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2 mjames 1 
#include "ref.h"
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arm_status ref_mat_sub_f32(
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  const arm_matrix_instance_f32 * pSrcA,
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  const arm_matrix_instance_f32 * pSrcB,
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  arm_matrix_instance_f32 * pDst)
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{
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        uint32_t i;
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  uint32_t numSamples;                           /* total number of elements in the matrix  */
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        /* Total number of samples in the input matrix */
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        numSamples = (uint32_t) pSrcA->numRows * pSrcA->numCols;
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        for(i=0;i<numSamples;i++)
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        {
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                pDst->pData[i] = pSrcA->pData[i] - pSrcB->pData[i];
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        }
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        return ARM_MATH_SUCCESS;
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}
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arm_status ref_mat_sub_q31(
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  const arm_matrix_instance_q31 * pSrcA,
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  const arm_matrix_instance_q31 * pSrcB,
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  arm_matrix_instance_q31 * pDst)
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{
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        uint32_t i;
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  uint32_t numSamples;                           /* total number of elements in the matrix  */
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        /* Total number of samples in the input matrix */
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        numSamples = (uint32_t) pSrcA->numRows * pSrcA->numCols;
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        for(i=0;i<numSamples;i++)
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        {
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                pDst->pData[i] = ref_sat_q31( (q63_t)pSrcA->pData[i] - pSrcB->pData[i]);
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        }
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        return ARM_MATH_SUCCESS;
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}
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arm_status ref_mat_sub_q15(
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  const arm_matrix_instance_q15 * pSrcA,
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  const arm_matrix_instance_q15 * pSrcB,
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  arm_matrix_instance_q15 * pDst)
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{
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        uint32_t i;
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  uint32_t numSamples;                           /* total number of elements in the matrix  */
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        /* Total number of samples in the input matrix */
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        numSamples = (uint32_t) pSrcA->numRows * pSrcA->numCols;
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        for(i=0;i<numSamples;i++)
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        {
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                pDst->pData[i] = ref_sat_q15( (q31_t)pSrcA->pData[i] - pSrcB->pData[i]);
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        }
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        return ARM_MATH_SUCCESS;
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}