mf__transpose.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}
{* 28mar2005}{...}
{cmd:help mata _transpose()}
{hline}
{* index transposition}{...}
{* index transpose}{...}
{* index conjugate}{...}
{* index conjugate transpose}{...}
{* index _transpose()}{...}
{* index _conj()}{...}

{title:Title}

{p 4 4 2}
{bf:[M-5] _transpose() -- Transposition in place}


{title:Syntax}

{p 8 8 2}
{it:void}
{cmd:_transpose(}{it:numeric matrix} {it:A}{cmd:)}

{p 8 8 2}
{it:void}{bind:     }
{cmd:_conj(}{it:numeric matrix} {it:A}{cmd:)}


{title:Description}

{p 4 4 2}
{cmd:_transpose(}{it:A}{cmd:)} replaces {it:A} with {it:A}{bf:'}.  Coding
{cmd:_transpose(}{it:A}{cmd:)} is equivalent to coding 
{bind:{it:A} {cmd:=} {it:A}{cmd:'}}, except that execution can take a little
longer and less memory is used.
When {it:A} is complex, {it:A} is replaced with its conjugate transpose;
see {bf:{help mf_transposeonly:[M-5] transposeonly()}} if transposition
without conjugation is desired.

{p 4 4 2}
{cmd:_conj(}{it:A}{cmd:)} replaces {it:A} with {cmd:conj(}{it:A}{cmd:)}.
Coding {cmd:_conj(}{it:A}{cmd:)} is equivalent to coding 
{bind:{it:A} {cmd:=} {cmd:conj(}{it:A}{cmd:)}},
except that less memory is used.


{title:Remarks}

{p 4 4 2}
In some calculation, you need {it:A}{bf:'} 

		{it:X} = ... {it:calculation using A}{bf:'} ...

{p 4 4 2}
If {it:A} is large, you can save considerable memory by coding 

		{cmd:_transpose(}{it:A}{cmd:)}
		{it:X} = ... {it:calculation using A} ...
		{cmd:_transpose(}{it:A}{cmd:)}


{title:Conformability}

    {cmd:_transpose(}{it:A}{cmd:)}:
	{it:input:}
		{it:A}:  {it:r x c}
	{it:output:}
		{it:A}:  {it:c x r}

    {cmd:_conj(}{it:A}{cmd:)}:
	{it:input:}
		{it:A}:  {it:r x c}
	{it:output:}
		{it:A}:  {it:r x c}


{title:Diagnostics}

{p 4 4 2}
{cmd:_transpose(}{it:A}{cmd:)}
aborts with error if {it:A} is a view.

{p 4 4 2}
{cmd:_conj(}{it:A}{cmd:)} 
does nothing if {it:A} is real (and hence, does not abort if {it:A} 
is a view).


{title:Also see}

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

{p 4 13 2}
Online:  help for 
{bf:{help m2_op_transpose:[M-2] op_transpose}};
{bf:{help mf_transposeonly:[M-5] transposeonly()}}, 
{bf:{help mf_conj:[M-5] conj()}}; 
{bf:{help m4_manipulation:[M-4] manipulation}}
{p_end}