Re: selecting columns from a list
- To: mathgroup at smc.vnet.net
- Subject: [mg47859] Re: [mg47844] selecting columns from a list
- From: Sseziwa Mukasa <mukasa at jeol.com>
- Date: Thu, 29 Apr 2004 03:05:03 -0400 (EDT)
- References: <200404281056.GAA12272@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
On Apr 28, 2004, at 6:56 AM, Edo wrote: > Hello > I just started with mathematica, wanted to load a comma separated data > file and drop the first two columns. So I did > data=Import["C:\Data\filename.ext","CSV"]; to get the file into a > variable "data", then I am stuck, after doing some reading in the help > files about Drop, Partition, Take. > etc > could someone tell me what to read and where to find info about > indexing > different data structures There are a few ways to do this. If you're data is in a nested list f two levels, then data[[All,Range[3,Last[Dimensions[data]]]]] represents data with the first two columns dropped. The appropriate help topics to understand this are Part, Dimensions and Last. Another expression of equivalent meaning is Drop[#,2]&/@data. You need to understand what Map means to comprehend this expression. Welcome to Mathematica. Regards, Ssezi
- References:
- selecting columns from a list
- From: Edo <eddoGrasho@edo.com>
- selecting columns from a list