---
title: NormDiff
description: "两个向量差值的1范数（L1）、2范数（L2）或∞范数（Inf）。计算公式如下："
url: https://www.hikunpeng.com/document/detail/zh/kunpengboostkithistory/240RC1/accel/kunpengaccel_hmpp_06_0084.html
sourcePath: /source/zh/kunpengboostkithistory/240RC1/accel/kunpengaccel_hmpp_06_0084.html
indexId: 75c3bc41bdbb2f212e11ad9ca7efe20df0d9ddacdabfeafb81ad150a792f4c3577
---
# NormDiff

两个向量差值的1范数（L1）、2范数（L2）或∞范数（Inf）。计算公式如下：

- L1范数
- L2范数
- ∞范数

函数接口声明如下：

- L1范数：
  HmppResult HMPPS_NormDiff_L1_32f(const float* src1, const float* src2, int32_t len, float* norm);

  HmppResult HMPPS_NormDiff_L1_64f(const double* src1, const double* src2, int32_t len, double* norm);

  HmppResult HMPPS_NormDiff_L1_16s32f(const int16_t* src1, const int16_t* src2, int32_t len, float* norm);

  HmppResult HMPPS_NormDiff_L1_32fc64f(const Hmpp32fc* src1, const Hmpp32fc* src2, int32_t len, double* norm);

  HmppResult HMPPS_NormDiff_L1_64fc64f(const Hmpp64fc* src1, const Hmpp64fc* src2, int32_t len, double* norm);

- 有缩放的L1范数：
  HmppResult HMPPS_NormDiff_L1_16s32s_S(const int16_t* src1, const int16_t* src2, int32_t len, int32_t* norm, double scale);

  HmppResult HMPPS_NormDiff_L1_16s64s_S(const int16_t* src1, const int16_t* src2, int32_t len, int64_t* norm, double scale);

- L2范数：
  HmppResult HMPPS_NormDiff_L2_32f(const float* src1, const float* src2, int32_t len, float* norm);

  HmppResult HMPPS_NormDiff_L2_64f(const double* src1, const double* src2, int32_t len, double* norm);

  HmppResult HMPPS_NormDiff_L2_16s32f(const int16_t* src1, const int16_t* src2, int32_t len, float* norm);

  HmppResult HMPPS_NormDiff_L2_32fc64f(const Hmpp32fc* src1, const Hmpp32fc* src2, int32_t len, double* norm);

  HmppResult HMPPS_NormDiff_L2_64fc64f(const Hmpp64fc* src1, const Hmpp64fc* src2, int32_t len, double* norm);

- 有缩放的L2范数：
  HmppResult HMPPS_NormDiff_L2_16s32s_S(const int16_t* src1, const int16_t* src2, int32_t len, int32_t* norm, double scale);

- 有缩放的L2Sqr范数
  HmppResult HMPPS_NormDiff_L2Sqr_16s64s_S(const int16_t* src1, const int16_t* src2, int32_t len, int64_t* norm, double scale);

- 无穷范数
  HmppResult HMPPS_NormDiff_Inf_32f(const float* src1, const float* src2, int32_t len, float* norm);

  HmppResult HMPPS_NormDiff_Inf_64f(const double* src1, const double* src2, int32_t len, double* norm);

  HmppResult HMPPS_NormDiff_Inf_16s32f(const int16_t* src1, const int16_t* src2, int32_t len, float* norm);

  HmppResult HMPPS_NormDiff_Inf_32fc32f(const Hmpp32fc* rc1, const Hmpp32fc* src2, int32_t len, float* norm);

  HmppResult HMPPS_NormDiff_Inf_64fc64f(const Hmpp64fc* src1, const Hmpp64fc* src2, int32_t len, double* norm);

- 有缩放的无穷范数
  HmppResult HMPPS_NormDiff_Inf_16s32s_S(const int16_t* src1, const int16_t* src2, int32_t len, int32_t* norm, double scale);


#### 参数

| 参数名 | 描述 | 取值范围 | 输入/输出 |
| --- | --- | --- | --- |
| src1 | 指向被减数的指针。 | 非空 | 输入 |
| src2 | 指向减数的指针。 | 非空 | 输入 |
| len | 向量长度。 | (0,INT\_MAX] | 输入 |
| norm | 指向范数的指针。 | 非空 | 输出 |
| scale | 缩放因数。 | (0,INF)且输入为2^n | 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 | src1、src2、norm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 NormDiffExample(void) {
float src1[BUFFER_SIZE_T] = {3, 0, 2, -8, 3, 1, 7, 5, -2, 1};
float src2[BUFFER_SIZE_T] = {1, -7, 3, 7, 8, 2, 4, -8, 5, 5};
float norm1[1];
float norm2[1];
float norm3[1];
HmppResult sign1, sign2, sign3;
sign1 = HMPPS_NormDiff_Inf_32f(src1, src2, BUFFER_SIZE_T, norm1);
printf("NormDiffInf: result = %d\n", sign1);
if (sign1 != HMPP_STS_NO_ERR) {
return;
}
printf("Inf = %.2f\n", norm1[0]);
sign2 = HMPPS_NormDiff_L1_32f(src1, src2, BUFFER_SIZE_T, norm2);
printf("NormDiffL1: result = %d\n", sign2);
if (sign2 != HMPP_STS_NO_ERR) {
return;
}
printf("L1 = %.2f\n", norm2[0]);
sign3 = HMPPS_NormDiff_L2_32f(src1, src2, BUFFER_SIZE_T, norm3);
printf("NormDiffL2: result = %d\n", sign3);
if (sign3 != HMPP_STS_NO_ERR) {
return;
}
printf("L2 = %.2f\n", norm3[0]);
printf("\n");
}
```

运行结果：

```
NormDiffInf: result = 0
Inf = 15.00
NormDiffL1: result = 0
L1 = 58.00
NormDiffL2: result = 0
L2 = 23.41
```