Evaluate f(x) for multiple evenly spaced values

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Josh
Josh 2013-2-16
How do I evaluate a function f(x) for multiple, evenly spaced values of x between two variables. ie x = exactly 10 evenly spaced numbers between 5 and 20
I'm thinking define an anonymous function so I can evaluate it over a range of values but how to set those values is where I'm lost

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Shashank Prasanna
Shashank Prasanna 2013-2-16
x = linspace(5,20,10); % Generate 10 evenly spaced points between 5 and 20
y = f(x); % Call your function, assuming you have defined it already
%If f can't take in a vector you will have to call it in a loop.
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Youssef Khmou
Youssef Khmou 2013-2-16
Josh, to use mpower in your example, you must use elementwise :
f=@(x) x.^3-2*x.^2-3*x+1
x=linspace(5,20,10);
y=feval(f,x)
Image Analyst
Image Analyst 2013-2-16
编辑：Image Analyst 2013-2-16
Josh, you have to do y=f(x), not f(x)=y. The "target" variable is on the left, and the expression on the right is evaluated and stuffed into the variable on the left. This is how every programming language that I've used does it.

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Youssef Khmou
Youssef Khmou 2013-2-16
hi,
You can set the values using 'linspace' :
x=linspace(5,20,10);
f=@(x) sin(x)
y=feval(f,x);
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Youssef Khmou
Youssef Khmou 2013-2-16
linspace(a,b,n) generates a vector of n points linearly spaced between and including a and b .

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