---
title: SubC
description: "向量与常量相减。"
url: https://www.hikunpeng.com/document/detail/zh/kunpengboostkithistory/240RC1/accel/kunpengaccel_hmpp_06_0096.html
sourcePath: /source/zh/kunpengboostkithistory/240RC1/accel/kunpengaccel_hmpp_06_0096.html
indexId: a75783cc5f9bc6226b97f1a4d1416ab0408df05140552ca96c16ded43272c9c777
---
# SubC

向量与常量相减。

函数接口声明如下：

- 浮点数的操作：
  HmppResult HMPPS_SubC_32f(const float *src, float val, float *dst, int32_t len);

  HmppResult HMPPS_SubC_64f(const double *src, double val, double *dst, int32_t len);

  HmppResult HMPPS_SubC_32fc(const Hmpp32fc *src, Hmpp32fc val, Hmpp32fc *dst, int32_t len);

  HmppResult HMPPS_SubC_64fc(const Hmpp64fc *src, Hmpp64fc val, Hmpp64fc *dst, int32_t len);

- 整型数的缩放操作：
  HmppResult HMPPS_SubC_16s_S(const int16_t *src, int16_t val, int16_t *dst, int32_t len, double scale);

  HmppResult HMPPS_SubC_32s_S(const int32_t *src, int32_t val, int32_t *dst, int32_t len, double scale);

  HmppResult HMPPS_SubC_8u_S(const uint8_t *src, uint8_t val, uint8_t *dst, int32_t len, double scale);

  HmppResult HMPPS_SubC_16u_S(const uint16_t *src, uint16_t val, uint16_t *dst, int32_t len, double scale);

  HmppResult HMPPS_SubC_16sc_S(const Hmpp16sc *src, Hmpp16sc val, Hmpp16sc *dst, int32_t len, double scale);

  HmppResult HMPPS_SubC_32sc_S(const Hmpp32sc *src, Hmpp32sc val, Hmpp32sc *dst, int32_t len, double scale);

- 整型数的原址操作：
  HmppResult HMPPS_SubC_16s_I(int16_t val, int16_t *srcDst, int32_t len);

- 浮点数的原址操作：
  HmppResult HMPPS_SubC_32f_I(float val, float *srcDst, int32_t len);

  HmppResult HMPPS_SubC_64f_I(double val, double *srcDst, int32_t len);

  HmppResult HMPPS_SubC_32fc_I(Hmpp32fc val, Hmpp32fc *srcDst, int32_t len);

  HmppResult HMPPS_SubC_64fc_I(Hmpp64fc val, Hmpp64fc *srcDst, int32_t len);

- 整型数的原址缩放操作：
  HmppResult HMPPS_SubC_16s_IS(int16_t val, int16_t *srcDst, int32_t len, double scale);

  HmppResult HMPPS_SubC_32s_IS(int32_t val, int32_t *srcDst, int32_t len, double scale);

  HmppResult HMPPS_SubC_8u_IS(uint8_t val, uint8_t *srcDst, int32_t len, double scale)

  HmppResult HMPPS_SubC_16u_IS(uint16_t val, uint16_t *srcDst, int32_t len, double scale);

  HmppResult HMPPS_SubC_16sc_IS(Hmpp16sc val, Hmpp16sc *srcDst, int32_t len, double scale);

  HmppResult HMPPS_SubC_32sc_IS(Hmpp32sc val, Hmpp32sc *srcDst, int32_t len, double scale);


#### 参数

| 参数名 | 描述 | 取值范围 | 输入/输出 |
| --- | --- | --- | --- |
| src | 指向被减数的指针。 | 非空 | 输入 |
| val | 给定常数。 | 不限，视类型而定 | 输入 |
| dst | 指向目的向量的指针。 | 非空 | 输出 |
| srcDst | 指向原址操作向量的指针。 | 非空 | 输入/输出 |
| len | 向量长度。 | (0,INT\_MAX] | 输入 |
| scale | 缩放因数。 | (0, inf)且为2n | 输入 |


#### 返回值

- 成功：返回HMPP_STS_NO_ERR。
- 失败：返回错误码。


#### 错误码

| 错误码 | 描述 |
| --- | --- |
| HMPP\_STS\_NULL\_PTR\_ERR | src、dst、srcDst这几个入参中存在空指针。 |
| HMPP\_STS\_SIZE\_ERR | len小于或等于0。 |
| HMPP\_STS\_SCALE\_ERR | scale不在(0,INF)范围内或输入为NAN。 |


#### 示例

```
#define BUFFER_SIZE_T 10
void SubCExample(void)
{
float src[BUFFER_SIZE_T] = {10.29, 2.46, 10.88, 3.51, 10.72, 10.46, 2.85, 5.44, 7.68, 11.25};
float valTest = 8.51;
float dst[BUFFER_SIZE_T] = {0.00};
(void)HMPPS_Zero_32f(dst, BUFFER_SIZE_T);
HmppResult result = HMPPS_SubC_32f(src, valTest, dst, BUFFER_SIZE_T);
printf("result = %d\n", result);
if (result != HMPP_STS_NO_ERR) {
return;
}
printf("dst =");
for (int i = 0; i < BUFFER_SIZE_T; i++) {
printf(" %.2f", dst[i]);
}
printf("\n");
}
```

运行结果：

```
subC: result = 0.
dst = 1.78    -6.05    2.37    -5.00    2.21    1.95    -5.66    -3.07    -0.83    2.74
```