mata_which.hlp

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{smcl}
{* 18mar2005}{...}
{cmd:help mata which}
{hline}
{* index mata tt}{...}
{* index which tt}{...}
{* index .mo file}{...}
{* index .mlib library files}{...}
{* index libraries}{...}

{title:Title}

{p 4 4 2}
{bf:[M-3] mata which -- Identify function}


{title:Syntax}

{p 8 16 2}
: {cmd:mata} {cmd:which}
{it:fcnname}{cmd:()}


{p 4 4 2}
This command is for use in Mata mode following Mata's colon prompt.
To use this command from Stata's dot prompt, type

		. {cmd:mata: mata which} ...


{title:Description}

{p 4 4 2}
{cmd:mata which} {it:fcnname}
looks for {it:fcnname}{cmd:()} and reports whether 
it is built-in, stored in a .mlib library, or stored in a .mo file.


{title:Remarks}

{p 4 4 2}
{cmd:mata} {cmd:which} {it:fcnname}{cmd:()} looks for 
{it:fcnname}{cmd:()} and reports where it is found:

	: {cmd:mata which I()}
	  I():  built-in

	: {cmd:mata which assert()}
	  assert():  lmatabase.mlib

	: {cmd:mata which myfcn()}
	  userfunction():  .\myfcn.mo

	: {cmd:mata which nosuchfunction()}
	{err:function nosuchfunction() not found}
	r(111);

{p 4 4 2}
Function {cmd:I()} is built-in; it was written in C and is a part of Mata
itself.

{p 4 4 2}
Function {cmd:assert()} is a library function and, as a matter of fact, 
its executable object code is located in the official 
function library lmatabase.

{p 4 4 2}
Function {cmd:myfcn()} exists and has its executable object code stored 
in file {cmd:myfcn.mo}, located in the current directory.

{p 4 4 2}
Function {cmd:nosuchfunction()} does not exist.

{p 4 4 2}
Going back to {cmd:mata} {cmd:which} {cmd:assert()}, which was found in 
lmatabase.mlib, if you wanted to know where 
lmatabase.mlib was stored, you could 
type {cmd:findfile} {cmd:lmbatabase.mlib}
at the Stata prompt; see 
{bf:{help findfile:[P] findfile}}.


{title:Also see}

{p 4 13 2}
Manual:  {hi:[M-3] mata which}

{p 4 13 2}
Online:  help for 
{bf:{help m3_intro:[M-3] intro}}
{p_end}