# bug #36536: str2double is case-sensitive

 Submitted by: Philip Nienhuis Submitted on: Thu 24 May 2012 09:57:17 PM UTC Category: Libraries Severity: 3 - Normal Priority: 5 - Normal Item Group: Matlab Compatibility Status: In Progress Assigned to: Rik Originator Name: Philip Nienhuis Open/Closed: Closed Release: dev Operating System: Any

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## Discussion

Wed 30 May 2012 12:46:39 AM UTC, comment #4:

I have made str2double case-insensitive for 'inf' which matches Matlab behavior here (http://hg.savannah.gnu.org/hgweb/octave/rev/a08f6e17336e).  Closing report.

Rik <rik5>
Sat 26 May 2012 03:42:39 PM UTC, comment #3:

>> ver

MATLAB Version 7.4.0.287 (R2007a)

>> str2double ('I')

ans =
NaN

>> str2double ('2I')

ans =
NaN

>> str2double ('2*I')

ans =
NaN

>> str2double ('I + 2*I')

ans =
NaN

>> str2double ('I + inf*i')

ans =
NaN

>> str2double ('i + inf*i')

ans =
NaN

>>

NOTE this is r2007a which was quite buggy. OTOH it gives the same answers to the calls in comment #1.

Philip Nienhuis <philipnienhuis>
Sat 26 May 2012 04:18:16 AM UTC, comment #2:

I have a patch that implements most of this, but I want to know if Matlab handles a capital 'I' for the imaginary unit.  Can you try the following?

str2double ('I')
str2double ('2I')
str2double ('2*I')
str2double ('1 + 2*I')
str2double ('1 + inf*i')

Rik <rik5>
Fri 25 May 2012 12:01:59 PM UTC, comment #1:

ML r2009a has this to say:

>> str2double ('inf')

ans =
Inf

>> str2double ('iNF')

ans =
Inf

>> str2double ('Inf')

ans =
Inf

>> str2double ('INF')

ans =
Inf

>> str2num ('inf')

ans =
Inf

>> str2num ('iNF')

ans =
[]

>> str2num ('Inf')

ans =
Inf

>> str2num ('inF')

ans =
[]

>> str2num ('InF')

ans =
[]

>>  str2num ('INF')

ans =
[]

so it seems the situation is a bit reversed compared to Octave: str2double is case-INsensitive while str2num is.

I'd vote for making at least str2double ML-compatible.

Philip Nienhuis <philipnienhuis>
Thu 24 May 2012 09:57:17 PM UTC, original submission:

octave-3.6.1:1> str2double ('Inf')
ans = Inf
octave-3.6.1:2> str2double ('inf')
ans = NaN
octave-3.6.1:3> str2double ('NaN')
ans = NaN
octave-3.6.1:4> str2double ('Naa')
ans = NaN
octave-3.6.1:5> str2num ('Inf')
ans = Inf
octave-3.6.1:6> str2num ('inf')
ans = Inf

Obviously str2double returns NaN for any read "error".
But that it is case-sensitive while str2num is not, is inconsistent.

I don't have ML at hand at the moment, but IIRC in ML both str2num and str2double are case-INsensitive. Can someone check, please?

Philip Nienhuis <philipnienhuis>

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