金融数学 投资中e的rT次方指什么这个公式怎么得到的

是算continuous

compounding

的fv的公式里面的么

a=pe(rt)这个

其实,你这么想,这里的r是年利率,但是continuous

compounding的假设是利息在任何时候产生的同时就被加到本金里面去了所以,从这个定义里面得到的公式应该是:

a=p乘以(1+r/n)的n次方的t次方,n趋于无穷大

这个公式,通过微积分推导,和a=pe(rt)是等价的

希望能帮到你

其实,不用这么纠结,拿着用就完了,除了考试以外我相信你是不会遇到需要这个公式的地方的

没这种offer了已经唯一的实际意义就是自己心里知道最厉害的复利能要你多少利息:

)

是算continuous compounding 的FV的公式里面的么 A=Pe(rt)这个

其实,你这么想,这里的r是年利率,但是continuous compounding的假设是利息在任何时候产生的同时就被加到本金里面去了所以,从这个定义里面得到的公式应该是:

A=P乘以(1+r/n)的n次方的t次方,n趋于无穷大

这个公式,通过微积分推导,和A=Pe(rt)是等价的

希望能帮到你

其实,不用这么纠结,拿着用就完了,除了考试以外我相信你是不会遇到需要这个公式的地方的

没这种offer了已经唯一的实际意义就是自己心里知道最厉害的复利能要你多少利息: )

r 读取， t 文本文件，+ 可更新文件内容

mode

C string containing a file access mode It can be:

"r"    read: Open file for input operations The file must exist  

"w"    write: Create an empty file for output operations If a file with the same name already exists, its contents are discarded and the file is treated as a new empty file  

"a"    append: Open file for output at the end of a file Output operations always write data at the end of the file, expanding it Repositioning operations (fseek, fsetpos, rewind) are ignored The file is created if it does not exist  

"r+"    read/update: Open a file for update (both for input and output) The file must exist  

"w+"    write/update: Create an empty file and open it for update (both for input and output) If a file with the same name already exists its contents are discarded and the file is treated as a new empty file  

"a+"    append/update: Open a file for update (both for input and output) with all output operations writing data at the end of the file Repositioning operations (fseek, fsetpos, rewind) affects the next input operations, but output operations move the position back to the end of file The file is created if it does not exist  

With the mode specifiers above the file is open as a text file In order to open a file as a binary file, a "b"character has to be included in the mode string This additional "b" character can either be appended at the end of the string (thus making the following compound modes: "rb", "wb", "ab", "r+b", "w+b", "a+b") or be inserted between the letter and the "+" sign for the mixed modes ("rb+", "wb+", "ab+")

The new C standard (C2011, which is not part of C++) adds a new standard subspecifier ("x"), that can be appended to any "w" specifier (to form "wx", "wbx", "w+x" or "w+bx"/"wb+x") This subspecifier forces the function to fail if the file exists, instead of overwriting it

If additional characters follow the sequence, the behavior depends on the library implementation: some implementations may ignore additional characters so that for example an additional "t" (sometimes used to explicitly state a text file) is accepted

On some library implementations, opening or creating a text file with update mode may treat the stream instead as a binary file

Text files are files containing sequences of lines of text Depending on the environment where the application runs, some special character conversion may occur in input/output operations in text mode to adapt them to a system-specific text file format Although on some environments no conversions occur and both text files and binary files are treated the same way, using the appropriate mode improves portability

For files open for update (those which include a "+" sign), on which both input and output operations are allowed, the stream shall be flushed (fflush) or repositioned (fseek, fsetpos, rewind) before a reading operation that follows a writing operation The stream shall be repositioned (fseek, fsetpos, rewind) before a writing operation that follows a reading operation (whenever that operation did not reach the end-of-file)

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