topic Get an example function working in Intel® oneAPI Math Kernel Library

Get an example function working

Erasmo_Coletti — Fri, 19 Mar 2010 17:29:59 GMT

Hi,

I just loaded the Intel MKL library andI am trying to make an example work in C++. I copied the example from the web. The code I copied is as below:

//Example 2: Calling a Complex BLAS Level 1 Function from C++

#include "mkl.h"
typedef struct{ double re; double im; } complex16;

extern "C" void zdotc (complex16*, int *, complex16 *, int *, complex16 *, int *);

#define N 5

void test1()

{

int n, inca = 1, incb = 1, i;

complex16 a, b, c;

n = N;

for( i = 0; i < n; i++ ){

a.re = (double)i; a.im = (double)i * 2.0;

b.re = (double)(n - i); b.im = (double)i * 2.0;

}

zdotc(&c, &n, a, &inca, b, &incb );

printf( "The complex dot product is: ( %6.2f, %6.2f) ", c.re, c.im );

}

I get as an error : second C linkage of overloaded function 'zdotc' not allowed

Can somebody tell me/help me about why the above is not working?

Thank you for your help.

E.

Get an example function working

Todd_R_Intel — Sat, 20 Mar 2010 00:09:21 GMT

Could it be because the MKL header file already has the zdotc prototype and you define it again (slightly differently) in your example source? If you look in mkl_blas.h you'll see the following prototype:

void zdotc(MKL_Complex16 *pres, const MKL_INT *n, const MKL_Complex16 *x, const MKL_INT *incx, const MKL_Complex16 *y, const MKL_INT *incy);

Todd

Get an example function working

Erasmo_Coletti — Mon, 22 Mar 2010 11:00:32 GMT

Todd,

Thank u for ur response.
I could not get the above code to work, by the way its in Visual Studio 2008, I then decided to change a bit and try the below one:

#include "mkl.h"
extern "C" float sdot(const MKL_INT *n, const float *x, const MKL_INT *incx, const float *y, const MKL_INT *incy);

#define N 5

void test1()

{

MKL_INT n, inca = 1, incb = 1, i;

const float a = {1, 2, 3, 4, 5}, b = {6, 7, 8, 9, 10};

n = N;

sdot(&n, a, &inca, b, &incb);
printf( "The dot product is: ( %6.2f, %6.2f) ", n );

}

The error msg I get is:

mkl_intel_c.lib(_sdot.obj) : error LNK2019: unresolved external symbol _mkl_blas_sdot referenced in function _sdot

1>Release/XLStats.xll : fatal error LNK1120: 1 unresolved externals

Does anyboduy have an idea about how to fix it?

Thank you.

Get an example function working

Gennady_F_Intel — Tue, 23 Mar 2010 15:18:29 GMT

please add the required libraries to the Configuration Properties:

Linker\Input\Additional Dependencies:mkl_intel_c.lib mkl_intel_thread.lib mkl_core.lib libiomp5md.lib

as well add the path to the directory

Linker\General\Additional Libraries Directory:\ia32\lib\

where , as an example ==C:\Apps\Intel\MKL\10.2.4\ia32\lib\

--Gennady