Re: How to check for availability of functions in core octave

[PhilipNienhuis]

bpabbott wrote:
> 
> On Jul 29, 2011, at 2:32 PM, PhilipNienhuis wrote:
> 
>> Is there a user-function for checking if some function is present in core
>> Octave?
>> Something like  
>>  isimplemented ("erfcx")
>> ?
>> 
>> I'm looking at pkg.m to see if some check can be implemented there to
>> skip
>> copying m-files for which equivalent (and probably better) functionality
>> is
>> in core octave. This is somewhat motivated by:
>> 
>>   http://sourceforge.net/mailarchive/message.php?msg_id=26792800
>> 
>> and some experiences with maintenance of octave-forge packages.
>> 
>> Philip
> 
> Does this do what you want?
> 
>>> isimplemented = @(fun) exist (strcat(fun,".m")) == 2 || exist (fun) > 2;
>>> isimplemented ("residue")
> ans =  1
>>> isimplemented ("erfcx")
> ans =  1
> 
> Ben
> 

Almost, Ben, a good first try, thanks.

But... your example also picks up functions in octave-forge:

octave.exe:4> isimplemented = @(fun) exist (strcat(fun,".m")) == 2 || exist
(fun) > 2
isimplemented =

@(fun) exist (strcat (fun, ".m")) == 2 || exist (fun) > 2

octave.exe:5> isimplemented ("residue")
ans =  1
octave.exe:6> isimplemented ("xls2oct")
ans =  1

(xls2oct.m is in the OF io package)

Even worse, it picks up OF functions shadowing core functions:

GNU Octave, version 3.4.2
Copyright (C) 2011 John W. Eaton and others.
This is free software; see the source code for copying conditions.
There is ABSOLUTELY NO WARRANTY; not even for MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  For details, type `warranty'.
<snip>
warning: function
C:\Programs\Octave\3.4.2\share\octave\packages\specfun-1.0.9\erfcx.m sha
dows a built-in function
:
<further down>
:
octave.exe:7> isimplemented ("erfcx")
ans =  1
octave.exe:8>


My question is really aimed at detecting stuff in core Octave, regardless of
whether it is shadowed or not (yes an extra requirement coming out of the
blue, now that there's something I could try).

Philip

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