it already:

x=3;
y=1;
A=[3*x^2+5*y+7    6*x+y^3  ; x^3-7*y   1/y+4*x-5]

A = 2×2

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Or, if you want to use the Symbolic Math Toolbox:

syms x y
A=[3*x^2+5*y+7    6*x+y^3  ; x^3-7*y   1/y+4*x-5]

A = 

result = subs(A,[x,y],[3,1])

result = 

[Torsten]

Or define A as a function:

A = @(x,y)[3*x^2+5*y+7    6*x+y^3  ; x^3-7*y   1/y+4*x-5];
A(3,1)

ans = 2×2

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