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[Octave-bug-tracker] [bug #52953] reshaping "complex(0, 0)" should not m
From: |
Colin Macdonald |
Subject: |
[Octave-bug-tracker] [bug #52953] reshaping "complex(0, 0)" should not make it real |
Date: |
Mon, 22 Jan 2018 14:34:56 -0500 (EST) |
User-agent: |
Mozilla/5.0 (X11; Fedora; Linux x86_64; rv:57.0) Gecko/20100101 Firefox/57.0 |
URL:
<http://savannah.gnu.org/bugs/?52953>
Summary: reshaping "complex(0,0)" should not make it real
Project: GNU Octave
Submitted by: cbm
Submitted on: Mon 22 Jan 2018 07:34:55 PM UTC
Category: Interpreter
Severity: 3 - Normal
Priority: 5 - Normal
Item Group: Incorrect Result
Status: None
Assigned to: None
Originator Name:
Originator Email:
Open/Closed: Open
Discussion Lock: Any
Release: dev
Operating System: GNU/Linux
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Details:
1. I would not expect reshape and "(:)" to change the type of my data.
2. But currently "complex(0,0)" and "complex(-0, -0)" become real when
reshaped.
3. Many functions (e.g., special functions) reshape their input before
processing. These functions are one of major reasons we have signed zero. So
if their result depends on signed zero, they cannot get it right.
4. This is also a Matlab compatibility issue (not that I recommend blindly
emulating Matlab's treatment of signed zeros). I have confirmed that Matlab
R2014a does not change the type on reshape.
5. I will attach some BIST once I have the bug number.
_______________________________________________________
Reply to this item at:
<http://savannah.gnu.org/bugs/?52953>
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- [Octave-bug-tracker] [bug #52953] reshaping "complex(0, 0)" should not make it real,
Colin Macdonald <=