[Scilab-users] need a little help

[Samuel Gougeon]

Hello Phil,

This should work:

--> [A,B] = ndgrid(rand(1,1000), rand(1,10000));  // test's data
--> size(A)
  ans  =
    1000.   10000.
--> [v, i] = min(abs(A-B));

The minimal distances are in v, the index of the closest in B are in i.

Regards
Samuel

Le 15/02/2019 à 21:46, P M a écrit :
> Hi experts,
>
> my problem is (I guess) a very common thing, but I somehow get stucked.
>
> I aim to find the nearest position of ANY value in array_1 to ANY 
> position in array_2.
>
> e.g.:
>
> A = array of doubles with 1000 elements.
> B = array of doubles with 10'000 elements.
>
> for each element of A I want to know it's nearest value in B.
> Also I want to know the index of the nearest value in B.
>
> I could do it in a bunch of for-loops, but this is way to slow, since 
> this loops 1000 values against 10'000 values of B.
>
> something like this:
>
> nearesVal   = zeros(1000);
> distIndex    = zeros(1000);
>
> for i=1:1000
>   d = 1000000; // just a rediculous big number that is much greater 
> than max(A) & max(B)
>   for j = 1:10000
>      act_dist = abs( A(i) - B(j) );     // actual minimal distance
>      if act_dist <= d
>         d = act_dist;
>         nearestVal(i) = B(j);
>         distIndex(i)  = j;
>       end
>    end
> end
>
> I do not have Scilab at hand, while I am writing this, but it looks 
> like it should work :-)
>
> Thanks
> Phil
>
>
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