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problems with latest strread (comma delimiters)
From: |
krthie |
Subject: |
problems with latest strread (comma delimiters) |
Date: |
Mon, 17 Oct 2011 17:04:10 -0700 (PDT) |
Hi
I'm trying to use textread but had trouble on Octave 3.4.2 (built from
source on Ubuntu 11.04). Therefore, I downloaded the latest strread.m and
textread.m from mercurial, renaming them to newstrread.m and newtextread.m.
(IMPORTANT: I didn't update anything else. That might be my mistake).
Indeed, the latest textread fixed my trouble (Thanks!), but I see weird
behaviour for strread.
> octave> [a1,a2]=newstrread("1,2\n3,4\n", '%f%f', 'delimiter',',')
> a1 =
> 1
> 4
> a2 =
> 23
> NaN
>
Somehow, the newline was not considered as a "new record" and just ignored.
Instead, the 3.2.4 version of strread reads this correctly:
> octave> [a1,a2]=strread("1,2\n3,4\n", '%f%f', 'delimiter',',')
> a1 =
> 1
> 3
> a2 =
> 2
> 4
>
Remarkably, writing the string to file and then reading it with (both 3.2.4
and new) textread works just fine.
> octave> f=fopen("test.csv","w");fprintf(f,"1,2\n3,4\n");fclose(f);
> octave> [a1,a2]=newtextread("test.csv",
> '%f%f','delimiter',',');assert(a1==[1;3]);assert(a2==[2;4])
>
Here's another case where both the 3.2.4 and new strread (and textread)
ignore some unknown characters, which causes rather strange results:
> octave> [a1,a2]=newstrread("1a2\n3,4", '%f%f')
> a1 = NaN
> a2 = 34
>
Arguably returning a NaN for the first line is ok, but ignoring the comma is
just wrong.
Thanks
Kris
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Sent from the Octave - General mailing list archive at Nabble.com.
- problems with latest strread (comma delimiters),
krthie <=
- Re: problems with latest strread (comma delimiters), PhilipNienhuis, 2011/10/18
- RE: problems with latest strread (comma delimiters), krthie, 2011/10/18
- RE: problems with latest strread (comma delimiters), PhilipNienhuis, 2011/10/19
- Re: problems with latest strread (comma delimiters), Ben Abbott, 2011/10/19
- Re: problems with latest strread (comma delimiters), Philip Nienhuis, 2011/10/19
- Re: problems with latest strread (comma delimiters), Ben Abbott, 2011/10/19
- RE: problems with latest strread (comma delimiters), krthie, 2011/10/21
- RE: problems with latest strread (comma delimiters), PhilipNienhuis, 2011/10/21