Substitute an array of number for a symbolic variable

Hi,

I have:

syms x y
f=x^3+y^3+3x^2+2y^2+9
fx=diff(f,x)

now, I'd like to substitute these two vectors of x and y values into the expression fx.

x=[1,2,3,4,5]

y=[6,7,8,9,10]

How do I do that with the subs command? If I can't do that with the subs command, what do you recommend?

David.

[Star Strider]

Question: Do you want a matrix with the function evaluation of fx for each value of (x,y) as an individual element?

What version of MATLAB do you have? Beginning with 2012a, symbolic functions are possible.

Answer 1

[Walter Roberson]

subs(fx, {x, y}, {[1,2,4,5,6}, [6,7,8,9,10]})

This syntax is documented relatively far down in the examples.

[Walter Roberson]

Joy Mondal comments

Thanks it works

Answer 2

[Azzi Abdelmalek]

syms x y 
f=x^3+y^3+3*x^2+2*y^2+9 
fx=diff(f,x)
x=[1,2,3,4,5]
y=[6,7,8,9,10]
eval(f)
eval(fx)