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Scilab help >> Scilab > Variables > isdef

isdef

checks variable existence

Calling Sequence

isdef(name [,where])

Arguments

name

a character string

where

an optional character string with default value 'all'

Description

isdef(name) returns %T if the variable named name exists and %F otherwise.

Caveats: a function which uses isdef may return a result which depends on the environment!

isdef(name,'local') returns %T if the variable named name exists in the local environment of the current function and %F otherwise.

isdef(name,'nolocal') returns %T if the variable named name exists in the full calling environment (including the global level) of the current function and %F otherwise.

Examples

A=1;
isdef('A')
clear A
isdef('A')

function level1()
  function level2()
    disp(isdef("a","all"));
    disp(isdef("a","local"));
    disp(isdef("a","nolocal"));
  endfunction
  level2()
endfunction
function go()
  a=1;
  level1()
endfunction
go()

See Also

  • exists — checks variable existence
  • isglobal — check if a variable is global
  • whereis — name of library containing a function
  • type — returns the type of a variable
  • typeof — object type
  • clear — kills variables
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Last updated:
Mon Oct 01 17:34:35 CEST 2012