Re: senseless warning in octave-3.6.2

[Sergei Steshenko]

----- Original Message -----
> From: Przemek Klosowski <address@hidden>
> To: address@hidden
> Cc: 
> Sent: Friday, July 6, 2012 4:29 PM
> Subject: Re: senseless warning in octave-3.6.2
> 
> On 07/03/2012 11:14 AM, Sergei Steshenko wrote:
> 
>>  So, vector differentiation depending on row/column property can 
> _definitely_ be abandoned - as the above example shows.
>> 
>>  Instead Octave developers in their "infinite wisdom" introduce 
> outlandish
>> 
>>  row_vec OP col_vec -> matrix
>> 
>>  behavior and even make it default.
> 
> There are three possible behaviors:
> 
> - inner product:     vector OP vector -> scalar
> - element-by-element     vector OP vector -> vector
> - outer product        vector OP vector' -> matrix
> 
> Every one of them is useful in some circumstances. Matlab language didn't 
> really provide outer product, and broadcast fixes that, so what's not to 
> like? Just about the only criticism I'd accept is that it's easier to 
> make mistakes by inadvertently triggering broadcast operations, but since you 
> can turn it off if you know you are not intending to use it, there's no 
> harm.
> 
> On the other hand, many calculations can be expressed much more simply with 
> the 
> broadcast primitive.
> 
> To step back a little, this discussion reminds me of the phrase "Who moved 
> my cheese !?". There is a short and sweet book by that title, about how to 
> learn to embrace change in our fast-paced world:
> I
> http://lifetofullest.com/who-moved-my-cheese/
> 
> Whenever I feel buffeted by unexpected change, like Sergei  in this case, I 
> cheer myself up by remembering this idiom.
> 
> 
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Oh G-d !

Again:

"
octave:1> foo = [1 2 3 4]
foo =

   1   2   3   4

octave:2> bar = [5 6 7 8]'
bar =

   5
   6
   7
   8

octave:3> foo .* bar
warning: product: automatic broadcasting operation applied
ans =

    5   10   15   20
    6   12   18   24
    7   14   21   28
    8   16   24   32

octave:4>
".

I have _explicitly_ requested element by element operation by using '.*' and 
_not_ plain '*'.

As a result I'm getting a _matrix_ and not a vector. _Exactly_ because I 
_explicitly_ requested element by element operation on two vectors and instead 
of a vector I got a matrix it is a _bug_.

Regards,
  Sergei.


>