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SWIG update breaks passing float** from python to C
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nyk
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Joined: 28 Aug 2004
Posts: 527
Location: Bern (Switzerland)

PostPosted: Thu Mar 22, 2007 2:31 pm    Post subject: SWIG update breaks passing float** from python to C Reply with quote

I wrote a python module of C code using SWIG.
It works perfectly with swig 1.3.21, but not anymore with 1.3.25 or 1.3.31.

This is the C function being called looks like:
Code:

int *train(float **InVec, long nIV, long mIV, long maxcyc,int dim1,int dim2,float learnrate) {
// C code here, but not relevant for the error
}


This is the corresponding .i (swig) file:
Code:

%module foo
%include "carrays.i"
%array_class(int, intArray);
%{
int *train(float **InVec,long nIV,long mIV,long maxcyc,int dim1,int dim2,float learnrate);
%}
int *train(float **InVec,long nIV,long mIV,long maxcyc,int dim1,int dim2,float learnrate);


And this is how it's called from python:
Code:

import NumPtr,Numeric,foo
s,p,c,d1,d2,lr=10,10,100,10,10,0.1  # for example...
InVec=Numeric.zeros((s,p),Numeric.Float32) # org/pfam
# fill in some data here...
vP=NumPtr.getpointer(InVec) # Pointer to the 2D array
RetPt=kohonet.train(vP,s,p,c,d1,d2,lr) # Run C function


With swig 1.3.21 it works, but with 1.3.25, I get this unexplainable error:
Code:

Traceback (most recent call last):
...
    RetPt=foo.train(vP,samps,inps,samps2,cycs,d1,d2,lr) # Run C function
TypeError: argument number 1: a 'float **' is expected, 'str(_205dae0000000000_p_p_float)' is received


This is the error with 1.3.31:
Code:

Traceback (most recent call last):
...
    RetPt=foo.train(vP,samps,inps,samps2,cycs,d1,d2,lr) # Run C function
TypeError: in method 'train', argument 1 of type 'float **


Is this a bug in newer versions of SWIG, or am I doing something in a wrong way?
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alex.blackbit
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Joined: 26 Jul 2005
Posts: 2396

PostPosted: Fri Mar 23, 2007 12:21 am    Post subject: Reply with quote

i do not know what this 'str{....' thing means, but it does not really look like a pointer (address), or does it?
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nyk
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Joined: 28 Aug 2004
Posts: 527
Location: Bern (Switzerland)

PostPosted: Mon Mar 26, 2007 5:24 pm    Post subject: Reply with quote

What exactly do you mean? Is the following line in the SWIG interface not possible anymore in more recent versions of swig?
Code:

%{
int *train(float **InVec,long nIV,long mIV,long maxcyc,int dim1,int dim2,float learnrate);
%}
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