https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/How-to-compute-the-max-eigenvalue-of-one-real-matrix/m-p/1289943#M31508 <P>Hi,</P><P><BR /></P><P>Since we didn't hear back from you, we are closing this thread for now. If you require any additional assistance from Intel, please start a new thread. Any further interaction in this thread will be considered community only.</P><P><BR /></P><P>Have a Good day.</P><P> </P><P>Regards</P><P>Rajesh</P><BR /> Tue, 15 Jun 2021 09:34:19 GMT MRajesh_intel 2021-06-15T09:34:19Z https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/How-to-compute-the-max-eigenvalue-of-one-real-matrix/m-p/1205183#M29981 <P>How to compute the max eigenvalue of one real matrix? I only need the max eigenvalue, and best a function with fewer arguments in the calling sequence.</P> Sat, 29 Aug 2020 07:48:25 GMT https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/How-to-compute-the-max-eigenvalue-of-one-real-matrix/m-p/1205183#M29981 wang__ningning 2020-08-29T07:48:25Z https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/How-to-compute-the-max-eigenvalue-of-one-real-matrix/m-p/1208133#M30040 <P>Hello <A href="https://isvc.my.salesforce.com/one/one.app?#/sObject/a4l4U000000MWskQAG/view" rel="noopener noreferrer" target="_blank">wang__ningning</A>,</P><P><BR /></P><P>There are lots of functions to compute eigenvalue, for example ?sygvx can select eigenvalues by specifying either or range of indices for the desired eigenvalues. For more details please refer to the MKL developer reference: <A href="https://software.intel.com/content/www/us/en/develop/documentation/mkl-developer-reference-fortran/top/lapack-routines/lapack-least-squares-and-eigenvalue-problem-routines/lapack-least-squares-and-eigenvalue-problem-driver-routines/generalized-symmetric-definite-eigenvalue-problems-lapack-driver-routines/sygvx.html" target="_blank">https://software.intel.com/content/www/us/en/develop/documentation/mkl-developer-reference-fortran/top/lapack-routines/lapack-least-squares-and-eigenvalue-problem-routines/lapack-least-squares-and-eigenvalue-problem-driver-routines/generalized-symmetric-definite-eigenvalue-problems-lapack-driver-routines/sygvx.html</A></P><P><BR /></P><P>Regards,</P><P>Ruqiu</P><P><BR /></P><P><BR /></P><BR /> Thu, 10 Sep 2020 04:03:26 GMT https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/How-to-compute-the-max-eigenvalue-of-one-real-matrix/m-p/1208133#M30040 Ruqiu_C_Intel 2020-09-10T04:03:26Z https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/How-to-compute-the-max-eigenvalue-of-one-real-matrix/m-p/1208902#M30066 <P>Yeah, I know there are many functions for Fortran 95 to compute the eigenvalue of real matrix. But in my test, the syevd is the most fast function than other functions, such as the&nbsp;<SPAN>sygvx, which can&nbsp;select eigenvalues.&nbsp; So I want to konw which function is the most&nbsp;efficient to compute the&nbsp;eigenvalues?</SPAN></P> Sat, 12 Sep 2020 14:56:01 GMT https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/How-to-compute-the-max-eigenvalue-of-one-real-matrix/m-p/1208902#M30066 wang__ningning 2020-09-12T14:56:01Z https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/How-to-compute-the-max-eigenvalue-of-one-real-matrix/m-p/1285722#M31395 <P>&nbsp;Hello Wang_Ningning,</P> <P>Have you checked this function below in the developer reference for c<SPAN>omputing the largest/smallest eigenvalues and corresponding eigenvectors of a standard eigenvalue problem</SPAN>:</P> <P><A href="https://software.intel.com/content/www/us/en/develop/documentation/onemkl-developer-reference-c/top/extended-eigensolver-routines/extended-eigensolver-interfaces-for-extremal-eigenvalues-singular-values/extended-eigensolver-interfaces-to-find-largest-smallest-eigenvalues/mkl-sparse-ev.html" target="_blank" rel="noopener">mkl_sparse_?_ev (intel.com)</A></P> <P>&nbsp;</P> <P>and set the first i<SPAN style="font-family: inherit;">nput parameter "which" as:</SPAN></P> <DIV> <DIV>&nbsp;</DIV> <DIV> <DIV class="p"> <DIV>Indicates eigenvalues for which to search:</DIV> </DIV> <DIV> <UL> <LI class="li"> <DIV> <DIV class="p"> <DIV> <DIV>which = 'L'</DIV> <SPAN>&nbsp;</SPAN>indicates the largest eigenvalues.</DIV> </DIV> </DIV> </LI> <LI class="li"> <DIV> <DIV class="p"> <DIV> <DIV>which = 'S'</DIV> <SPAN>&nbsp;</SPAN>indicates the smallest eigenvalues.</DIV> </DIV> </DIV> </LI> </UL> </DIV> </DIV> </DIV> <P><LI-WRAPPER></LI-WRAPPER></P> Mon, 31 May 2021 01:22:18 GMT https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/How-to-compute-the-max-eigenvalue-of-one-real-matrix/m-p/1285722#M31395 Ruqiu_C_Intel 2021-05-31T01:22:18Z https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/How-to-compute-the-max-eigenvalue-of-one-real-matrix/m-p/1289943#M31508 <P>Hi,</P><P><BR /></P><P>Since we didn't hear back from you, we are closing this thread for now. If you require any additional assistance from Intel, please start a new thread. Any further interaction in this thread will be considered community only.</P><P><BR /></P><P>Have a Good day.</P><P> </P><P>Regards</P><P>Rajesh</P><BR /> Tue, 15 Jun 2021 09:34:19 GMT https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/How-to-compute-the-max-eigenvalue-of-one-real-matrix/m-p/1289943#M31508 MRajesh_intel 2021-06-15T09:34:19Z