Re: MEX compilation problem---error: `xyz' undefined

[David Bateman]

Steve C. Thompson wrote:
> Dear Group,
>
> First, thanks for your help with
> http://www.cae.wisc.edu/pipermail/help-octave/2007-March/003476.html
>
> I now have 2.9.10 installed on my Ubuntu system.
>
> With David Bateman's help
> (http://www.cae.wisc.edu/pipermail/help-octave/2007-March/003475.html),
> I've compiled the MEX files from
> http://www.iterativesolutions.com/Matlab.htm .  After running
>
>   mkoctfile-2.9.10 -o Capacity.oct --mex Capacity.c
>
> and seeing Capacity.oct on the other end, with no apparent
> errors, a almost teared up.
>
> Unfortunately, the jubilation has transitioned to frustration, as
> is often the case.
>
> This is probably trivial (hopefully): issuing
>
>   a = CreateUmtsInterleaver (100)
>
> I get
>
>   error: `CreateUmtsInterleaver' undefined near line 1 column 5
>
> `CreateUmtsInterleaver' is a oct-file generated, like Capacity
> above, with:
>
>   mkoctfile-2.9.10 -o CreateUmtsInterleaver.oct --mex
> CreateUmtsInterleaver.c
>
> (I've commented out `matrix.h' in CreateUmtsInterleaver.c .)
> Running that command seems to work fine, no errors or warnings
> stated.  I fire up Octave in the directory where mkoctfile-2.9.10
> was ran, where the oct-file is, and:
>
>   octave-2.9.10:1> CreateUmtsInterleaver (100)
>   error: `CreateUmtsInterleaver' undefined near line 1 column 1
>
> I've tried chmod, 755 and 777.  Since the oct-file is in the
> working directory, I wouldn't think the path is an issue.  I use
> addpath anyways, to no avail.
>
> Either:
>
>   1) I'm missing something trivial (hopefully), or
>   2) something is wrong with my compilation process of the MEX
>      file.
>
> Please note, I've read through
> http://www.nabble.com/Help-on-error:-can't-perform-indexing-t3227971.html
> , and don't think that has anything to do with my problem.  In
> case 2) is at issue, I've pasted CreateUmtsInterleaver.c below.
> Also note, I'm getting this same problem with the oct-files I
> compiled!
>   
Yeah, there is a bug in cml 1.6.3 is source/include/interleaver.h and I
have no idea how this compiled with Matlab either. I suspect probably no
one even tried as cml 1.6.3 supplies the windows versions of the mex
files pre built.. I attach a patch that fixes cml 1.6.3 and together
with the script

<quote>
#! /bin/sh -f
files=`find . -name "*.c"`

for _file in $files; do
  _newfile=`echo ${_file} | sed -e "s/\.c$/_new.c/"`
  _outfile=`echo ${_file} | sed -e "s/\.c$/.oct/"`
  echo "Build $_file"
  cat $_file | sed -e 's/#include <matrix.h>//' > $_newfile
  mkoctfile -o $_outfile --mex $_newfile
  rm $_newfile
done
rm *.o
</quote>

Allows compilation of all of the mex code under Octave 2.9.10.. Running
your example under octave 2.9.10 then gives

octave:1> a = CreateUmtsInterleaver (100)
r[0] = 17
r[1] = 13
r[2] = 11
r[3] = 7
r[4] = 1
a =

 Columns 1 through 16:

   99   61   41   21    1   82   74   55   23   10   84   66   56  
29    5   88

 Columns 17 through 32:

   68   52   28   12   96   77   49   25    6   93   70   42   35    3  
87   67

<snip>

It seems there is some spurious output as the "r[0]" values are printed
independent of the presence of absence of a ";". I've cc'ed this to the
cml maintainer, and hopefully the fix might be included in version 1.6.4 :-)

Cheers
David

-- 
David Bateman                                address@hidden
Motorola Labs - Paris                        +33 1 69 35 48 04 (Ph) 
Parc Les Algorithmes, Commune de St Aubin    +33 6 72 01 06 33 (Mob) 
91193 Gif-Sur-Yvette FRANCE                  +33 1 69 35 77 01 (Fax) 

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--- source/include/interleaver.h~       2007-01-28 20:27:50.000000000 +0100
+++ source/include/interleaver.h        2007-03-30 10:14:44.451458946 +0200
@@ -285,7 +285,7 @@
                                IntraMatrix[(RR-1)+RR*pValue]=itemp;
                        }
                } else {
-                       for (j=0;j<=pValue-2;j++) {*/
+                       for (j=0;j<=pValue-2;j++) {
                                index = s[ (j*r[i])%(pValue-1) ] - 1;
                                IntraMatrix[ i+j*RR ] = Matrix[ i+index*RR ];
                        }
@@ -332,4 +332,4 @@
        free( r );
 
 }
-       
\ No newline at end of file
+