How to delete select rows of data that are non-uniform?

I have a 4096x32 data set and I need to delete rows of data. For example Keep rows 1-32 Delete rows 33-83 Keep rows 84-116. I have a code do to this but this issue is that the number of I need deleted goes in the pattern 50-50-51. Anybody know how to do this?

Answer 1

[Cedric]

Build a vector of indices of all rows that you want to delete, and use it for performing a one-shot deletion. Don't iterate a deletions one row or block of rows at a time, as the size of your matrix would decreases each time rows are deleted, which generally invalidates pre-computed indices. Example:

 >> A = rand(5, 3)
 A =
    0.1233    0.9027    0.9001
    0.1839    0.9448    0.3692
    0.2400    0.4909    0.1112
    0.4173    0.4893    0.7803
    0.0497    0.3377    0.3897

 >> rIds = [2, 2, 2, 2, 5] ;       % Vector of ids of ALL rows to delete.
 >> A(rIds,:) = []
 A =
    0.1233    0.9027    0.9001
    0.2400    0.4909    0.1112
    0.4173    0.4893    0.7803

As you can see, this erased row 2 once only. A loop like

 for k = 1:numel(rowIds),  A(rowIds(k),:) = [] ;  end

would fail for the reason that I mentioned.

Answer 2

[Image Analyst]

You say " I have a code do to this". Do you have code to do this or not? What is "this"? You simply say:

data(row1:row2, :) = [];

for whatever row1 and row2 you want. I'm not sure what code you're missing and what you have.