[scilab-Users] min/max with NaN values

[Mathieu Dubois]

Hello Fred,

I agree with you this sounds strange.

If one tries:
min([1 2 3 %nan])
the result is 1 as expected.

As a workaround, you can try to stack your matrices in a hypermatrix:
d=hypermat([2, 2, 3]); // We have 3 2x2 matrices
d(:, :, 1)=a;
d(:, :, 2)=b;
d(:, :, 3)=c;
min(d, 3)

Alternatively there is a function called nanmean but you cannot use the 
nanmin( a, b, c) syntax.

HTH,
Mathieu

On 11/24/2010 10:11 AM, Frederic Jourdin wrote:
> Hi all !
> if I run this:
>
> a= [    1, %nan;    4,    4];
> b= [ %nan,    3;    3,    6];
> c= [    2,    2; %nan, %nan];
> min( a, b, c)
>
> Scilab returns the following matrix:
> NaN  NaN
> NaN  NaN
>
> while the expected matrix should be:
> 1  2
> 3  4
>
> Why?
>
> thanks
> Fred
>
> Scilab 5.3.0.beta3 on Linux
>