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From: | anonymous |
Subject: | [Octave-bug-tracker] [bug #34145] need for ifdef test |
Date: | Sat, 27 Aug 2011 00:03:02 +0000 |
User-agent: | Mozilla/5.0 (X11; U; Linux i686; en-GB; rv:1.9.2.20) Gecko/20110822 Gentoo |
URL: <http://savannah.gnu.org/bugs/?34145> Summary: need for ifdef test Project: GNU Octave Submitted by: None Submitted on: Sat 27 Aug 2011 12:03:01 AM UTC Category: None Severity: 3 - Normal Priority: 5 - Normal Item Group: Feature Request Status: None Assigned to: None Originator Name: Originator Email: Open/Closed: Open Discussion Lock: Any Release: 3.4.0 Operating System: Any _______________________________________________________ Details: It seems there is not direct way to test whether a variable has been defined or not. Since both NA and NaN are actually assigned values it does not seem there is a basic test for unassigned variables. A work around is a try... catch structure around an attempt to reference the variable but it's a bit messy . isdef(varname) could be cleaner unless I'm missing a trick. try i=i; catch i=1; end_catch_try if ! isdef(i) i=1; OR isdef(i,1); # to provide a default value. _______________________________________________________ Reply to this item at: <http://savannah.gnu.org/bugs/?34145> _______________________________________________ Message sent via/by Savannah http://savannah.gnu.org/
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