功能:创建Excel写对象

格式:
[exl, k] = ExcelCreate(f)
f:字符串存储一个可以写的Excel文件路径

exl:执行成功返回Excel对象
k  :执行成功与否的标志，返回1表示成功，返回0表示失败

说明:
1、本函数创建的Excel对象，仅可以在后续指定表格里写字符串与矩阵变量

例子:
//执行下面的代码,将生成一个xls文件

f = {FileSaveDialog<矩阵运算\FileSaveDialog>}(,,"xls");
exl = ExcelCreate(f);
a = "时间,金额,次数";
b = {SymVectorSplit<矩阵运算\SymVectorSplit>}(a,",");
m = {rand<矩阵运算\rand>}(10,4,3); 
{ExcelWriteRowStr<矩阵运算\ExcelWriteRowStr>}(exl,b,2,1);
{ExcelWriteMatrix<矩阵运算\ExcelWriteMatrix>}(exl,m,3,1);

a2 = "次数,金额";
b2 = {SymVectorSplit<矩阵运算\SymVectorSplit>}(a2,",");
m1 = {rand<矩阵运算\rand>}(100,6,2); 
m2 = {int<矩阵运算\int>}(m1); 
{ExcelWriteRowStr<矩阵运算\ExcelWriteRowStr>}(exl,b2,2,5);
{ExcelWriteMatrix<矩阵运算\ExcelWriteMatrix>}(exl,m2,3,5);

{ExcelClose<矩阵运算\ExcelClose>}(exl);