Matlab: Put a sum into a function

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I would like to approximate numerical data by a function:

f = @(a0,xdata) a0(1).*xdata + ... + a0(n) .* xdata.^n

How can I do that, since a for loop does not work in a function? I know there is an internal polynomial function, but since I might want to extend the sum to non-integer exponents, I want to write my own function.

octave matlab function
1 Answers
f = @(a0,xdata) sum(a0 .* xdata.^(1:length(a0)));

If you insist on writing this as anonymous function, but I'd recommend writing this as a function on multiple lines with a function body:

function out = f(a0,xdata)
    exponents = 1:length(a0);
    out = sum(a0 .*xdata .^ exponents);
end
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