Skipping numbers in lists in Mathematica

[laminatedevildoll]

Hi,

I am new to mathematica, and part of the program I have to write includes reading a file and manipulating the data for research. This file has around 22,000 numbers listed in it. I've already figured out how to look at those numbers and generate a histogram. However, what if I want to skip over numbers, meaning that now I want to read every 256th number until the end of my data set and save it each time under the same name, i.e data1, so I can generate a new histogram with these numbers. I've already tried the takedata option, without much luck.

I'd appreciate any help.

 

[PerennialII]

One simple way to do it would be to write a For [ ] - loop over your data with the appropriate incrementation and writing the operation (the save) in the body of the for-statement.

 

[laminatedevildoll]

Okay, I figured out how to skip numbers by using a Do loop.

Here's my code so far...

data = BinaryReadList[file,"Integer16"]
lngth = Length[data]
stepsize = 255
numiter = IntegerPart[lngth/stepsize]
initobs=1
data1={}
Do[data1=Append[data1,data[[i]]], {i,initobs,numiter*stepsize,stepsize}]
Readlist[data1]

However, I need to evaluate this 256 times where initobs = 1,2...256. I tried to put this whole expression in a do loop, so that it could output 256 different list for different values of initobs, but it doesn't work. What am I doing wrong?