MATLAB: How to evaluate the value of an expression

arrayfunctionlogical values

x = [-2:0.01:1];
f = (x.^2) -x +1 - (exp(-x));
x1 = -1.9;
f(x1)
this gives me the error:
Array indices must be positive integers or logical values
How can I manage to extract the right value of f at x1?
thanks!

Best Answer

Try this: 
f = @(x) (x.^2) -x +1 - (exp(-x));
x1 = -1.9;
fx1 =  f(x1)
creating an anonymous function and producing: 
fx1 = 
        -0.175894442279269
See the documentation section on Anonymous Functions for details.
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