m3_intro.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}
{* 18mar2005}{...}
{cmd:help m3 intro}
{hline}
{* index mata commands}{...}

{title:Title}

{p 4 4 2}
{bf:[M-3] intro -- Commands for controlling Mata}


{title:Syntax}

{p 4 4 2}
Command for invoking Mata from Stata:

{col 10}  [M-3] entry{col 30}description
{col 10}{hline 55}
{col 10}{...}
. {bf:{help m3_mata:mata}}{...}
{col 30}invoke Mata
{col 10}{hline 55}

{p 4 4 2}
Once you are running Mata, you can use the following commands from the 
colon prompt:

{col 10}  [M-3] entry{col 30}description
{col 10}{hline 55}
{col 10}{...}
: {bf:{help mata_help:mata help}}{...}
{col 30}execute {cmd:help} command

{col 10}{...}
: {bf:{help mata_clear:mata clear}}{...}
{col 30}clear Mata
{*}{...}
{col 10}{...}
: {bf:{help mata_describe:mata describe}}{...}
{col 30}describe contents of Mata's memory
{*}{...}
{col 10}{...}
: {bf:{help mata_memory:mata memory}}{...}
{col 30}display memory-usage report
{*}{...}
{col 10}{...}
: {bf:{help mata_rename:mata rename}}{...}
{col 30}rename matrix or function
{*}{...}
{col 10}{...}
: {bf:{help mata_drop:mata drop}}{...}
{col 30}remove from memory matrix or function
{*}{...}
{col 10}{...}

{col 10}{...}
: {bf:{help mata_mosave:mata mosave}}{...}
{col 30}create object file
{*}{...}
{col 10}{...}
: {bf:{help mata_mlib:mata mlib}}{...}
{col 30}create function library
{*}{...}

{col 10}{...}
: {bf:{help mata_matsave:mata matsave}}{...}
{col 30}save matrices
{*}{...}
{*}{...}
{col 10}{...}
: {bf:{help mata_matsave:mata matuse}}{...}
{col 30}restore matrices
{col 10}{...}
: {bf:{help mata_matsave:mata matdescribe}}{...}
{col 30}describe contents of matrix file
{*}{...}

{col 10}{...}
: {bf:{help mata_which:mata which}}{...}
{col 30}identify function

{col 10}{...}
: {bf:{help mata_set:mata query}}{...}
{col 30}display values of settable parameters
{*}{...}
{col 10}{...}
: {bf:{help mata_set:mata set}}{...}
{col 30}set parameters

{col 10}{...}
: {bf:{help mata_stata:mata stata}}{...}
{col 30}execute Stata command

{col 10}{...}
: {bf:{help m3_end:end}}{...}
{col 30}exit Mata and go back to Stata
{col 10}{hline 55}


{title:Description}

{p 4 4 2}
When you type something at the Mata prompt, it is assumed to be a Mata 
statement -- something that can be compiled and executed -- such as

	: {cmd:2+3}
	  5

{p 4 4 2}
The {cmd:mata} command, however, is different.  When what you type is prefixed
by the word {cmd:mata}, think of yourself as standing outside of Mata and
giving an instruction that affects the Mata environment and the way Mata
works.  For instance, typing

	: {cmd:mata clear}

{p 4 4 2}
says that Mata is to be cleared.  Typing 

	: {cmd:mata set matastrict on}

{p 4 4 2}
says that Mata is to require that programs explicitly declare their
arguments and their working variables; see 
{bf:{help m2_declarations:[M-2] declarations}}.


{title:Remarks}

{p 4 4 2}
The {cmd:mata} command cannot be used inside functions.  It would make 
no sense to code

	{cmd:function foo(}...{cmd:)}
	{cmd:{c -(}}
		...
		{cmd:mata query}
		...
	{cmd:{c )-}}

{p 4 4 2}
because {cmd:mata query} is something that can only be typed at the Mata colon
prompt:

	: {cmd:mata query}
	{it:(output omitted)}

{p 4 4 2}
See {bf:{help m1_how:[M-1] how}}.


{title:Also see}

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

{p 4 13 2}
Online:  help for 
{bf:{help mata:[M-0] intro}}
{p_end}