Extracting data from a matrix of unknown size

I have created a matrix "Intervals" from an acceleration signal. The matrix contains time stamps of intervals that I want to extract from the full signal output, based on characteristics of the signal. Column 1 is the start point for each interval, Column 2 is the end point.

Intervals=

       28868       44034
       48111       66203
       69134       87427
       90604       94399
       97422      101333
      104292      108044
      111269      114862
      120068      137008

So, for example I want to create a new matrix called "Interval_1" and this first interval goes from samples 28868:44034. "Interval 2" will be from 48111:66203 and so on. I will use these intervals to chop up my original signal for further analysis.

My problem is that I won't know how large my Intervals matrix will be - it will always contain 2 columns but may have any number of rows depending on the original signal.

So I am looking for a way of extracting each row's values and assigning them to "Interval_1, Interval_2, ..., Interval_N, where N is the number of rows.

I am trying to do this with for loops but with no joy as yet.

Thanks for your help, Robert

Answer 1

[Walter Roberson]

Don't do that. Use a cell array instead.

http://matlab.wikia.com/wiki/FAQ#How_can_I_create_variables_A1.2C_A2.2C....2CA10_in_a_loop.3F