[Scilab-users] surf and %nan

[sgougeon at free.fr]

>It is not the most compact form but I think there is no issue with original syntax proposed:
>[a,b]=find(M==-999);
>M(a,b) = %nan;

In the M(a,b) syntax, a stands for the indices of selected ROWS, and b for the vector of selected COLUMNS, no matter about the fact that a and b have here the same length and then could be -- erroneously -- considered as respective elementwise indices.
This is why linearized indices must be used, as returned by i = find(..).

--> m = int8(grand(5,5,"uin",0,9))
 m  = 
  2  1  5  0  9
  2  9  5  9  9
  4  5  0  4  3
  5  8  6  7  9
  4  3  9  6  6


--> m([2 3 5],[1 2 4])
 ans  =
  2  9  9
  4  5  4
  4  3  6


--> m([2 3 5]',[1 2 4]')
 ans  =
  2  9  9
  4  5  4
  4  3  6

BR