.. SPDX-FileCopyrightText: 2019-2020 Intel Corporation .. .. SPDX-License-Identifier: CC-BY-4.0 .. _onemkl_lapack_potrf_scratchpad_size: potrf_scratchpad_size ===================== Computes size of scratchpad memory required for :ref:`onemkl_lapack_potrf` function. .. container:: section .. rubric:: Description ``potrf_scratchpad_size`` supports the following precisions. .. list-table:: :header-rows: 1 * - T * - ``float`` * - ``double`` * - ``std::complex`` * - ``std::complex`` Computes the number of elements of type ``T`` the scratchpad memory to be passed to :ref:`onemkl_lapack_potrf` function should be able to hold. Calls to this routine must specify the template parameter explicitly. potrf_scratchpad_size --------------------- .. container:: section .. rubric:: Syntax .. code-block:: cpp namespace oneapi::mkl::lapack { template std::int64_t potrf_scratchpad_size(sycl::queue &queue, oneapi::mkl::uplo upper_lower, std::int64_t n, std::int64_t lda) } .. container:: section .. rubric:: Input Parameters queue Device queue where calculations by :ref:`onemkl_lapack_potrf` function will be performed. upper_lower Indicates whether the upper or lower triangular part of :math:`A` is stored and how :math:`A` is factored: If ``upper_lower = oneapi::mkl::uplo::upper``, the array ``a`` stores the upper triangular part of the matrix :math:`A`, and the strictly lower triangular part of the matrix is not referenced. If ``upper_lower = oneapi::mkl::uplo::lower``, the array ``a`` stores the lower triangular part of the matrix :math:`A`, and the strictly upper triangular part of the matrix is not referenced. n Specifies the order of the matrix :math:`A` (:math:`0 \le n`). lda The leading dimension of ``a``. .. container:: section .. rubric:: Return Value The number of elements of type ``T`` the scratchpad memory to be passed to :ref:`onemkl_lapack_potrf` function should be able to hold. **Parent topic:** :ref:`onemkl_lapack-linear-equation-routines`