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Re: about logarithm in .cc files
From: |
Andy Buckle |
Subject: |
Re: about logarithm in .cc files |
Date: |
Wed, 5 Jan 2011 16:04:57 +0000 |
On Wed, Jan 5, 2011 at 3:21 PM, 时刻 <address@hidden> wrote:
>
> Hello all,
> I am working with Oct-Files, and encountering a problem, that is, how to
> write logarithm in .cc files. In .m files it is simple, i.e. log(x), here I
> set x to be a matrix. So how to do it in .cc files?
> Thanks
>
> Best regards,
The trick seems to be to make it into an octave_value first.
#include "octave/oct.h"
DEFUN_DLD (log, args, nargout,"") {
octave_value_list retval;
const int rows=3, cols=4;
dim_vector dv(rows,cols);
NDArray arr(dv);
double * pix_p=(double *)arr.fortran_vec();
for (uint32_t i=0; i<rows*cols ;i++) {
pix_p[i] = i;
}
octave_value arrval(arr);
return arrval.log();
}
--
/* andy buckle */