mf_exp.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 exp()}
{hline}
{* index exponentiation}{...}
{* index logarithms}{...}
{* index exp()}{...}
{* index ln()}{...}
{* index log()}{...}
{* index log10()}{...}

{title:Title}

{p 4 4 2}
{bf:[M-5] exp() -- Exponentiation and logarithms}


{title:Syntax}

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

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

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

{p 8 12 2}
{it:numeric matrix}
{cmd:log10(}{it:numeric matrix Z}{cmd:)}


{title:Description}

{p 4 4 2}
{cmd:exp(}{it:Z}{cmd:)} returns the elementwise exponentiation of {it:Z}.
{cmd:exp()} returns real if {it:Z} is real and complex if {it:Z} is complex.

{p 4 4 2}
{cmd:ln(}{it:Z}{cmd:)} and {cmd:log(}{it:Z}{cmd:)} return the elementwise
natural logarithm of {it:Z}.  The functions are synonyms for each other.
{cmd:ln()} and {cmd:log()} return real if {it:Z} is real and complex if {it:Z}
is complex.

{p 4 4 2}
{cmd:log10(}{it:Z}{cmd:)} returns the elementwise log-base-10 of {it:Z}.
{cmd:log10()} returns real if {it:Z} is real and complex if {it:Z} is complex.


{title:Conformability}

{p 4 4 2}
{cmd:exp(}{it:Z}{cmd:)},
{cmd:ln(}{it:Z}{cmd:)},
{cmd:log(}{it:Z}{cmd:)},
{cmd:log10(}{it:Z}{cmd:)}:
{p_end}
	     {it:Z}:  {it:r x c}
	{it:result}:  {it:r x c}


{title:Diagnostics}

{p 4 4 2}
{cmd:exp(}{it:Z}{cmd:)} returns missing when Re({it:Z})>709.

{p 4 4 2}
{cmd:ln(}{it:Z}{cmd:)}, 
{cmd:log(}{it:Z}{cmd:)}, and
{cmd:log10(}{it:Z}{cmd:)}
return missing when {it:Z} is real and {it:Z}<=0.


{title:Source code}

{p 4 4 2}
{view log10.mata, adopath asis:log10.mata};
remaining functions are built-in.


{title:Also see}

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

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