Re: [Rd] Strange behavior of C compiled program

From: Christophe Genolini <>
Date: Mon, 09 Feb 2009 10:05:36 +0100

Thanks, that was a stupid mistake (I did not know that this is so important).

So I still have a problem realy more complex and I do not know was is wrong. I am running a .C procedure in a R loop. After 4, 5 or sometimes 6 call to the C procedure, Rgui crash (it closes asking me if I want to send a report to Microsoft). Is there a debuger that can run the C code with some R in it ? And what kind of mistake can provoque such a crash ?


So I thaught that I find t
> On 08/02/2009 5:37 PM, Christophe Genolini wrote:
>> Hi the list,
>> I need to include some C code in R, but the behavior of the C code is
>> strange : Here is my code :
>> --- 8< ---
>> Rprintf("\n XXXX mTraj=%f
>> mClus=%f",mTraj[i+nbId*c],mClustersCenter[j+nbClusters*c]);
>> Rprintf("\nDistA=%d Tmp=%d",dist,tmp);
>> tmp = mTraj[i+nbId* c] - mClustersCenter [j+nbClusters* c];
>> Rprintf("\nDistB=%d Tmp=%d",dist,tmp);
>> dist += (tmp * tmp);
>> Rprintf("\nDistC=%d Tmp=%d",dist,tmp);
>> --- 8< ----
>> Herer are the stranges results it gives :
>> XXXX mTraj=1.000000 mClus=3.000000
>> DistA=0 Tmp=0
>> DistB=0 Tmp=0
>> DistC=0 Tmp=1074790400
>> I ask on a C chat, but no one can answer me.
>> Any idea of what wrong ?
> You likely have the wrong types for the variables you're printing. In
> C, the format has to match the type of the variable; if you use the
> wrong one, you get garbage.
> Duncan Murdoch
> mailing list Received on Mon 09 Feb 2009 - 09:09:34 GMT

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