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See the recommended documentation of this function
isdef
checks variable existence
Calling Sequence
ve = isdef(name [,where])
Arguments
- ve
a matrix with the same size as
name
with boolean values- name
a matrix of character strings
- where
character string, can be
'l'
(for"local"
),'n'
(for"nolocal"
) or'a'
(for"all"
). Default value is'a'
.
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, 'l')
returns %T
if the variable named name
exists in the local
environment of the current function and %F
otherwise.
isdef(name, 'n')
returns
%T
if the variable named name
exists
in the full calling environment (including the global level) of the
current function and %F
otherwise.
Note: only the first letter of option where is taken into account. |
Examples
A = 1; B = 2; C = 3; D = 4; isdef(['A', 'B'; 'C', 'D']) clear A, B, C, D; isdef(['A', 'B'; 'C', 'D']) function level1() function level2() disp(isdef(["a", "b"], "a")); disp(isdef(["a", "b"], "l")); disp(isdef(["a", "b"], "n")); endfunction level2() endfunction function go() a = 1; level1() endfunction go()
See Also
Report an issue | ||
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