https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/What-is-the-purpose-of-pointerE-array-in-the-CSR-sparse-matrix/m-p/1203584#M29947 <P>Hi Eugene,</P> <P>The purpose of having pointerE is to allow working with a submatrix of a given sparse matrix. In other words, it allows the user to have a sparse matrix but use only a part of it in computations, essentially by skipping elements from the end of each row (being pointed to by pointerE[i], ... pointerB[row+1] in the column indices and values arrays).<BR />By having also a pointerB different from some general rowStart of a given matrix, the user can also skip some elememnts from the beginning of each row.</P> <P>Let us know if you have further questions.</P> <P><BR />Best,<BR />Kirill</P> Mon, 24 Aug 2020 18:51:47 GMT Kirill_V_Intel 2020-08-24T18:51:47Z https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/What-is-the-purpose-of-pointerE-array-in-the-CSR-sparse-matrix/m-p/1202109#M29926 <P>What is the purpose of pointerE array in the CSR sparse matrix format, if pointerB already contains enough information about start and end of a particular row?</P> <P>@<A href="https://software.intel.com/content/www/us/en/develop/documentation/mkl-developer-reference-c/top/appendix-a-linear-solvers-basics/sparse-matrix-storage-formats/sparse-blas-csr-matrix-storage-format.html" target="_blank">https://software.intel.com/content/www/us/en/develop/documentation/mkl-developer-reference-c/top/appendix-a-linear-solvers-basics/sparse-matrix-storage-formats/sparse-blas-csr-matrix-storage-format.html</A></P> Thu, 20 Aug 2020 13:50:58 GMT https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/What-is-the-purpose-of-pointerE-array-in-the-CSR-sparse-matrix/m-p/1202109#M29926 Eugene_Pavlov 2020-08-20T13:50:58Z https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/What-is-the-purpose-of-pointerE-array-in-the-CSR-sparse-matrix/m-p/1203584#M29947 <P>Hi Eugene,</P> <P>The purpose of having pointerE is to allow working with a submatrix of a given sparse matrix. In other words, it allows the user to have a sparse matrix but use only a part of it in computations, essentially by skipping elements from the end of each row (being pointed to by pointerE[i], ... pointerB[row+1] in the column indices and values arrays).<BR />By having also a pointerB different from some general rowStart of a given matrix, the user can also skip some elememnts from the beginning of each row.</P> <P>Let us know if you have further questions.</P> <P><BR />Best,<BR />Kirill</P> Mon, 24 Aug 2020 18:51:47 GMT https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/What-is-the-purpose-of-pointerE-array-in-the-CSR-sparse-matrix/m-p/1203584#M29947 Kirill_V_Intel 2020-08-24T18:51:47Z https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/What-is-the-purpose-of-pointerE-array-in-the-CSR-sparse-matrix/m-p/1206457#M30001 <P>This issue has been resolved and we will no longer respond to this thread.&nbsp;If you require additional assistance from Intel, please start a new thread.&nbsp;Any further interaction in this thread will be considered community only</P><BR /> Thu, 03 Sep 2020 16:06:04 GMT https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/What-is-the-purpose-of-pointerE-array-in-the-CSR-sparse-matrix/m-p/1206457#M30001 Gennady_F_Intel 2020-09-03T16:06:04Z