---
title: rscvmul
description: "实数标量与复数向量乘法运算。"
url: https://www.hikunpeng.com/document/detail/zh/kunpengaccel/system-lib/ug-kvsip/kunpengaccel_kvsip_06_0061.html
sourcePath: /source/zh/kunpengaccel/system-lib/ug-kvsip/kunpengaccel_kvsip_06_0061.html
indexId: c7257f550003ac96cdfccd140b02086d93bbe03a142b42d33d26a4b0cbec865675
---
# rscvmul

实数标量与复数向量乘法运算。

函数接口声明如下：

float型函数的操作：

void (vsip_rscvmul_f)(float alpha, const vsip_cvview_f *b, const vsip_cvview_f *r);

#### 参数

| 参数名 | 描述 | 取值范围 | 输入/输出 |
| --- | --- | --- | --- |
| alpha | 运算实数标量。 | 不限 | 输入 |
| b | 指向源复数向量的指针。 | 非空 | 输入 |
| r | 指向目的复数向量的指针。 | 非空 | 输出 |


#### 异常输入

空指针输入时，函数直接返回。


#### 示例

```
#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 RscvmulExample()
{
    float alpha = 1.4f;
    float src[BUFFER_SIZE_T] = {-0.23f, 3.15f, -7.11f, 5.94f, 4.38f, 6.51f, -7.28f, -3.27f, 1.08f, 3.28f};
    float dst[BUFFER_SIZE_T];
    int64_t stride = 1;
    int64_t cvLen = BUFFER_SIZE_T / 2;
    uint64_t offset = 0;

    vsip_cblock_f *block_b = vsip_cblockbind_f(src, NULL, cvLen, VSIP_MEM_NONE);
    vsip_cblock_f *block_r = vsip_cblockbind_f(dst, NULL, cvLen, VSIP_MEM_NONE);

    vsip_cvview_f *b = vsip_cvbind_f(block_b, offset, stride, cvLen);
    vsip_cblockadmit_f(block_b, VSIP_TRUE);
    vsip_cvview_f *r = vsip_cvbind_f(block_r, offset, stride, cvLen);
    vsip_cblockadmit_f(block_r, VSIP_TRUE);

    vsip_rscvmul_f(alpha, b, r);

    vsip_cvalldestroy_f(b);
    vsip_cvalldestroy_f(r);

    printf("alpha: %.4f\n", alpha);
    printf("src2:\n");
    for (int32_t i = 0; i < cvLen; ++i) {
        printf("%.4f ", src[i * 2]);
        printf("%.4f    ", src[i * 2 + 1]);
    }
    printf("\ndst:\n");
    for (int32_t i = 0; i < cvLen; ++i) {
        printf("%.4f ", dst[i * 2]);
        printf("%.4f    ", dst[i * 2 + 1]);
    }
    printf("\n");
}

int main(void) {
    RscvmulExample();
    return 0;
}
```

运行结果：

```
alpha: 1.4000
src2:
-0.2300 3.1500    -7.1100 5.9400    4.3800 6.5100    -7.2800 -3.2700    1.0800 3.2800
dst:
-0.3220 4.4100    -9.9540 8.3160    6.1320 9.1140    -10.1920 -4.5780    1.5120 4.5920
```