|
arm_status | arm_mat_scale_f16 (const arm_matrix_instance_f16 *pSrc, float16_t scale, arm_matrix_instance_f16 *pDst) |
| Floating-point matrix scaling.
|
|
arm_status | arm_mat_scale_f32 (const arm_matrix_instance_f32 *pSrc, float32_t scale, arm_matrix_instance_f32 *pDst) |
| Floating-point matrix scaling.
|
|
arm_status | arm_mat_scale_q15 (const arm_matrix_instance_q15 *pSrc, q15_t scaleFract, int32_t shift, arm_matrix_instance_q15 *pDst) |
| Q15 matrix scaling.
|
|
arm_status | arm_mat_scale_q31 (const arm_matrix_instance_q31 *pSrc, q31_t scaleFract, int32_t shift, arm_matrix_instance_q31 *pDst) |
| Q31 matrix scaling.
|
|
Multiplies a matrix by a scalar. This is accomplished by multiplying each element in the matrix by the scalar. For example:
- Matrix Scaling of a 3 x 3 matrix
\[
\begin{pmatrix}
a_{1,1} & a_{1,2} & a_{1,3} \\
a_{2,1} & a_{2,2} & a_{2,3} \\
a_{3,1} & a_{3,2} & a_{3,3} \\
\end{pmatrix}
K =
\begin{pmatrix}
K a_{1,1} & K a_{1,2} & K a_{1,3} \\
K a_{2,1} & K a_{2,2} & K a_{2,3} \\
K a_{3,1} & K a_{3,2} & K a_{3,3} \\
\end{pmatrix}
\]
The function checks to make sure that the input and output matrices are of the same size.
In the fixed-point Q15 and Q31 functions, scale
is represented by a fractional multiplication scaleFract
and an arithmetic shift shift
. The shift allows the gain of the scaling operation to exceed 1.0. The overall scale factor applied to the fixed-point data is
scale = scaleFract * 2^shift.
◆ arm_mat_scale_f16()
Floating-point matrix scaling.
- Parameters
-
[in] | pSrc | points to input matrix |
[in] | scale | scale factor to be applied |
[out] | pDst | points to output matrix structure |
- Returns
- execution status
◆ arm_mat_scale_f32()
Floating-point matrix scaling.
- Parameters
-
[in] | pSrc | points to input matrix |
[in] | scale | scale factor to be applied |
[out] | pDst | points to output matrix structure |
- Returns
- execution status
◆ arm_mat_scale_q15()
Q15 matrix scaling.
- Parameters
-
[in] | pSrc | points to input matrix |
[in] | scaleFract | fractional portion of the scale factor |
[in] | shift | number of bits to shift the result by |
[out] | pDst | points to output matrix structure |
- Returns
- execution status
- Scaling and Overflow Behavior
- The input data
*pSrc
and scaleFract
are in 1.15 format. These are multiplied to yield a 2.30 intermediate result and this is shifted with saturation to 1.15 format.
◆ arm_mat_scale_q31()
Q31 matrix scaling.
- Parameters
-
[in] | pSrc | points to input matrix |
[in] | scaleFract | fractional portion of the scale factor |
[in] | shift | number of bits to shift the result by |
[out] | pDst | points to output matrix structure |
- Returns
- execution status
- Scaling and Overflow Behavior
- The input data
*pSrc
and scaleFract
are in 1.31 format. These are multiplied to yield a 2.62 intermediate result which is shifted with saturation to 1.31 format.