Hello everyone,

I'm new to C/C++. I'm trying to make a program that's going to use the CBLAS libraries that I downloaded on BLAS. After fighting tooth and nail with VC 2005 (I downgraded on purpose because at one point I was desperate.) with regards to solving compilation errors and such and eventually it all compiled just fine.

The problem now is, I get the above mentioned error. It says: "Unhandled exception at 0x0040271c in Try.exe: 0xC0000005: Access violation reading location 0x4e18feb8."

Now there are a few .cpp files (I'm compiling as C code.) which contain the functions and there is one other one which contains my main method. Using the debugger, it goes through 3 files all in all.

The main file:

Then, at cblas_dgemm we proceed to:Code:/* cblas_example2.c */ #include <stdio.h> #include <stdlib.h> #include "cblas.h" #include "cblas_f77.h" #define INVALID -1 int main (int argc, char **argv ) { int rout=-1,info=0,m,n,k,lda,ldb,ldc; double A[2] = {0.0,0.0}, B[2] = {0.0,0.0}, C[2] = {0.0,0.0}, ALPHA=0.0, BETA=0.0; printf("Checking if cblas_dgemm fails on parameter 11\n"); cblas_dgemm( CblasRowMajor, CblasNoTrans, CblasNoTrans, 0, 2, 2, ALPHA, A, 1, B, 1, BETA, C, 1 ); return 1; }

And finally to F77_dgemm which leads us to:Code:/* * * cblas_dgemm.c * This program is a C interface to dgemm. * Written by Keita Teranishi * 4/8/1998 * */ #include "cblas.h" #include "cblas_f77.h" void cblas_dgemm(const enum CBLAS_ORDER Order, const enum CBLAS_TRANSPOSE TransA, const enum CBLAS_TRANSPOSE TransB, const int M, const int N, const int K, const double alpha, const double *A, const int lda, const double *B, const int ldb, const double beta, double *C, const int ldc) { char TA, TB; #ifdef F77_CHAR F77_CHAR F77_TA, F77_TB; #else #define F77_TA &TA #define F77_TB &TB #endif #ifdef F77_INT F77_INT F77_M=M, F77_N=N, F77_K=K, F77_lda=lda, F77_ldb=ldb; F77_INT F77_ldc=ldc; #else #define F77_M M #define F77_N N #define F77_K K #define F77_lda lda #define F77_ldb ldb #define F77_ldc ldc #endif int CBLAS_CallFromC; int RowMajorStrg; RowMajorStrg = 0; CBLAS_CallFromC = 1; if( Order == CblasColMajor ) { if(TransA == CblasTrans) TA='T'; else if ( TransA == CblasConjTrans ) TA='C'; else if ( TransA == CblasNoTrans ) TA='N'; else { cblas_xerbla(2, "cblas_dgemm","Illegal TransA setting, %d\n", TransA); CBLAS_CallFromC = 0; RowMajorStrg = 0; return; } if(TransB == CblasTrans) TB='T'; else if ( TransB == CblasConjTrans ) TB='C'; else if ( TransB == CblasNoTrans ) TB='N'; else { cblas_xerbla(3, "cblas_dgemm","Illegal TransB setting, %d\n", TransB); CBLAS_CallFromC = 0; RowMajorStrg = 0; return; } #ifdef F77_CHAR F77_TA = C2F_CHAR(&TA); F77_TB = C2F_CHAR(&TB); #endif F77_dgemm(F77_TA, F77_TB, &F77_M, &F77_N, &F77_K, &alpha, A, &F77_lda, B, &F77_ldb, &beta, C, &F77_ldc); } else if (Order == CblasRowMajor) { RowMajorStrg = 1; if(TransA == CblasTrans) TB='T'; else if ( TransA == CblasConjTrans ) TB='C'; else if ( TransA == CblasNoTrans ) TB='N'; else { cblas_xerbla(2, "cblas_dgemm","Illegal TransA setting, %d\n", TransA); CBLAS_CallFromC = 0; RowMajorStrg = 0; return; } if(TransB == CblasTrans) TA='T'; else if ( TransB == CblasConjTrans ) TA='C'; else if ( TransB == CblasNoTrans ) TA='N'; else { cblas_xerbla(2, "cblas_dgemm","Illegal TransB setting, %d\n", TransB); CBLAS_CallFromC = 0; RowMajorStrg = 0; return; } #ifdef F77_CHAR F77_TA = C2F_CHAR(&TA); F77_TB = C2F_CHAR(&TB); #endif F77_dgemm(F77_TA, F77_TB, &F77_N, &F77_M, &F77_K, &alpha, B, &F77_ldb, A, &F77_lda, &beta, C, &F77_ldc); } else cblas_xerbla(1, "cblas_dgemm", "Illegal Order setting, %d\n", Order); CBLAS_CallFromC = 0; RowMajorStrg = 0; return; }

