[Scilab-users] {EXT} Help for . operator

[Perrichon]

Hello, and so much thanks for your response.

Stéphane enlightened me

If a and b are simple floating 1x1 then a^b is sufficient. a.^b does not need the "dot" operator

Nice day
Pierre

Before printing, think about ENVIRONMENTAL responsabity


-----Message d'origine-----
De : users <users-bounces at lists.scilab.org> De la part de Stéphane Mottelet
Envoyé : lundi 8 juin 2020 11:49
À : users at lists.scilab.org
Objet : Re: [Scilab-users] {EXT} Help for . operator

Hello,

The problem is the actual tolerance of Scilab which allows to omit the dot fot the power operator:

--> [1 2 3]^2
  ans  =

    1.   4.   9.

although Matlab does not allow it:

 >> [1 2 3]^2
Error using  ^
Incorrect dimensions for raising a matrix to a power. Check that the matrix is square and the power is a scalar. To perform elementwise matrix powers, use '.^'.

S.

Le 08/06/2020 à 11:21, Dang Ngoc Chan, Christophe a écrit :
> Hello Pierre,
>
>> De : Perrichon
>> Envoyé : lundi 8 juin 2020 11:07
>>
>> I don't understand le role of the « point » operator '.'
> The dot is used to have an element-wise operation.
>
> The difference is when you work with matrices, e.g. the product * will 
> make a matrix product
>
> C = A*B -> C(i, j) = sum_k (A(i, k), B(k, j))
>
> but .* will make the elementwise product
>
> C = A.*B -> C(i, j) = A(i, j)*B(i, j)
>
> See 
> https://antispam.utc.fr/proxy/2/c3RlcGhhbmUubW90dGVsZXRAdXRjLmZy/help.
> scilab.org/docs/6.1.0/en_US/dot.html
>
> regards
>
> --
> Christophe Dang Ngoc Chan
> Mechanical calculation engineer
>
>
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--
Stéphane Mottelet
Ingénieur de recherche
EA 4297 Transformations Intégrées de la Matière Renouvelable Département Génie des Procédés Industriels Sorbonne Universités - Université de Technologie de Compiègne CS 60319, 60203 Compiègne cedex Tel : +33(0)344234688 http://www.utc.fr/~mottelet

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