[Octave-bug-tracker] [bug #33935] demo function humps is not defined

[Nicholas Jankowski]

Follow-up Comment #2, bug #33935 (project octave):

saw this looking through old 'need infos'. (website sorts by type with oldest
first)

peeking at humps, it looks like a rational function which I've been playing
with recently. Used rational polynomial fit tool along with
humps([-10:.01:10]). Got a R2=1 fit with m=n=4. normalized coefficients with
Maxima and got the following:


f(x) = - (1200*x^4-2880*x^3+2036*x^2-348*x - 88) /
(200*x^4-480*x^3+406*x^2-138*x + 17)

Goodness of fit:
  SSE: 2.201e-24
  R-square: 1
  Adjusted R-square: 1
  RMSE: 3.324e-14


plot seems to overlap perfectly, too.

I remember 'way' back when using humps as a good test function with close
local maxima for peak finding, thought it may be useful to have. Since it
popped out so easily, thought I'd code it up.

1st cut m-file attached. not quite ready for a patch/submission yet. i think I
got all the use cases right.  need help/usage and tests. 

chalk it up to me procrastinating on other work by taking care of those 'high
priority' needs. ;)

(file #35722)
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Additional Item Attachment:

File name: humps.m                        Size:0 KB


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