mf_strlen.hlp

是一个经济学管理应用软件 很难找的 但是经济学学生又必须用到

{smcl}
{* 28mar2005}{...}
{cmd:help mata strlen()}
{hline}
{* index strlen()}{...}
{* index length}{...}

{title:Title}

{p 4 4 2}
{bf:[M-5] strlen() -- Length of string}


{title:Syntax}

{p 8 12 2}
{it:real matrix} {cmd:strlen(}{it:string matrix s}{cmd:)}


{title:Description}

{p 4 4 2}
{cmd:strlen(}{it:s}{cmd:)} returns the length of -- the number of characters 
contained in -- the string {it:s}.

{p 4 4 2}
When {it:s} is not a scalar, {cmd:strlen()} returns element-by-element
results.


{title:Remarks}

{p 4 4 2}
Stata understands {cmd:strlen()} as a synonym for its own {cmd:length()}
function, so you can use the function named {cmd:strlen()} in both your Stata
and Mata code.  Do not, however, use {cmd:length()} in Mata when you 
mean {cmd:strlen()}.  Mata's {cmd:length()} function returns the 
length (number of elements) of a vector.


{title:Conformability}

    {cmd:strlen(}{it:s}{cmd:)}:
	{it:s}:  {it:r x c}
   {it:result}:  {it:r x c}


{title:Diagnostics}

{p 4 4 2}
{cmd:strlen(}{it:s}{cmd:)}, when {it:s} is a binary string (a string
containing binary 0), returns the overall length of the string, not the
location of the binary 0.  Use {cmd:strpos(}{it:s}{cmd:, char(0))} if you want
the location of the binary 0.


{title:Source code}

{p 4 4 2}
Function is built-in.


{title:Also see}

{p 4 13 2}
Manual:  {hi:[M-5] strlen()}

{p 4 13 2}
Online:  help for 
{bf:{help mf_strpos:[M-5] strpos()}};
{bf:{help m4_string:[M-4] string}}
{p_end}