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indexing surprise
Posted:
Aug 3, 2011 10:52 AM
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Hello colleagues,
i'm now into debugging for some time (~ 1h) until i recognized that Matlab
has a quite surprising way of creating new variables.
And it goes something like this:
>> a
??? Undefined function or variable 'a'.
>> idx_new = [ 1 ; 2 ; 3];
>> size(idx_new)
ans =
3 1
>> net.bt = ones(6,1);
>> size(net.bt)
ans =
6 1
>> par.height = 10.5;
>> par.height(net.bt(idx_new))
ans =
10.5000
10.5000
10.5000
And now the punchline:
>> a(idx_new) = par.height(net.bt(idx_new))
a =
10.5000 10.5000 10.5000
so although my righthand side is a column vector and my index to a is a
column vector , the result in the new created a is a row vector.
There may be a good (almost very good reason) to do this, but for me
it came unexpected...
Wishing a happy day,
Andreas
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