SumLn
Calculates the sum of natural logarithms of all elements in a vector.
The calculation formula is: 
.
The function interface declaration is as follows:
- Operations on floating-point numbers:
HmppResult HMPPS_SumLn_32f(const float* src, int32_t len, float* sum);
HmppResult HMPPS_SumLn_64f(const double* src, int32_t len, double* sum);
- Variable-length operations on floating-point numbers:
HmppResult HMPPS_SumLn_32f64f(const float* src, int32_t len, double* sum);
- Operations converting an integer to a floating-point number:
HmppResult HMPPS_SumLn_16s32f(const int16_t* src, int32_t len, float* sum);
Parameters
Parameter |
Description |
Value Range |
Input/Output |
|---|---|---|---|
src |
Pointer to the source vector |
The value cannot be NULL. |
Input |
len |
Vector length |
(0, INT_MAX] |
Input |
sum |
Pointer to the result |
The value cannot be NULL. |
Output |
Return Value
- Success: HMPP_STS_NO_ERR
- Failure: An error code is returned.
Error Codes
Error Code |
Description |
|---|---|
HMPP_STS_NULL_PTR_ERR |
The value of src or sum is NULL. |
HMPP_STS_SIZE_ERR |
The value of len is less than or equal to 0. |
Example
#define BUFFER_SIZE_T 10
void SumLnExample(void)
{
float src[BUFFER_SIZE_T] = {11.44, 0.07, 10.23, 8.78, 0.30, 1.72, 1.37, 3.39, 7.37, 7.40};
float dst = 0.00;
HmppResult result = HMPPS_SumLn_32f(src, BUFFER_SIZE_T, &dst);
printf("result = %d\n", result);
if (result != HMPP_STS_NO_ERR) {
return;
}
printf("dst = %.2f \n", dst);
}
Output:
result = 0 dst = 5954088960.00