I get the above-mentioned exception in the last line, or:Code:/* * Written by D.P. Manley, Digital Equipment Corporation. * Prefixed "C_" to BLAS routines and their declarations. * * Modified by T. H. Do, 2/19/98, SGI/CRAY Research. */ #include <stdlib.h> #include "cblas.h" #include "cblas_test.h" #define TEST_COL_MJR 0 #define TEST_ROW_MJR 1 #define UNDEFINED -1 void F77_dgemm(int *order, char *transpa, char *transpb, int *m, int *n, int *k, double *alpha, double *a, int *lda, double *b, int *ldb, double *beta, double *c, int *ldc ) { double *A, *B, *C; int i,j,LDA, LDB, LDC; enum CBLAS_TRANSPOSE transa, transb; get_transpose_type(transpa, &transa); get_transpose_type(transpb, &transb); if (*order == TEST_ROW_MJR) { if (transa == CblasNoTrans) { LDA = *k+1; A = (double *)malloc( (*m)*LDA*sizeof( double ) ); for( i=0; i<*m; i++ ) for( j=0; j<*k; j++ ) A[i*LDA+j]=a[j*(*lda)+i]; } else { LDA = *m+1; A = ( double* )malloc( LDA*(*k)*sizeof( double ) ); for( i=0; i<*k; i++ ) for( j=0; j<*m; j++ ) A[i*LDA+j]=a[j*(*lda)+i]; } if (transb == CblasNoTrans) { LDB = *n+1; B = ( double* )malloc( (*k)*LDB*sizeof( double ) ); for( i=0; i<*k; i++ ) for( j=0; j<*n; j++ ) B[i*LDB+j]=b[j*(*ldb)+i]; } else { LDB = *k+1; B = ( double* )malloc( LDB*(*n)*sizeof( double ) ); for( i=0; i<*n; i++ ) for( j=0; j<*k; j++ ) B[i*LDB+j]=b[j*(*ldb)+i]; } LDC = *n+1; C = ( double* )malloc( (*m)*LDC*sizeof( double ) ); for( j=0; j<*n; j++ ) for( i=0; i<*m; i++ ) C[i*LDC+j]=c[j*(*ldc)+i]; cblas_dgemm( CblasRowMajor, transa, transb, *m, *n, *k, *alpha, A, LDA, B, LDB, *beta, C, LDC ); for( j=0; j<*n; j++ ) for( i=0; i<*m; i++ ) c[j*(*ldc)+i]=C[i*LDC+j]; free(A); free(B); free(C); } else if (*order == TEST_COL_MJR) cblas_dgemm( CblasColMajor, transa, transb, *m, *n, *k, *alpha, a, *lda, b, *ldb, *beta, c, *ldc ); else cblas_dgemm( UNDEFINED, transa, transb, *m, *n, *k, *alpha, a, *lda, b, *ldb, *beta, c, *ldc ); ; }

The debugger tells me what the address in the exception is the address if *ldc.Code:cblas_dgemm( UNDEFINED, transa, transb, *m, *n, *k, *alpha, a, *lda, b, *ldb, *beta, c, *ldc );

What am I doing wrong?

Any input will be greatly appreciated.

I apologise for the large amount of code, but I wanted to provide sufficient information and hopefully I've done that.

Thanks in advance.