Comments for Greg's Research

Comment on Subsetting made easy by Gregor

Gregor — Thu, 08 Mar 2012 20:59:30 +0000

This is an excellent addition! Thanks!

Comment on Subsetting made easy by Chris

Chris — Fri, 02 Mar 2012 03:22:30 +0000

Sometimes you need to create a row filter that you can use repeatedly across many data frames. To do this you can create the filter expression as a string, then evaluate it in the call to subset, like this:
base_fltr <- "model == base" b_all<- subset(all, subset=eval(parse(text=base_fltr)) ) b_some<- subset(some, subset=eval(parse(text=base_fltr)) )

This can be quite handy if you store many filters in a list, then use the filters to process all the subsets using an iterator or one of the apply functions.

Comment on Subsetting made easy by Adam Hyland

Adam Hyland — Tue, 28 Feb 2012 05:23:02 +0000

Also if you read the documentation for subset() they suggest mostly using it for interactive sessions and if you plan to write a function/script to use the built in methods (such as `$`, `[`, `[[`).

Comment on Subsetting made easy by Yang Zhao

Yang Zhao — Mon, 27 Feb 2012 17:26:13 +0000

you do not need the second ‘all$’ in the subset call, the subset expression is evaluated in the dataframe.

Comment on Fixed: Unable to plot a decent x-Axis in a time series plot using zoo by Gregor

Gregor — Fri, 17 Jun 2011 02:25:40 +0000

Thank you! I will check this out for sure.

Comment on Fixed: Unable to plot a decent x-Axis in a time series plot using zoo by Pat Burns

Pat Burns — Thu, 16 Jun 2011 17:45:09 +0000

An alternative (but unpolished) way of getting better time axes is to use 'pp.timeplot' which you can get via: > source('http://www.portfolioprobe.com/R/blog/pp.timeplot.R') You can see examples of that function in action in the blog posts: http://www.portfolioprobe.com/2011/02/08/4-and-a-half-myths-about-beta-in-finance/ and http://www.portfolioprobe.com/2010/12/06/bear-hunting/

Comment on Unable to plot a decent x-Axis in a time series plot using zoo by Fixed: Unable to plot a decent x-Axis in a time series plot using zoo | Greg's Research

Thu, 16 Jun 2011 14:25:53 +0000

[...] Link to the original problem This entry was posted in research. Bookmark the permalink. ← Boxplots without boxes [...]

Comment on Some details about Alert … by Outlining the next manuscript | Greg's Research

Outlining the next manuscript | Greg's Research — Thu, 14 Apr 2011 00:03:39 +0000

[...] 2 manuscripts under review I started outlining the next manuscript about my field trip to Alert. After several oral presentations and 2 posters one some aspects of my results the material has [...]

Comment on Converting text files with sed by Greg

Greg — Fri, 18 Mar 2011 12:44:26 +0000

Yup, even in between “code” tags. Weird.

Comment on Converting text files with sed by gregoa

gregoa — Thu, 03 Mar 2011 21:18:20 +0000

*gnarf*
wordpress really compresses multiple spaces into one.

my file one should read as
abcde