[Scilab-users] mean of elements corresponding element is "true"

[Samuel Gougeon]

Le 02/03/2018 à 16:54, Samuel Gougeon a écrit :
> Le 02/03/2018 à 16:40, fujimoto2005 a écrit :
>> In the attached code,"boolean_M" is a random Boolean matrix.
>> I want to get the average of each column of A whose corresponding element of
>> boolean_M has "true" as row vector x_V, but it does not work.
>> Where am I wrong?
>> n=10;
>> boolean_M=rand(n,n)>0.5;
>> disp(boolean_M)
>> A=rand(n,n);
>> disp(A);
>> x_V=mean(A(boolean_M),'r');
>
> Instead, you may use
> n  =  5;
> boolean_M  =  rand(n,n)>0.5
> A  =  grand(n,n,"uin",0,9)
> A(boolean_M)  =  %nan
> nanmean(A,"r")
> --> n = 5;
> --> boolean_M = rand(n,n)>0.5
>  boolean_M  =
>   T F F F T
>   T T T T T
>   T T F T T
>   F T F T F
>   F F T T F
>
> --> A = grand(n,n,"uin",0,9)
>  A  =
>    6.   2.   5.   4.   6.
>    6.   9.   3.   6.   5.
>    3.   9.   3.   5.   4.
>    0.   8.   7.   0.   7.
>    1.   6.   8.   7.   2.
>
> --> A(boolean_M) = %nan

or
--> A(~boolean_M) = %nan

to stick to your requirement


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