https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/Find-sign-of-determinat/m-p/887625#M10115 <P>Iwant to find the sign of large matrix determinat. In a iterative dichotomic process, let find when the matrix becomes singular when the sign of determinant changes.</P> <P>Do you know some function of mkl to do this?</P> Sat, 06 Dec 2008 22:23:48 GMT ustatic 2008-12-06T22:23:48Z https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/Find-sign-of-determinat/m-p/887625#M10115 <P>Iwant to find the sign of large matrix determinat. In a iterative dichotomic process, let find when the matrix becomes singular when the sign of determinant changes.</P> <P>Do you know some function of mkl to do this?</P> Sat, 06 Dec 2008 22:23:48 GMT https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/Find-sign-of-determinat/m-p/887625#M10115 ustatic 2008-12-06T22:23:48Z https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/Find-sign-of-determinat/m-p/887626#M10116 <DIV style="margin:0px;"></DIV> <P><BR />Hello,</P> <P></P> <P>I'm afraid there's no easier way to know the sign of the determinant than to compute a determinant, which is equivalent to making LU decomposition.</P> <P>It would be difficult also to detect a singularity because of the rounding errors during computation. The result could be unpredictable atsingular or ill-conditioned matrix.</P> <P></P> <P>Michael.</P> Thu, 11 Dec 2008 16:56:40 GMT https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/Find-sign-of-determinat/m-p/887626#M10116 Michael_C_Intel4 2008-12-11T16:56:40Z