[Octave-bug-tracker] [bug #31764] logical indexing regression 3.0.1 vs 3.2.4 (also dev) - differs from Matlab

[jkirby]

URL:
  <http://savannah.gnu.org/bugs/?31764>

                 Summary: logical indexing regression 3.0.1 vs 3.2.4 (also
dev) - differs from Matlab
                 Project: GNU Octave
            Submitted by: jkirby
            Submitted on: Fri 03 Dec 2010 01:53:24 AM GMT
                Category: None
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: None
                  Status: None
             Assigned to: None
         Originator Name: jkirby
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 3.2.4
        Operating System: Microsoft Windows

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Details:

this script correctly returns geo = 0.62970 in 3.0.1 and Matlab 2010a but
"error: A(I,J,...) = X: dimensions mismatch" in 3.2.4 and 3.3.54+ 

geo = [0.6297] 
c2 = [0.6562] 

ic2 = (c2 < 0.3) 
c = [0.8082] 
geo (1,ic2) = acos(c(ic2)) 


this is on a windows build in all three cases.

Also (reported from:
http://octave.1599824.n4.nabble.com/logical-indexing-regression-3-0-1-vs-3-2-4-td3067780.html)

Yes, in a GNU/Linux build in 3.2.4 and current tip. In current tip 
(your script reduces to the first two lines): 

octave:1> a = 1; 
octave:2> a(1, false) = acos ([]) 
error: A(I,J,...) = X: dimensions mismatch 
octave:2> a(1, false) = zeros (0, 0) 
error: A(I,J,...) = X: dimensions mismatch 

but weirdly: 

octave:2> a(1, false) = [] 
error: A null assignment can only have one non-colon index. 
octave:2> a(1, false) = zeros (1, 0) 
a =  1 
octave:3> a(1, false) = zeros (0, 1) 
a =  1 
octave:4> a(1, false) 
ans = [](1x0) 
octave:5> 




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