How can one write a program to do this? (fminbnd)

I define a function

function out = test(x)
    y=x^2;
    z=y+1;
    out=z
end

Then I run

fminbnd(@(x) test(x),0,1)

This will return the value of x that maxes test(x). But I also want to output y at that optimal. How can one do this?

Answer 1

[Alan Weiss]

You can get the value of out = z simply by asking for it:

[xbest,out] = fminbnd(@(x) test(x),0,1)

See the fminbnd reference page.

Alan Weiss

MATLAB mathematical toolbox documentation

[alpedhuez]

Not z but y.

[Alan Weiss]

I am not sure what you want. You can calculate y separately in a function. Your function does not output y.

Alan Weiss

MATLAB mathematical toolbox documentation

[Steven Lord]

Define your test function to return two outputs, out and y. fminbnd will only ever call your function with one output. After fminbnd returns the "best x" call test with that best x as the input and two outputs.

[alpedhuez]

using breakpoints now.