Functions |
void | arm_mean_f32 (float32_t *pSrc, uint32_t blockSize, float32_t *pResult) |
| Mean value of a floating-point vector.
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void | arm_mean_q15 (q15_t *pSrc, uint32_t blockSize, q15_t *pResult) |
| Mean value of a Q15 vector.
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void | arm_mean_q31 (q31_t *pSrc, uint32_t blockSize, q31_t *pResult) |
| Mean value of a Q31 vector.
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void | arm_mean_q7 (q7_t *pSrc, uint32_t blockSize, q7_t *pResult) |
| Mean value of a Q7 vector.
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Description
Calculates the mean of the input vector. Mean is defined as the average of the elements in the vector. The underlying algorithm is used:
Result = (pSrc[0] + pSrc[1] + pSrc[2] + ... + pSrc[blockSize-1]) / blockSize;
There are separate functions for floating-point, Q31, Q15, and Q7 data types.
Function Documentation
void arm_mean_f32 |
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float32_t * |
pSrc, |
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uint32_t |
blockSize, |
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float32_t * |
pResult |
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) |
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- Parameters:
-
[in] | *pSrc | points to the input vector |
[in] | blockSize | length of the input vector |
[out] | *pResult | mean value returned here |
- Returns:
- none.
- Examples:
- arm_class_marks_example_f32.c.
void arm_mean_q15 |
( |
q15_t * |
pSrc, |
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uint32_t |
blockSize, |
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q15_t * |
pResult |
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) |
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- Parameters:
-
[in] | *pSrc | points to the input vector |
[in] | blockSize | length of the input vector |
[out] | *pResult | mean value returned here |
- Returns:
- none.
Scaling and Overflow Behavior:
- The function is implemented using a 32-bit internal accumulator. The input is represented in 1.15 format and is accumulated in a 32-bit accumulator in 17.15 format. There is no risk of internal overflow with this approach, and the full precision of intermediate result is preserved. Finally, the accumulator is saturated and truncated to yield a result of 1.15 format.
void arm_mean_q31 |
( |
q31_t * |
pSrc, |
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uint32_t |
blockSize, |
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q31_t * |
pResult |
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) |
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- Parameters:
-
[in] | *pSrc | points to the input vector |
[in] | blockSize | length of the input vector |
[out] | *pResult | mean value returned here |
- Returns:
- none.
Scaling and Overflow Behavior:
- The function is implemented using a 64-bit internal accumulator. The input is represented in 1.31 format and is accumulated in a 64-bit accumulator in 33.31 format. There is no risk of internal overflow with this approach, and the full precision of intermediate result is preserved. Finally, the accumulator is truncated to yield a result of 1.31 format.
void arm_mean_q7 |
( |
q7_t * |
pSrc, |
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uint32_t |
blockSize, |
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q7_t * |
pResult |
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) |
| |
- Parameters:
-
[in] | *pSrc | points to the input vector |
[in] | blockSize | length of the input vector |
[out] | *pResult | mean value returned here |
- Returns:
- none.
Scaling and Overflow Behavior:
- The function is implemented using a 32-bit internal accumulator. The input is represented in 1.7 format and is accumulated in a 32-bit accumulator in 25.7 format. There is no risk of internal overflow with this approach, and the full precision of intermediate result is preserved. Finally, the accumulator is truncated to yield a result of 1.7 format.