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CMSIS DSP library

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Vector Negate
Functions

Vector Negate
[Basic Math Functions]

Negates the elements of a vector. More...

Functions

void arm_negate_f32 (float32_t *pSrc, float32_t *pDst, uint32_t blockSize)
 Negates the elements of a floating-point vector.
void arm_negate_q15 (q15_t *pSrc, q15_t *pDst, uint32_t blockSize)
 Negates the elements of a Q15 vector.
void arm_negate_q31 (q31_t *pSrc, q31_t *pDst, uint32_t blockSize)
 Negates the elements of a Q31 vector.
void arm_negate_q7 (q7_t *pSrc, q7_t *pDst, uint32_t blockSize)
 Negates the elements of a Q7 vector.

Detailed Description

Negates the elements of a vector. 

        
     pDst[n] = -pSrc[n],   0 <= n < blockSize.

The functions support in-place computation allowing the source and destination pointers to reference the same memory buffer. There are separate functions for floating-point, Q7, Q15, and Q31 data types.

Function Documentation

void arm_negate_f32 ( float32_t *  pSrc,
float32_t *  pDst,
uint32_t  blockSize 
)

Negates the elements of a floating-point vector.

Parameters:
[in]*pSrcpoints to the input vector
[out]*pDstpoints to the output vector
[in]blockSizenumber of samples in the vector
Returns:
none.

Definition at line 74 of file arm_negate_f32.c.

void arm_negate_q15 ( q15_t *  pSrc,
q15_t *  pDst,
uint32_t  blockSize 
)

Negates the elements of a Q15 vector.

Parameters:
[in]*pSrcpoints to the input vector
[out]*pDstpoints to the output vector
[in]blockSizenumber of samples in the vector
Returns:
none.
Conditions for optimum performance
Input and output buffers should be aligned by 32-bit

Scaling and Overflow Behavior:

The function uses saturating arithmetic. The Q15 value -1 (0x8000) will be saturated to the maximum allowable positive value 0x7FFF.

Definition at line 68 of file arm_negate_q15.c.

void arm_negate_q31 ( q31_t *  pSrc,
q31_t *  pDst,
uint32_t  blockSize 
)

Negates the elements of a Q31 vector.

Parameters:
[in]*pSrcpoints to the input vector
[out]*pDstpoints to the output vector
[in]blockSizenumber of samples in the vector
Returns:
none.

Scaling and Overflow Behavior:

The function uses saturating arithmetic. The Q31 value -1 (0x80000000) will be saturated to the maximum allowable positive value 0x7FFFFFFF.

Definition at line 65 of file arm_negate_q31.c.

void arm_negate_q7 ( q7_t *  pSrc,
q7_t *  pDst,
uint32_t  blockSize 
)

Negates the elements of a Q7 vector.

Parameters:
[in]*pSrcpoints to the input vector
[out]*pDstpoints to the output vector
[in]blockSizenumber of samples in the vector
Returns:
none.

Scaling and Overflow Behavior:

The function uses saturating arithmetic. The Q7 value -1 (0x80) will be saturated to the maximum allowable positive value 0x7F.

Definition at line 65 of file arm_negate_q7.c.

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