cell array indexing with logical index bug?

[Ben Abbott]

On Nov 2, 2008, at 1:19 AM, Jaroslav Hajek wrote:

> On Sat, Nov 1, 2008 at 11:54 PM, Thorsten Meyer <thorsten.meyier at gmx.de 
> > wrote:
>> Hi,
>>
>> with octave built from the current tip I get:
>>
>>
>> octave:1> a{1}=1
>> a =
>>
>> {
>> [1,1] =  1
>> }
>>
>> octave:2> a(1)=[]
>> a = {}(1x0)
>> octave:3> a{1}=1
>> a =
>>
>> {
>> [1,1] =  1
>> }
>>
>> octave:4> a(1==1)=[]
>> error: A(I): Index exceeds matrix dimension.
>> octave:4> a{1}=1;a{2}=2;
>> octave:5> a(1==1)=[]
>> a =
>>
>> {
>> [1,1] =  2
>> }
>> octave:6> a{1}=1;a{2}=2;
>> octave:7> a([1 2])=[]
>> error: A(I): Index exceeds matrix dimension.
>>
>> So I can empty a cell array indexing with single index of type  
>> double, but not with a single index
>> of type logical. If the index is a vector, it does not matter if it  
>> is double or logical.
>>
>> I am not sure if this is a bug. Imho, it is at least a misfeature:  
>> e.g., when I want to eliminate
>> entries of a by a certain criterion, i could do:
>> idx = cellfun (@(x) x>0, a);
>> a(idx) = [];
>> But with the above behaviour I have to specially treat the case  
>> that all elements of a fulfil the
>> criterion.
>>
>> regards
>>
>
> Though I can't reproduce it, please try this patch:
> http://hg.savannah.gnu.org/hgweb/octave/rev/f7d44b6a74df
>
> regards

I just can verify this behavior exists on Mac OSX . My tip is

changeset:   8300:4b9bce36109b
tag:         tip
user:        David Bateman <dbateman at free.fr>
date:        Fri Oct 31 17:41:57 2008 +0100
summary:     Add constraint for logical image cdata

I'll pull and build again.

Ben