[Scilab-users] convert matlab code to scilab

[P M]

Dear Stephane,

thanks for your help.
I think in my case the problem is solved just by using:

[Minstances_hat] = unique(B(:));

This gives a vector of used px-values for different objects shown in image.
Each object is defined by a single pixel value.
Since B is the B-plane of an RGB-image, it is possible to assign each pixel
from the original image to an object using these values.

Thanks again,
Philipp


Am Mi., 16. Okt. 2019 um 13:27 Uhr schrieb Stéphane Mottelet <
stephane.mottelet at utc.fr>:

> Sorry, in my answer the loop constructs "ic", not  "ia", i.e. the full
> equivalent to Matlab's "[C,ia,ic] = unique(A)" is in Scilab:
>
> [C,ia] = unique(A)
> for i=1:length(A)
>     ic(i)=find(A(i)==C)
> end
>
> S.
> Le 16/10/2019 à 13:19, Stéphane Mottelet a écrit :
>
> Sorry, I thought you were just asking about the tildas, not the syntax of
> unique() in Scilab.
>
> Please see
>
> https://help.scilab.org/docs/6.0.2/en_US/unique.html
> <https://antispam.utc.fr/proxy/2/c3RlcGhhbmUubW90dGVsZXRAdXRjLmZy/help.scilab.org/docs/6.0.2/en_US/unique.html>
>
> vs
>
> https://fr.mathworks.com/help/matlab/ref/unique.html
> <https://antispam.utc.fr/proxy/2/c3RlcGhhbmUubW90dGVsZXRAdXRjLmZy/fr.mathworks.com/help/matlab/ref/unique.html>
>
> Matlab syntax [C,ia,ic] = unique(___)  with 3 outputs has no equivalent in
> Scilab. i.e. in Matlab, after  [C,ia,ic] = unique(A) then A=C(ic), i.e.
> values in ic are the indices of corresponding unique value in C.  They can
> be recovered with the quick and dirty following loop:
>
> for i=1:length(a)
>      ia(i)=find(a(i)==C)
> end
> S.
>
> Le 16/10/2019 à 12:10, P M a écrit :
>
> [ans,ans,Minstances_hat] = unique(B(:));
> gives:  Wrong number of output arguments.
>
> I also tried :
>
> [Minstances_hat] = unique(B(:));
>
> and get a vector.
> also
>
> [Minstances_hat,index] = unique(B(:));
>
> seem to work.
>
>
> However afterwards there is this line:
>
> masks = reshape(Minstances_hat-1,size(B));
>
> I try to convert via:
>
> mask = matrix(Minstances_hat-1,size(B));
>
> but no success.
>
>
>
>
>
>
> Am Mi., 16. Okt. 2019 um 11:50 Uhr schrieb Stéphane Mottelet <
> stephane.mottelet at utc.fr>:
>
>> Hello
>> Le 16/10/2019 à 11:46, P M a écrit :
>>
>> Dear experts,
>>
>> trying to convert a matlab code to scilab I come across following line:
>>
>> [~,~,Minstances_hat] = unique(B(:));
>>
>> How to replace the "~" symbol?
>>
>> by dummy names, e.g.
>>
>> [ans,ans,Minstances_hat] = unique(B(:));
>>
>> There is no equivalent mechanism in Scilab.
>>
>> B is the blue channel of a RGB image...hence a m x n matrix of integers (type(B) = 8 )
>>
>>
>> Thank you,
>>
>> Philipp
>>
>>
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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)344234688http://www.utc.fr/~mottelet <https://antispam.utc.fr/proxy/2/c3RlcGhhbmUubW90dGVsZXRAdXRjLmZy/antispam.utc.fr/proxy/1/c3RlcGhhbmUubW90dGVsZXRAdXRjLmZy/www.utc.fr/~mottelet>
>>
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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)344234688http://www.utc.fr/~mottelet <https://antispam.utc.fr/proxy/1/c3RlcGhhbmUubW90dGVsZXRAdXRjLmZy/www.utc.fr/~mottelet>
>
>
> _______________________________________________
> users mailing listusers at lists.scilab.orghttps://antispam.utc.fr/proxy/1/c3RlcGhhbmUubW90dGVsZXRAdXRjLmZy/lists.scilab.org/mailman/listinfo/users
>
> --
> 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)344234688http://www.utc.fr/~mottelet
>
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