fname <- rev(strsplit(fx, '/')[[1]])[2]

This code snippet extracts the second-to-last element from a string that is separated by forward slashes ("/").

Here's how it works:

1. `strsplit(fx, '/')` splits the string stored in `fx` using the "/" character as a delimiter. This creates a list of substrings.
2. `[[1]]` selects the first element of the list, which is itself a character vector.
3. `rev()` reverses the order of the elements in the character vector.
4. `[2]` selects the second element of the reversed vector, which is the second-to-last element of the original vector.

Finally, the result is assigned to a variable called `fname`.

相关问题

<TR height=> <TD align="center" >教学方向:</TD> <TD align="center"> <select name="fangxiangid"> <c:forEach items="${fangxianglist}" var="fangxiang"> <option value="${fangxiang.id }">${fangxiang.fname }</option> </c:forEach> </select> </TD> </TR> <TR height=> <TD align="center" >班级名称:</TD> <TD align="center"> <input type="text" name="bname" id='bnameid' size="30" /> </TD> </TR> <TR height=> <TD align="center" > 操作：</TD> <TD align="center"> <input type="submit" value="提交" style="width: 60px" /> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <input onclick="javascript:history.go(-1);" style="width: 60px" type="button" value="返回" /> </TD> </TR> </TABLE> </form> </td> </tr> </table> </body>

这段代码是一个表单，包含了三个表格行。第一个表格行包含了一个表格单元格，其中有一个下拉框，下拉框中的选项是通过 JSP 的 forEach 标签动态生成的。第二个表格行包含了一个表格单元格，其中有一个文本输入框，用户可以在输入框中输入班级名称。第三个表格行包含了两个表格单元格，其中一个是用于提交表单的提交按钮，另一个是用于返回上一页的按钮。整个表单的目的是为了创建一个班级，用户可以在下拉框中选择教学方向，并在文本输入框中输入班级名称，然后提交表单以创建班级。

string filename; ofstream outfile("D:\fname.txt"); // 打开文件写入 if (!outfile) { cout << "文件打开失败！" << endl; return; } for (auto p = i.v.begin(); p != i.v.end(); ++p) { outfile << p->num << " " << p->name << " " << p->sex << " " << p->score1 << " " << p->score2 << " " << p->score3 << endl; } outfile.close(); // 关闭文件完善上述代码使其实现保存到fname。txt上

string filename;
cout << "请输入文件名：";
cin >> filename;
filename = "D:\\" + filename + ".txt"; // 拼接完整的文件路径
ofstream outfile(filename);
if (!outfile) {
cout << "文件打开失败！" << endl;
return;
}
for (auto p = i.v.begin(); p != i.v.end(); ++p) {
outfile << p->num << " " << p->name << " " << p->sex << " " << p->score1 << " " << p->score2 << " " << p->score3 << endl;
}
outfile.close();
cout << "保存成功！" << endl;