problem using nonlin_residmin from optim

[bjrnp]

I am using a script in octave that uses the nonlinear_residmin function from
the optim package.
It always worked fine, but recently I am receiving the message:

error: 'nonlin_residim' undefined near line 15 column 23
error: called from
    Fit at line 15 column 22

from:

[p, residuals, cvg, outp]=nonlin_residim(f, init, x, y);

Copying the function code into the used script to avoid errors with optim
does not solve the problem.

I am currently running Octave v4.4.1 on Mac OS High Sierra installed via
Homebrew.
I installed the packages directly with Octave.

Does anyone have suggestions on what is going wrong?

Best regards,
Björn



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