For Loop help condensing a matrix

Hello.

I created a large array called Hist that is (160x6) with my number of iterations over the length is in the 1st column. When a variable nSpans is equal to 4, I would be trying to pull out four specific lengths: L(1) - 1, L(2) - 1, L(3) - 1, and L(4) - 1, and what each other column is equal to in the rows that these occur.

Example, row 40 is where L(1) - 1 occurs and is shown below:

10.0000 2 -11.0714 -10.7143 0.2375 0.0030

How would I write a for loop for n=1:nSpans to do this? I basically just want to condense my Hist matrix to be (nSpans,6).

Let my know if anyone needs more information. Cheers.

[David Hill]

What is L? Why is row 40 length = L(1)-1?