mf_st_vartype.hlp

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{smcl}
{* 28mar2004}{...}
{cmd:help mata st_vartype()}
{hline}
{* index st_vartype()}{...}
{* index st_isnumvar()}{...}
{* index st_isstrvar()}{...}

{title:Title}

{p 4 4 2}
{bf:[M-5] st_vartype() -- Storage type of Stata variable}


{title:Syntax}

{p 8 12 2}
{it:string scalar}
{cmd:st_vartype(}{it:scalar var}{cmd:)}

{p 8 12 2}
{it:real scalar}{bind:  }
{cmd:st_isnumvar(}{it:scalar var}{cmd:)}

{p 8 12 2}
{it:real scalar}{bind:  }
{cmd:st_isstrvar(}{it:scalar var}{cmd:)}


{p 4 4 2}
where {it:var} contains a Stata variable name or a Stata variable index.


{title:Description}

{p 4 4 2}
In all the functions, if {it:var} is specified as a name, abbreviations 
are not allowed.

{p 4 4 2}
{cmd:st_vartype(}{it:var}{cmd:)}
returns the storage type of the {it:var}, such as {cmd:"float"},
{cmd:"double"}, {cmd:"str18"}, etc.

{p 4 4 2}
{cmd:st_isnumvar(}{it:var}{cmd:)}
returns 1 if {it:var} is a numeric variable and 0 otherwise.

{p 4 4 2}
{cmd:st_isstrvar(}{it:var}{cmd:)}
returns 1 if {it:var} is a string variable and 0 otherwise.


{title:Remarks}

{p 4 4 2}
{cmd:st_isstrvar(}{it:var}{cmd:)}
and 
{cmd:st_isnumvar(}{it:var}{cmd:)}
are antonyms.  Both functions are provided merely for convenience; they 
tell you nothing that you cannot discover from 
{cmd:st_vartype(}{it:var}{cmd:)}.


{title:Conformability}

{p 4 4 2}
{cmd:st_vartype(}{it:var}{cmd:)}:
{p_end}
	      {it:var}:  1 {it:x} 1
	   {it:result}:  1 {it:x} 1

{p 4 4 2}
{cmd:st_isnumvar(}{it:var}{cmd:)},
{cmd:st_isstrvar(}{it:var}{cmd:)}:
{p_end}
	      {it:var}:  1 {it:x} 1
	   {it:result}:  1 {it:x} 1


{title:Diagnostics}

{p 4 4 2}
All functions abort with error if {it:var} is not a valid Stata variable.


{title:Source code}

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


{title:Also see}

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

{p 4 13 2}
Online:  help for 
{bf:{help m4_stata:[M-4] stata}}
{p_end}