matrix_subscripting.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}
{* 05apr2005}{...}
{cmd:help matrix subscripting}
{hline}

{title:Title}

{pstd}
{hi:[P] matrix define} {hline 2} Matrix subscripting


{title:Syntax}

{p 8 14 2}
{cmdab:mat:rix} {it:A} {cmd:=} {it:...} {it:B}{cmd:[}{it:r}{cmd:,}{it:c}{cmd:]} {it:...}

{pstd}
where {it:r} and {it:c} are numeric or string scalar expressions.


{title:Description}

{pstd}
Subscripting with numeric expressions may be used in any expression context
(such as {helpb generate}, {helpb replace}, etc.)  Subscripting by row/column
name may only be used in a matrix context.  (This latter is not a constraint;
see the {cmd:rownumb()} and {cmd:colnumb()} matrix functions returning scalar
in {hi:[P] matrix define} and {help matrix functions}; they may be used
in any expression context.)


{title:Examples}

{phang}{cmd:. matrix A = A/A[1,1]}{p_end}
{phang}{cmd:. matrix B = A["weight","displ"]}{p_end}
{phang}{cmd:. matrix D = G[1,"eq1:l1.gnp"]}


{title:Also see}

{psee}
Manual:  {bf:[U] 14 Matrix expressions},{break}
{bf:[P] matrix define}

{psee}
Online:  {helpb matrix};
{help matrix extraction},
{help matrix substitution}
{p_end}