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vcmaxmgsqval

Calculate the maximum modular square of complex vectors and perform index operations.

The function interface declaration is as follows:

Operations on numbers of the float type:

float (vsip_vcmaxmgsqval_f)(const vsip_cvview_f *a, uint64_t *j);

Parameters

Parameter

Description

Value Range

Input/Output

a

Pointer to the source complex vector

The value cannot be NULL.

Input

j

Pointer to the index variable

The value cannot be NULL.

Output

Abnormal Input

When a null pointer is input, the function directly returns a NaN value.

Example

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include "kvsip.h"
#include "vsip.h"
#include "vsip_type.h"

#define BUFFER_SIZE_T 10
void VcmaxmgsqvalExample()
{
    float src[BUFFER_SIZE_T] = {1.64f, 1.63f, -1.09f, 0.71f, -3.20f, -0.43f, 0.41f, -4.83f, 5.36f, -4.40f};
    int64_t stride = 1;
    int64_t cvLen = BUFFER_SIZE_T / 2;
    uint64_t offset = 0;
    uint64_t j = 0;

    vsip_cblock_f *block_a = vsip_cblockbind_f(src, NULL, cvLen, VSIP_MEM_NONE);

    vsip_cvview_f *a = vsip_cvbind_f(block_a, offset, stride, cvLen);
    vsip_cblockadmit_f(block_a, VSIP_TRUE);

    float dst = vsip_vcmaxmgsqval_f(a, &j);

    vsip_cvalldestroy_f(a);

    printf("src:\n");
    for (int32_t i = 0; i < cvLen; ++i) {
        printf("%.4f ", src[i * 2]);
        printf("%.4f    ", src[i * 2 + 1]);
    }
    printf("\nindex: %lu, dst: %.4f\n", j, dst);
}

int main(void) {
    VcmaxmgsqvalExample();
    return 0;
}

Output:

src:
1.6400 1.6300    -1.0900 0.7100    -3.2000 -0.4300    0.4100 -4.8300    5.3600 -4.4000
index: 4, dst: 48.0896