skipping lines in double array

Hello all, I have a double array which contains data for date time and related parameters of it. The question is how to skip lines in it? I want to select the data (according to months) not sequentially for 3 sets:

 1- for months 1,2,3,4,5,8,10

 2- 6,7,9

 3- 11,12

the dimensions are:

 744 for 1,3,5,7,8,10,12

 672 for 2

 720 for 4,6,9,11

thank you for your help in advance.

[Walter Roberson]

double arrays cannot contain strings.

Answer 1

[dpb]

How's the date stored? If you have month,day,year and want rows of a given set of months, then select the ones desired by ismember or any other equivalent operation...trivial example assuming an array 'x' with yr,mo,da,data... as the columns in order

sel={[1:5,8,10];[6 7 9];[11 12]}; % define the grouping month values
for i=1:length(sel)               % for each group
  z=x(ismember(x(:,2),sel{i}),:); % select rows according to the group 
  % do whatever is wanted here with the selection...
  ...
end

[Lilya]

dpd, It's a serial date number (duodenum). thus, it is not including no. Of months individually (day month year)

[dpb]

Well then first use datevec on it to get the [y,m,d] vectors.