gap size

Calculates number of consequtive NaNs in a vector.

USAGE: sz=gapsize(x)

EXAMPLE:
x=rand(20,1);
x(x>.5)=nan;
[x gapsize(x)]

--------------
ans =
NaN 2
NaN 2
0.33311 0
0.28511 0
0.38263 0
0.20227 0
0.37058 0
0.43658 0
NaN 1
0.0049841 0
NaN 1
0.015303 0
NaN 1
0.26592 0
NaN 4
NaN 4
NaN 4
NaN 4
0.20113 0
NaN 1