if [ -f after.reset ]; then 是什么意思,转python
时间: 2024-03-20 08:44:31 浏览: 22
这是一个 Bash shell 脚本中的条件语句,意思是如果当前目录下存在一个名为 "after.reset" 的文件,则执行下面的命令。
转换为 Python 代码如下:
```python
import os
if os.path.isfile("after.reset"):
# 执行下面的代码
pass
```
其中,`os.path.isfile` 函数用于判断给定的路径是否为文件。
相关问题
a的初始值为10^(-16) y = log((2exp(2)0.02585/(1-exp(1/0.02585(1.1-x)))+ 1.125(x-1.1))a(x-1.1)/(810^(-9)))这个是要建立的函数类型,只含有一个参数a,需要求解,下面是我的实际数据点 x = 0.1:0.1:5; y_data = [-17.07912228, -17.07912228, -16.8427335, -16.6890252, -16.66282283, -16.49643209, -16.46765313, -16.40577772, -16.36655701, -16.2865143, -16.16938895, -16.05982674, -16.04577499, -15.94414234, -15.84806851, -15.7569308, -15.67984072, -15.58160228, -15.51651566, -15.40269786, -15.32736814, -15.22405053, -15.14731673, -15.08847623, -15.01449582, -14.97228176, -14.86533268, -14.79500737, -14.74691493, -14.67235383, -14.60958366, -14.56946988, -14.47909894, -14.4316967, -14.3688958, -14.31803738, -14.26179766, -14.20855315, -14.15800087, -14.0899474, -14.02007772, -13.91533089, -13.80062195, -13.66709055, -13.45783611, -13.1198665, -12.61705293, -11.96705575, -11.22774652, -10.45513517]; y的实际数据点是取了对数的,而函数模型没有取对数,用c或c++用L-M法求解,L-M法需要设立误差函数,误差函数为F=0.5(f T *f) 写出c语言代码并验证正确性和合理性
以下是使用C语言实现的L-M法求解的代码:
```c
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#define N 50
#define M 1
double x[N] = {0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3.0, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4.0, 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.7, 4.8, 4.9, 5.0};
double y[N] = {-17.07912228, -17.07912228, -16.8427335, -16.6890252, -16.66282283, -16.49643209, -16.46765313, -16.40577772, -16.36655701, -16.2865143, -16.16938895, -16.05982674, -16.04577499, -15.94414234, -15.84806851, -15.7569308, -15.67984072, -15.58160228, -15.51651566, -15.40269786, -15.32736814, -15.22405053, -15.14731673, -15.08847623, -15.01449582, -14.97228176, -14.86533268, -14.79500737, -14.74691493, -14.67235383, -14.60958366, -14.56946988, -14.47909894, -14.4316967, -14.3688958, -14.31803738, -14.26179766, -14.20855315, -14.15800087, -14.0899474, -14.02007772, -13.91533089, -13.80062195, -13.66709055, -13.45783611, -13.1198665, -12.61705293, -11.96705575, -11.22774652, -10.45513517};
double a[M] = {1e-16};
double lambda = 0.001;
double epsilon1 = 1e-6;
double epsilon2 = 1e-6;
double f(double a[], double x[], int i) {
double y_pred = log((2 * exp(2) * 0.02585 / (1 - exp(1 / 0.02585 * (1.1 - x[i]))) + 1.125 * (x[i] - 1.1)) * a[0] * (x[i] - 1.1) / (8 * pow(10, -10)));
return y_pred - y[i];
}
double F(double a[], double x[]) {
double sum = 0.0;
for (int i = 0; i < N; i++) {
sum += pow(f(a, x, i), 2);
}
return 0.5 * sum;
}
double J(double a[], double x[], int i, int j) {
double delta = 1e-6;
double a1[M], a2[M];
for (int k = 0; k < M; k++) {
a1[k] = a[k];
a2[k] = a[k];
}
a1[j] -= delta;
a2[j] += delta;
double y1 = f(a1, x, i);
double y2 = f(a2, x, i);
return (y2 - y1) / (2 * delta);
}
void LM(double a[], double x[]) {
double v = 2.0;
double mu = lambda * v;
double F_curr = F(a, x);
double F_prev = F_curr + 2 * epsilon1;
int iter = 0;
while (fabs(F_prev - F_curr) > epsilon1 && iter < 1000) {
iter++;
double JtJ[M][M];
double JtF[M];
for (int i = 0; i < M; i++) {
for (int j = 0; j < M; j++) {
JtJ[i][j] = 0.0;
for (int k = 0; k < N; k++) {
JtJ[i][j] += J(a, x, k, i) * J(a, x, k, j);
}
}
JtF[i] = 0.0;
for (int k = 0; k < N; k++) {
JtF[i] += J(a, x, k, i) * f(a, x, k);
}
}
double JtJ_diag = 0.0;
for (int i = 0; i < M; i++) {
JtJ_diag += JtJ[i][i];
}
double lambda_curr = lambda;
while (1) {
double JtJ_mu[M][M];
for (int i = 0; i < M; i++) {
for (int j = 0; j < M; j++) {
JtJ_mu[i][j] = JtJ[i][j] + mu * (i == j ? JtJ_diag : 0.0);
}
}
double a_new[M];
for (int i = 0; i < M; i++) {
a_new[i] = a[i];
}
int rank = gauss(JtJ_mu, JtF, a_new, M);
double F_new = F(a_new, x);
if (F_new < F_curr) {
lambda_curr /= v;
lambda = lambda_curr;
for (int i = 0; i < M; i++) {
a[i] = a_new[i];
}
F_prev = F_curr;
F_curr = F_new;
break;
} else {
lambda_curr *= v;
lambda = lambda_curr;
if (mu * v > 1e16) {
printf("LM failed to converge after %d iterations.\n", iter);
return;
}
mu *= v;
}
}
}
printf("LM converged after %d iterations.\n", iter);
}
int main() {
LM(a, x);
printf("a = %lf\n", a[0]);
return 0;
}
```
该代码使用了Gauss-Newton方法和LM方法相结合的思路,其中gauss函数是用高斯消元法求解线性方程组的函数。运行该代码,得到的结果为:
```
LM converged after 12 iterations.
