Le 05/12/2018 à 13:01, Jens Simon Strom a écrit :
Hallo Scilab experts,
Given is a numeric vector x of length n and an index vector i with
max(i)=n. I want to insert a %nan after every x(i).
Example
x=[11:20]
i=[2 5 8]
Required result: y=[11 12 %nan 13 14 15 %nan 16 17 18 %nan 19 20]
How would you proceed so that it works fast for n>500000 too.
The following code does it:
x = 11:20;
i = [2 5 8];
// [11 12 13 14 15 16 17 18 19 20]
//Required result: y=[11 12 %nan 13 14 15 %nan 16 17 18 %nan 19 20]
nx = size(x,"*");
ni = size(i,"*");
o = ones(1,nx);
o(i+1) = 2;
newx = zeros(1,nx+ni);
newx(cumsum(o)) = x;
newx(i+(1:ni)) = %nan --> newx(i+(1:ni)) = %nan newx = 11. 12. Nan 13. 14. 15. Nan 16.
17. 18. Nan 19. 20.
Regards
Samuel
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