mf_abs.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}
{* 21mar2005}{...}
{cmd:help mata abs()}
{hline}
{* index abs()}{...}
{* index length}{...}

{title:Title}

{p 4 4 2}
{bf:[M-5] abs() -- Absolute value (length)}


{title:Syntax}

{p 8 12 2}
{it:real matrix} {cmd:abs(}{it:numeric matrix Z}{cmd:)}


{title:Description}

{p 4 4 2}
For {it:Z} real, {cmd:abs(}{it:Z}{cmd:)} returns the elementwise absolute
values of {it:Z}.

{p 4 4 2}
For {it:Z} complex, {cmd:abs(}{it:Z}{cmd:)} returns the elementwise length of
each element.  If {it:Z}={it:a}+{it:b}i, returned is 
sqrt({it:a}^2+{it:b}^2), although the 
calculation is not made in that way.  The method actually used prevents 
overflow.


{title:Conformability}

    {cmd:abs(}{it:Z}{cmd:)}:
		{it:Z}:  {it:r x c}
	   {it:result}:  {it:r x c}


{title:Diagnostics}

{p 4 4 2}
{cmd:abs(.)} returns {cmd:.} (missing).


{title:Source code}

{p 4 4 2}
Functions are built-in.


{title:Also see}

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

{p 4 13 2}
Online:  help for 
{bf:{help m4_scalar:[M-4] scalar}}
{p_end}