---
title: KmlIssCgSolve?I
description: "求解线性代数方程组。"
url: https://www.hikunpeng.com/document/detail/zh/kunpengboostkithistory/240RC1/accel/kunpengaccel_kml_16_0449.html
sourcePath: /source/zh/kunpengboostkithistory/240RC1/accel/kunpengaccel_kml_16_0449.html
indexId: c7cd91c257119b737fdc12a3ae11aeaa08ef96917c36e3703706430ac557b65b76
---
# KmlIssCgSolve?I

求解线性代数方程组。

#### 接口定义

C Interface：

int KmlIssCgSolveSI(KmlSolverTask **handle, int nb, float *x, int ldx, const float *b, int ldb);

int KmlIssCgSolveDI(KmlSolverTask **handle, int nb, double *x, int ldx, const double *b, int ldb);


#### 参数

| 参数名 | 类型 | 描述 | 输入/输出 |
| --- | --- | --- | --- |
| handle | KmlSolverTask \*\* | 求解器句柄，传入之前步骤的变量。 | 输入/输出 |
| nb | int | 右端项矢量的个数，当前nb只能为1。 | 输入 |
| x | 在KmlIssCgSolveSI中为float \* 在KmlIssCgSolveDI中为double \* | 读取并存储求解结果，其元素个数为n。 | 输入/输出 |
| ldx | int | x的leading dimension大小，当前参数未使用。 | 输入 |
| b | 在KmlIssCgSolveSI中为const float \* 在KmlIssCgSolveDI中为const double \* | 读取右端项，其元素个数为n。 | 输入 |
| ldb | int | b的leading dimension大小，当前参数未使用。 | 输入 |


#### 返回值

| 返回值 | 类型 | 描述 |
| --- | --- | --- |
| KMLSS\_NO\_ERROR | int | 正常执行。 |
| KMLSS\_BAD\_NB | int | 参数nb不等于1。 |
| KML\_NO\_MEMORY | int | 内存不足。 |
| KMLSS\_NULL\_ARGUMENT | int | {handle, x, b}中存在空参数。 |


#### 依赖

#include "kml_iss.h"


#### 示例

C Interface：

```
KmlSolverTask *handle;
int ierr;
int n = 8;
double a[26] = {1.0, 1.0, 2.0, 9.0, 2.0, 1.0, -3.0, 2.0, 3.0, 2.0, 1.0, 1.0, 9.0, -5.0, 2.0, 6.0, 1.0, -3.0, 1.0, 4.0, 1.0, -5.0, 7.0, 2.0,1.0, 2.0};
int ja[26] = {0, 3, 4, 1, 2, 3, 5, 1, 2, 7, 0, 1, 3, 6, 0, 4, 5, 1, 4, 5, 7, 3, 6, 2, 5, 7};
int ia[9] = {0, 3, 7, 10, 14, 17, 21, 23, 26};
ierr = KmlIssCgInitDI(&handle, n, a, ja, ia);
ierr = KmlIssCgAnalyzeDI(&handle);
ierr = KmlIssCgFactorizeDI(&handle);
int nd = 1;
int idata[] = {0};
double ddata[] = {0};
double eps = 1e-4;
ierr = KmlIssCgSetDID(&handle, KMLSS_THRESHOLD, &eps, nd);
int max_iters = 2000;
ierr = KmlIssCgSetDII(&handle, KMLSS_MAX_ITERATION_COUNT, &max_iters, nd);
int ldx = n;
int ldb = n;
int nb = 1;
double b[8] = {4.0, 9.0, 7.0, 6.0, 9.0, 3.0, 2.0, 5.0};
double x[8];
ierr = KmlIssCgSolveDI(&handle, nb, x, ldx, b, ldb);
if (ierr != 0) {
printf("\nERROR in KmlIssCgSolveDI: %d", ierr);
return 1;
}
```