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Diffstat (limited to 'DSP_Lib/Source/StatisticsFunctions/arm_std_f32.c')
| -rw-r--r-- | DSP_Lib/Source/StatisticsFunctions/arm_std_f32.c | 208 |
1 files changed, 0 insertions, 208 deletions
diff --git a/DSP_Lib/Source/StatisticsFunctions/arm_std_f32.c b/DSP_Lib/Source/StatisticsFunctions/arm_std_f32.c deleted file mode 100644 index c73c707..0000000 --- a/DSP_Lib/Source/StatisticsFunctions/arm_std_f32.c +++ /dev/null @@ -1,208 +0,0 @@ -/* ---------------------------------------------------------------------- -* Copyright (C) 2010-2014 ARM Limited. All rights reserved. -* -* $Date: 19. March 2015 -* $Revision: V.1.4.5 -* -* Project: CMSIS DSP Library -* Title: arm_std_f32.c -* -* Description: Standard deviation of the elements of a floating-point vector. -* -* Target Processor: Cortex-M4/Cortex-M3/Cortex-M0 -* -* Redistribution and use in source and binary forms, with or without -* modification, are permitted provided that the following conditions -* are met: -* - Redistributions of source code must retain the above copyright -* notice, this list of conditions and the following disclaimer. -* - Redistributions in binary form must reproduce the above copyright -* notice, this list of conditions and the following disclaimer in -* the documentation and/or other materials provided with the -* distribution. -* - Neither the name of ARM LIMITED nor the names of its contributors -* may be used to endorse or promote products derived from this -* software without specific prior written permission. -* -* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS -* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT -* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS -* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE -* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, -* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, -* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; -* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER -* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT -* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN -* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE -* POSSIBILITY OF SUCH DAMAGE. -* ---------------------------------------------------------------------------- */ - -#include "arm_math.h" - -/** - * @ingroup groupStats - */ - -/** - * @defgroup STD Standard deviation - * - * Calculates the standard deviation of the elements in the input vector. - * The underlying algorithm is used: - * - * <pre> - * Result = sqrt((sumOfSquares - sum<sup>2</sup> / blockSize) / (blockSize - 1)) - * - * where, sumOfSquares = pSrc[0] * pSrc[0] + pSrc[1] * pSrc[1] + ... + pSrc[blockSize-1] * pSrc[blockSize-1] - * - * sum = pSrc[0] + pSrc[1] + pSrc[2] + ... + pSrc[blockSize-1] - * </pre> - * - * There are separate functions for floating point, Q31, and Q15 data types. - */ - -/** - * @addtogroup STD - * @{ - */ - - -/** - * @brief Standard deviation of the elements of a floating-point vector. - * @param[in] *pSrc points to the input vector - * @param[in] blockSize length of the input vector - * @param[out] *pResult standard deviation value returned here - * @return none. - * - */ - - -void arm_std_f32( - float32_t * pSrc, - uint32_t blockSize, - float32_t * pResult) -{ - float32_t sum = 0.0f; /* Temporary result storage */ - float32_t sumOfSquares = 0.0f; /* Sum of squares */ - float32_t in; /* input value */ - uint32_t blkCnt; /* loop counter */ - -#ifndef ARM_MATH_CM0_FAMILY - - /* Run the below code for Cortex-M4 and Cortex-M3 */ - - float32_t meanOfSquares, mean, squareOfMean; - - if(blockSize == 1) - { - *pResult = 0; - return; - } - - /*loop Unrolling */ - blkCnt = blockSize >> 2u; - - /* First part of the processing with loop unrolling. Compute 4 outputs at a time. - ** a second loop below computes the remaining 1 to 3 samples. */ - while(blkCnt > 0u) - { - /* C = (A[0] * A[0] + A[1] * A[1] + ... + A[blockSize-1] * A[blockSize-1]) */ - /* Compute Sum of squares of the input samples - * and then store the result in a temporary variable, sum. */ - in = *pSrc++; - sum += in; - sumOfSquares += in * in; - in = *pSrc++; - sum += in; - sumOfSquares += in * in; - in = *pSrc++; - sum += in; - sumOfSquares += in * in; - in = *pSrc++; - sum += in; - sumOfSquares += in * in; - - /* Decrement the loop counter */ - blkCnt--; - } - - /* If the blockSize is not a multiple of 4, compute any remaining output samples here. - ** No loop unrolling is used. */ - blkCnt = blockSize % 0x4u; - - while(blkCnt > 0u) - { - /* C = (A[0] * A[0] + A[1] * A[1] + ... + A[blockSize-1] * A[blockSize-1]) */ - /* Compute Sum of squares of the input samples - * and then store the result in a temporary variable, sum. */ - in = *pSrc++; - sum += in; - sumOfSquares += in * in; - - /* Decrement the loop counter */ - blkCnt--; - } - - /* Compute Mean of squares of the input samples - * and then store the result in a temporary variable, meanOfSquares. */ - meanOfSquares = sumOfSquares / ((float32_t) blockSize - 1.0f); - - /* Compute mean of all input values */ - mean = sum / (float32_t) blockSize; - - /* Compute square of mean */ - squareOfMean = (mean * mean) * (((float32_t) blockSize) / - ((float32_t) blockSize - 1.0f)); - - /* Compute standard deviation and then store the result to the destination */ - arm_sqrt_f32((meanOfSquares - squareOfMean), pResult); - -#else - - /* Run the below code for Cortex-M0 */ - - float32_t squareOfSum; /* Square of Sum */ - float32_t var; /* Temporary varaince storage */ - - if(blockSize == 1) - { - *pResult = 0; - return; - } - - /* Loop over blockSize number of values */ - blkCnt = blockSize; - - while(blkCnt > 0u) - { - /* C = (A[0] * A[0] + A[1] * A[1] + ... + A[blockSize-1] * A[blockSize-1]) */ - /* Compute Sum of squares of the input samples - * and then store the result in a temporary variable, sumOfSquares. */ - in = *pSrc++; - sumOfSquares += in * in; - - /* C = (A[0] + A[1] + ... + A[blockSize-1]) */ - /* Compute Sum of the input samples - * and then store the result in a temporary variable, sum. */ - sum += in; - - /* Decrement the loop counter */ - blkCnt--; - } - - /* Compute the square of sum */ - squareOfSum = ((sum * sum) / (float32_t) blockSize); - - /* Compute the variance */ - var = ((sumOfSquares - squareOfSum) / (float32_t) (blockSize - 1.0f)); - - /* Compute standard deviation and then store the result to the destination */ - arm_sqrt_f32(var, pResult); - -#endif /* #ifndef ARM_MATH_CM0_FAMILY */ - -} - -/** - * @} end of STD group - */ |