Delete NAN + following x values

I have a matrix containing instrument data. Every, lets say, 20 minutes it has a baseline, recorded as NAN followed by some "flushing" values (not useful data). Is there a way I can program Matlab to do something like "find the first NAN of a sequence and delete the next 70 rows? Thank you so much in advance.

Answer 1

[KSSV]

A = rand(10,3) ;  % some random data 
A(7,:) = NaN ;   % introduce NaN 
idx = find(isnan(A)) ;  % find the positions of NaN's
% first row where Nan occurs 
row1 = idx(1) ;
% remove the  rows
A(row1:end,:) = []

[Julia Perim de Faria]

Thanks! This works for the first occurrence of the NAN. How can I make it a loop, so it deletes all the occurrence (for example I have a daily file with baseline occurrence every 20 minutes or so).

[KSSV]

The number of rows you want to delete after NaN are always fixed?