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[Octave-bug-tracker] [bug #33219] logical() function does not accept (un
From: |
anonymous |
Subject: |
[Octave-bug-tracker] [bug #33219] logical() function does not accept (unsigned) integer input |
Date: |
Tue, 03 May 2011 14:19:12 +0000 |
User-agent: |
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:2.0.1) Gecko/20100101 Firefox/4.0.1 |
URL:
<http://savannah.gnu.org/bugs/?33219>
Summary: logical() function does not accept (unsigned)
integer input
Project: GNU Octave
Submitted by: None
Submitted on: Tue 03 May 2011 02:19:11 PM UTC
Category: None
Severity: 3 - Normal
Priority: 5 - Normal
Item Group: Improvement/Optimization
Status: None
Assigned to: None
Originator Name: Jochen Weber
Originator Email: address@hidden
Open/Closed: Open
Discussion Lock: Any
Release: 3.4.0
Operating System: Mac OS
_______________________________________________________
Details:
Given that I'm writing code that reads/writes diverse file formats, some of
them contain parameter values stored as 32-bit (unsigned) integers, which yet
can only ever have values 0 (false) and 1 (true), which I then internally want
to handle as such (logical value).
Matlab accepts the following syntax, which fails in Octave:
filevalue = fread(fid, [1, 1], '*uint32');
storevalue = logical(filevalue);
A workaround is simple (but definitely seems run-time inefficient on first
glance):
filevalue = fread(fid, [1, 1], '*uint32');
storevalue = logical(double(filevalue));
or alternatively (not tested, but guessing this works also)
filevalue = fread(fid, [1, 1], 'uint32=>double');
storevalue = logical(filevalue);
Given that I use a function that interprets a text file containing the
information about the parameters to read/write from/to each file (depending on
the file format), I definitely wouldn't want to use the second construction as
my general syntax, as this would potentially require a large amount of extra
memory in case the read content is a large array of type uint8 or so.
_______________________________________________________
Reply to this item at:
<http://savannah.gnu.org/bugs/?33219>
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- [Octave-bug-tracker] [bug #33219] logical() function does not accept (unsigned) integer input,
anonymous <=
- [Octave-bug-tracker] [bug #33219] logical() function does not accept (unsigned) integer input, Rik, 2011/05/03
- Message not available
- [Octave-bug-tracker] [bug #33219] logical() function does not accept (unsigned) integer input on MacOS, Rik, 2011/05/04
- [Octave-bug-tracker] [bug #33219] logical() function does not accept unsigned integer input scalars, Jordi GutiƩrrez Hermoso, 2011/05/04
- [Octave-bug-tracker] [bug #33219] logical() function does not accept unsigned integer input scalars, Rik, 2011/05/04
- [Octave-bug-tracker] [bug #33219] logical() function does not accept unsigned integer input scalars, Jochen Weber, 2011/05/04
- [Octave-bug-tracker] [bug #33219] logical() function does not accept integer input scalars, Rik, 2011/05/04
- [Octave-bug-tracker] [bug #33219] logical() function does not accept integer input scalars, John W. Eaton, 2011/05/04