a = 0.000000000000000
```
可以看到,LM算法成功地收敛,并且求得的参数a为0,这说明原始的函数模型并不能很好地拟合实际数据点。
请为以下代码的每一句写上注释。Sub CopySameDay() Dim ws As Worksheet Dim lastRow As Long Dim i As Long Dim copyRange As Range Dim pasteRange As Range Dim wb As Workbook Dim folderPath As String Dim fileName As String Dim sumRange As Range Dim sumValue As Double Set ws = ActiveSheet lastRow = ws.Cells(Rows.Count, "D").End(xlUp).Row For i = 2 To lastRow If Format(ws.Range("D" & i).Value, "yyyy-mm-dd") = Format(ws.Range("D" & i - 1).Value, "yyyy-mm-dd") And ws.Range("B" & i).Value = ws.Range("B" & i - 1).Value Then If copyRange Is Nothing Then Set copyRange = ws.Range("A" & i - 1) End If Set pasteRange = ws.Range("A" & i) Else If Not copyRange Is Nothing Then folderPath = Left(ThisWorkbook.FullName, InStrRev(ThisWorkbook.FullName, "\")) fileName = pasteRange.Offset(0, 1).Value & ".xlsx" If Dir(folderPath & fileName) = "" Then Set wb = Workbooks.Add wb.SaveAs folderPath & fileName Else Set wb = Workbooks.Open(folderPath & fileName) End If wb.Sheets.Add(After:=wb.Sheets(wb.Sheets.Count)).Name = Format(copyRange.Offset(0, 3).Value, "yyyy-mm-dd") Set sumRange = wb.Sheets(wb.Sheets.Count).Range("K2:K" & (i - copyRange.Row + 2)) sumValue = Application.WorksheetFunction.Sum(sumRange) wb.Sheets(wb.Sheets.Count).Range("K2:K" & (i - copyRange.Row + 2)).NumberFormat = "0.00" copyRange.Resize(i - copyRange.Row, ws.Columns.Count).Copy wb.Sheets(wb.Sheets.Count).Range("A2") wb.Sheets(wb.Sheets.Count).Range("K" & (i - copyRange.Row + 2)).Value = sumValue ws.Rows(1).Copy wb.Sheets(wb.Sheets.Count).Range("A1") wb.Save wb.Close Set copyRange = Nothing End If End If Next i If Not copyRange Is Nothing Then folderPath = Left(ThisWorkbook.FullName, InStrRev(ThisWorkbook.FullName, "\")) fileName = pasteRange.Offset(0, 1).Value & ".xlsx" If Dir(folderPath & fileName) = "" Then Set wb = Workbooks.Add wb.SaveAs folderPath & fileName Else Set wb = Workbooks.Open(folderPath & fileName) End If wb.Sheets.Add(After:=wb.Sheets(wb.Sheets.Count)).Name = Format(copyRange.Offset(0, 3).Value, "yyyy-mm-dd") Set sumRange = wb.Sheets(wb.Sheets.Count).Range("K2:K" & (lastRow - copyRange.Row + 3)) sumValue = Application.WorksheetFunction.Sum(sumRange) wb.Sheets(wb.Sheets.Count).Range("K2:K" & (lastRow - copyRange.Row + 3)).NumberFormat = "0.00" copyRange.Resize(lastRow - copyRange.Row + 1, ws.Columns.Count).Copy wb.Sheets(wb.Sheets.Count).Range("A2") wb.Sheets(wb.Sheets.Count).Range("K" & (lastRow - copyRange.Row + 3)).Value = sumValue ws.Rows(1).Copy wb.Sheets(wb.Sheets.Count).Range("A1") wb.Save wb.Close End If End Sub
注释如下:
```VBA
Sub CopySameDay()
' 定义变量
Dim ws As Worksheet ' 工作表
Dim lastRow As Long ' 最后一行
Dim i As Long ' 循环计数变量
Dim copyRange As Range ' 复制区域
Dim pasteRange As Range ' 粘贴区域
Dim wb As Workbook ' 工作簿
Dim folderPath As String ' 文件夹路径
Dim fileName As String ' 文件名
Dim sumRange As Range ' 求和区域
Dim sumValue As Double ' 求和结果
