Please note that the recommended version of Scilab is 2024.1.0. This page might be outdated.
See the recommended documentation of this function
exists
checks variable existence
Syntax
ve = exists(name [,where])
Arguments
- ve
a matrix with the same size as
name
with possible values:1
if true,0
if false- name
a matrix of character strings
- where
an optional character with possible values:
'l'
(local),'n'
(nolocal) and'a'
(all). The default value is'a'
.
Description
exists(name)
returns 1
if the
variable named name
exists and 0
otherwise.
Caveats: a function which uses exists
may return
a result which depends on the environment!
exists(name,'l')
returns 1
if the variable named name
exists in the environment of
the current function and 0
otherwise.
exists(name,'n')
returns
1
if the variable named name
exists
in any level of the calling environment (including the Scilab shell main level) of the current function and
0
otherwise.
![]() | Warning: the exists function does not check if a variable exists in
the global namespace. |
Examples
exists("myNotLikelyToExistVar") myNotLikelyToExistVar = 1; exists("myNotLikelyToExistVar")
deff('foo(x)',.. ['disp([exists(''a12''),exists(''a12'',''l'')])' 'disp([exists(''x''),exists(''x'',''l'')])']) foo(1) a12=[];foo(1) function level1() function level2() disp(exists(["a","b"],"a")); disp(exists(["a","b"],"l")); disp(exists(["a","b"],"n")); endfunction level2() endfunction function go() a=1; level1() endfunction go()
See also
- isdef — checks variable existence
- isglobal — checks if a local variable has a global counterpart
- whereis — Returns the name of the loaded library/module a given function belongs to
- type — returns the type of a Scilab object
- typeof — explicit type or overloading code of an object
- macrovar — variables of function
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