Evaluating a function defined by "sym" command

2013 11 19
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Hello
I am using "sym" command to define the variables in small expressions that form the elements of a matrix. Eventually i have to diagonalize the matrix to find eigenvalues. With sym command lets say i define -
f = a*x^2+b*x;
Now i want to evaluate the magnitude of 'f' by putting in numerical values for a,b and x. a and b are constants but x would be an array. How can define the values of a,b and x to find numerical answer for f under these circumstance?
Thanks

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Sean de Wolski
Sean de Wolski 2013-11-19

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Use subs:
syms a b x
f = a*x^2+b*x;
subs(f,{a,b,x},{1,2,magic(3)})
And for more info:
doc subs

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