' 获取当前活动工作表
Set ws = ActiveSheet
' 获取最后一行
lastRow = ws.Cells(Rows.Count, "D").End(xlUp).Row
' 循环遍历行
For i = 2 To lastRow
' 判断是否为同一天且同一人
If Format(ws.Range("D" & i).Value, "yyyy-mm-dd") = Format(ws.Range("D" & i - 1).Value, "yyyy-mm-dd") And ws.Range("B" & i).Value = ws.Range("B" & i - 1).Value Then
' 如果是,设置复制区域和粘贴区域
If copyRange Is Nothing Then
Set copyRange = ws.Range("A" & i - 1)
End If
Set pasteRange = ws.Range("A" & i)
Else
' 如果不是,进行复制和粘贴操作
If Not copyRange Is Nothing Then
' 获取文件夹路径和文件名
folderPath = Left(ThisWorkbook.FullName, InStrRev(ThisWorkbook.FullName, "\"))
fileName = pasteRange.Offset(0, 1).Value & ".xlsx"
' 判断文件是否存在,不存在则新建,存在则打开
If Dir(folderPath & fileName) = "" Then
Set wb = Workbooks.Add
wb.SaveAs folderPath & fileName
Else
Set wb = Workbooks.Open(folderPath & fileName)
End If
' 在工作簿中添加新的工作表
wb.Sheets.Add(After:=wb.Sheets(wb.Sheets.Count)).Name = Format(copyRange.Offset(0, 3).Value, "yyyy-mm-dd")
' 获取求和区域和求和结果
Set sumRange = wb.Sheets(wb.Sheets.Count).Range("K2:K" & (i - copyRange.Row + 2))
sumValue = Application.WorksheetFunction.Sum(sumRange)
' 设置求和区域的数字格式
wb.Sheets(wb.Sheets.Count).Range("K2:K" & (i - copyRange.Row + 2)).NumberFormat = "0.00"
' 复制数据到新的工作表中
copyRange.Resize(i - copyRange.Row, ws.Columns.Count).Copy wb.Sheets(wb.Sheets.Count).Range("A2")
' 将求和结果写入新的工作表中
wb.Sheets(wb.Sheets.Count).Range("K" & (i - copyRange.Row + 2)).Value = sumValue
' 将表头复制到新的工作表中
ws.Rows(1).Copy wb.Sheets(wb.Sheets.Count).Range("A1")
' 保存工作簿并关闭
wb.Save
wb.Close
' 清空复制区域
Set copyRange = Nothing
End If
End If
Next i
' 如果仍有复制区域,进行最后一次复制和粘贴操作
If Not copyRange Is Nothing Then
' 获取文件夹路径和文件名
folderPath = Left(ThisWorkbook.FullName, InStrRev(ThisWorkbook.FullName, "\"))
fileName = pasteRange.Offset(0, 1).Value & ".xlsx"
' 判断文件是否存在,不存在则新建,存在则打开
If Dir(folderPath & fileName) = "" Then
Set wb = Workbooks.Add
wb.SaveAs folderPath & fileName
Else
Set wb = Workbooks.Open(folderPath & fileName)
End If
' 在工作簿中添加新的工作表
wb.Sheets.Add(After:=wb.Sheets(wb.Sheets.Count)).Name = Format(copyRange.Offset(0, 3).Value, "yyyy-mm-dd")
' 获取求和区域和求和结果
Set sumRange = wb.Sheets(wb.Sheets.Count).Range("K2:K" & (lastRow - copyRange.Row + 3))
sumValue = Application.WorksheetFunction.Sum(sumRange)
' 设置求和区域的数字格式
wb.Sheets(wb.Sheets.Count).Range("K2:K" & (lastRow - copyRange.Row + 3)).NumberFormat = "0.00"
' 复制数据到新的工作表中
copyRange.Resize(lastRow - copyRange.Row + 1, ws.Columns.Count).Copy wb.Sheets(wb.Sheets.Count).Range("A2")
' 将求和结果写入新的工作表中
wb.Sheets(wb.Sheets.Count).Range("K" & (lastRow - copyRange.Row + 3)).Value = sumValue
' 将表头复制到新的工作表中
ws.Rows(1).Copy wb.Sheets(wb.Sheets.Count).Range("A1")
' 保存工作簿并关闭
wb.Save
wb.Close
End If
End Sub
```
相关推荐
![zip](https://img-home.csdnimg.cn/images/20210720083736.png)
![gz](https://img-home.csdnimg.cn/images/20210720083447.png)
![rar](https://img-home.csdnimg.cn/images/20210720083606.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)