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From: | Rik |
Subject: | [Octave-bug-tracker] [bug #36932] Automatic complex->real narrowing removes Diagonal property from matrix |
Date: | Mon, 23 Jul 2012 20:35:13 +0000 |
User-agent: | Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:13.0) Gecko/20100101 Firefox/13.0.1 |
URL: <http://savannah.gnu.org/bugs/?36932> Summary: Automatic complex->real narrowing removes Diagonal property from matrix Project: GNU Octave Submitted by: rik5 Submitted on: Mon 23 Jul 2012 01:35:13 PM PDT Category: Interpreter Severity: 3 - Normal Priority: 5 - Normal Item Group: None Status: None Assigned to: None Originator Name: Originator Email: Open/Closed: Open Discussion Lock: Any Release: dev Operating System: GNU/Linux _______________________________________________________ Details: As a result of narrowing, the Diagonal property of a matrix is lost and the result is cast to a full matrix which unnecessarily increases storage requirements. Example code: a = diag ([1+i 2 3]) a = Diagonal Matrix 1 + 1i 0 0 0 2 + 0i 0 0 0 3 + 0i octave:8> whos a Variables in the current scope: Attr Name Size Bytes Class ==== ==== ==== ===== ===== c a 3x3 48 double Total is 9 elements using 48 bytes a(1) = 1 a = 1 0 0 0 2 0 0 0 3 octave:12> whos a Variables in the current scope: Attr Name Size Bytes Class ==== ==== ==== ===== ===== a 3x3 72 double Total is 9 elements using 72 bytes _______________________________________________________ Reply to this item at: <http://savannah.gnu.org/bugs/?36932> _______________________________________________ Message sent via/by Savannah http://savannah.gnu.org/
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