OK coming up to speed now.  So the wiki isn't the official package docs, and even the package doc link there is broken, when it should point to
https://octave.sourceforge.io/parallel/4.0.2/package_doc/

I don't know where or how that examples document was sourced, and if it can be updated, but I've cc'd the package maintainer.

A fair point. I have reopened the report and changed it to the documentation group.  The example is on the wiki so it’s easy enough to change if you havesuggestions for correction.

Glad you were able to figure it out and thanks for the follow-up report.  

Adjusting title and closing bug report. It can be reopened if we think that it’s worth keeping the inline function limitation issue as an active task to figure out how to address.

I am testing the pararrayfun function of the parallel package using the official example at this link: https://wiki.octave.org/wiki/images/e/e9/Examples_of_how_to_use_parrarrayfun.pdf

When running the code, I get the following error:

could not save variable.
error: 'myfun' undefined near line 1 column 6
execution error
error: __parcellfun_get_next_result__: could not receive result

The code I am testing is this one (taken from the aforementioned example):

# In this script 4 ways of calculating the values of a one-dimensional function
# are compared, the time taken by each way is measured and it is verified that
# there are no discrepancies in the results.
pkg load parallel

nmax = 10000; # Number of points where the function is calculated

function [a,b] = myfun(n); # Function used in this test
  a = pi*(n-2)/n;
  f = @(x) (cos(x).^n + sin(x).^(n-1));
  b = quadgk(f,0,a);
endfunction

# Fist method, using a for loop, defining the function to calculate
# within the loop.
tic
for n = 1:nmax;
  a1(n) = pi*(n-2)/n;
  b1(n) = quadgk(@(x) (cos(x).^n + sin(x).^(n-1)),0,a1(n));
endfor
t1 = toc

# Second method, using a for loop and calling "myfun"
tic
for n = 1:nmax
  [a2(n),b2(n)] = myfun(n);
endfor
t2= toc

# Third method, using arrayfun to call "myfun"
tic
ni = 1:nmax;
[a3,b3] = arrayfun("myfun",ni);
t3 = toc

# Forth method, using parrayfun to call "myfun"
tic
ni = 1:nmax;
[a4,b4] = pararrayfun(4,@(n) myfun(n),ni);
t4 = toc

# Are discrepancies in the results?
discrepancies_1 = max(a2-a1) + max(b2-b1) + max(a3-a1)
discrepancies_2 = max(b3-b1) + max(a4-a1) + max(b4-b1)

System info in the attached image ("system_info.png").