---
title: KmlIssCgGet?I?
description: "获得迭代求解相关参数。"
url: https://www.hikunpeng.com/document/detail/zh/kunpengboostkithistory/240RC1/accel/kunpengaccel_kml_16_0450.html
sourcePath: /source/zh/kunpengboostkithistory/240RC1/accel/kunpengaccel_kml_16_0450.html
indexId: ec69919c75035da6f8dc65b34f43114cf7d2fe482aab232c724826c5a6e901eb76
---
# KmlIssCgGet?I?

获得迭代求解相关参数。

#### 接口定义

C Interface：

int KmlIssCgGetSII(KmlSolverTask **handle, enum KML_SOLVER_PARAM param, int *data, int nd);

int KmlIssCgGetDII(KmlSolverTask **handle, enum KML_SOLVER_PARAM param, int *data, int nd);

int KmlIssCgGetSIS(KmlSolverTask **handle, enum KML_SOLVER_PARAM param, float *data, int nd);

int KmlIssCgGetDID(KmlSolverTask **handle, enum KML_SOLVER_PARAM param, double *data, int nd);


#### 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 |
| param | enum KML\_SOLVER\_PARAM | KMLSS\_ITERATION\_COUNT表示迭代次数。 KMLSS\_TOLERANCE表示最终的迭代残差。 | 输入 |
| data | 在KmlIssCgGetSII中为int \*。 在KmlIssCgGetDII中为int \*。 在KmlIssCgGetSIS中为float \*。 在KmlIssCgGetDID中为double \*。 | 在KmlIssCgGetSII中为迭代步数。 在KmlIssCgGetDII中为迭代步数。 在KmlIssCgGetSIS中为残差。 在KmlIssCgGetDID中为残差。 | 输出 |
| nd | int | data数组元素个数。 | 输入 |


#### 返回值

| 返回值 | 类型 | 描述 |
| --- | --- | --- |
| KMLSS\_NO\_ERROR | int | 正常执行。 |
| KMLSS\_DATA\_SIZE | int | 参数nd不等于1。 |
| KMLSS\_NULL\_ARGUMENT | int | {handle, data}中存在空参数。 |
| KMLSS\_BAD\_SELECTOR | int | param为无效参数。 |


#### 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);
ierr = KmlIssCgGetDII(&handle, KMLSS_ITERATION_COUNT, idata, nd);
if (ierr != 0) {
printf("\nERROR in KmlIssCgGetDII: %d", ierr);
return 1;
}
ierr = KmlIssCgGetDID(&handle, KMLSS_TOLERANCE, ddata, nd);
if (ierr != 0) {
printf("\nERROR in KmlIssCgGetDID: %d", ierr);
return 1;
}
printf("[Solve info] Res= \t%.12g\t, iteration = \t%d\t\n", sqrt(ddata[0]), idata[0]);
```


运行结果

```
[Solve info] Res=       1.25581676326e-12       , iteration =   8
```