matlab parfor with arrayfun (sliced variable) - matlab

Question

As the title says, I want to have a parfor loop with inside usage of arrayfun.
I created a minimal working example for the problem:
Having the following lines in a file called thisparfortest.m
function test=thisparfortest(countmax)
parfor count=1:countmax
test(count).nummer=count;
test(count).bisdrei=arrayfun(#(testnum)eq(test(count).nummer,testnum),1:3);
end
the command mcc('-e','-v','thisparfortest') results in
Compiler version: 4.18.1 (R2013a)
Error: File: **************\thisparfortest.m Line: 3 Column: 5
The variable test in a parfor cannot be classified.
See Parallel for Loops in MATLAB, "Overview".
Processing C:\Program Files\MATLAB\R2013a\toolbox\matlab\mcc.enc
Processing include files...
2 item(s) added.
Processing directories installed with MCR...
The file mccExcludedFiles.log contains a list of functions excluded from the CTF archive.
0 item(s) added.
Generating MATLAB path for the compiled application...
Created 43 path items.
Parsing file "****************\thisparfortest.m"
(Referenced from: "Compiler Command Line").
Parsing file "C:\Program Files\MATLAB\R2013a\toolbox\compiler\deploy\deployprint.m"
(Referenced from: "Compiler Command Line").
Parsing file "C:\Program Files\MATLAB\R2013a\toolbox\compiler\deploy\printdlg.m"
(Referenced from: "Compiler Command Line").
Unable to determine function name or input/output argument count for function
in MATLAB file "thisparfortest".
Please use MLINT to determine if this file contains errors.
Error using mcc
Error executing mcc, return status = 1 (0x1).
but as advised mlint thisparfortest (and also checkcode) returns no problems - like in the editor.
The loop can be done and compiled as a for loop.
Please do not ask for the sense of these commands - they are just here for the mwe.
I think, this should be reported to mathworks - or have I done something wrong?
Some additions:
When running
function retval=thisparfortest(countmax)
helpfun=#(x)arrayfun(#(testnum)eq(x,testnum),1:3);
parfor count=1:countmax
retval(count).nummer=count^2;
retval(count).bisdrei=helpfun(retval(count).nummer);
end
with only the for loop it works, but when using the shown version with parfor it results in
Error using thisparfortest>(parfor supply) (line 3)
Undefined function or variable "retval".
Error in thisparfortest (line 3)
parfor count=1:countmax
Caused by:
Undefined function or variable "retval"
Shouldn't that be caught by mlint/checkcode? This happens without compiler.

Answer 1

I don't believe the issue has anything to with compilation. When I attempt to run your code in regular MATLAB I get the same error that the variable test in a parfor cannot be classified.
There's no bug here - not every piece of code can be run inside a parfor loop, and it's not possible for MATLAB to perfectly determine prior to runtime which pieces can and can't. It tries to do a good job, and when it does, the Code Analyzer will tell you prior to runtime - but when it can't, it will give a runtime error as you've found.
Perhaps you can think of a way that MATLAB could have statically determined that this variable could not be classified - in that case this could be reported to MathWorks as an enhancement request to Code Analyzer.