text: /* ----------------------------------------------------------------------
   * Project:      CMSIS DSP Library
   * Title:        arm_mat_trans_f64.c
   * Description:  Floating-point matrix transpose
   *
   * $Date:        18. March 2019
   * $Revision:    V1.6.0
   *
   * Target Processor: Cortex-M cores
   * -------------------------------------------------------------------- */
  /*
   * Copyright (C) 2010-2017 ARM Limited or its affiliates. All rights reserved.
   *
   * SPDX-License-Identifier: Apache-2.0
   *
   * Licensed under the Apache License, Version 2.0 (the License); you may
   * not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   * www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an AS IS BASIS, WITHOUT
   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  #include "edge-impulse-sdk/CMSIS/DSP/Include/dsp/matrix_functions.h"
  
  /**
    @ingroup groupMatrix
   */
  
  /**
    @defgroup MatrixTrans Matrix Transpose
  
    Tranposes a matrix.
  
    Transposing an <code>M x N</code> matrix flips it around the center diagonal and results in an <code>N x M</code> matrix.
    \image html MatrixTranspose.gif "Transpose of a 3 x 3 matrix"
   */
  
  /**
    @addtogroup MatrixTrans
    @{
   */
  
  /**
    @brief         Floating-point matrix transpose.
    @param[in]     pSrc      points to input matrix
    @param[out]    pDst      points to output matrix
    @return        execution status
                     - \ref ARM_MATH_SUCCESS       : Operation successful
                     - \ref ARM_MATH_SIZE_MISMATCH : Matrix size check failed
   */
  
  arm_status arm_mat_trans_f64(
    const arm_matrix_instance_f64 * pSrc,
          arm_matrix_instance_f64 * pDst)
  {
    float64_t *pIn = pSrc->pData;                  /* input data matrix pointer */
    float64_t *pOut = pDst->pData;                 /* output data matrix pointer */
    float64_t *px;                                 /* Temporary output data matrix pointer */
    uint16_t nRows = pSrc->numRows;                /* number of rows */
    uint16_t nCols = pSrc->numCols;                /* number of columns */
    uint64_t col, row = nRows, i = 0U;             /* Loop counters */
    arm_status status;                             /* status of matrix transpose */
  
  #ifdef ARM_MATH_MATRIX_CHECK
  
    /* Check for matrix mismatch condition */
    if ((pSrc->numRows != pDst->numCols) ||
        (pSrc->numCols != pDst->numRows)   )
    {
      /* Set status as ARM_MATH_SIZE_MISMATCH */
      status = ARM_MATH_SIZE_MISMATCH;
    }
    else
  
  #endif /* #ifdef ARM_MATH_MATRIX_CHECK */
  
    {
      /* Matrix transpose by exchanging the rows with columns */
      /* row loop */
      do
      {
        /* Pointer px is set to starting address of column being processed */
        px = pOut + i;
  
  #if defined (ARM_MATH_LOOPUNROLL)
  
        /* Loop unrolling: Compute 4 outputs at a time */
        col = nCols >> 2U;
  
        while (col > 0U)        /* column loop */
        {
          /* Read and store input element in destination */
          *px = *pIn++;
          /* Update pointer px to point to next row of transposed matrix */
          px += nRows;
  
          *px = *pIn++;
          px += nRows;
  
          *px = *pIn++;
          px += nRows;
  
          *px = *pIn++;
          px += nRows;
  
          /* Decrement column loop counter */
          col--;
        }
  
        /* Loop unrolling: Compute remaining outputs */
        col = nCols % 0x4U;
  
  #else
  
        /* Initialize col with number of samples */
        col = nCols;
  
  #endif /* #if defined (ARM_MATH_LOOPUNROLL) */
  
        while (col > 0U)
        {
          /* Read and store input element in destination */
          *px = *pIn++;
  
          /* Update pointer px to point to next row of transposed matrix */
          px += nRows;
  
          /* Decrement column loop counter */
          col--;
        }
  
        i++;
  
        /* Decrement row loop counter */
        row--;
  
      } while (row > 0U);          /* row loop end */
  
      /* Set status as ARM_MATH_SUCCESS */
      status = ARM_MATH_SUCCESS;
    }
  
    /* Return to application */
    return (status);
  }
  
  /**
   * @} end of MatrixTrans group
   */
  