The | symbol has a completely different meaning in R syntax than it has in
regular expression syntax. R hands of pattern strings to the regex library
without looking inside the strings any more than it has to. Likewise, the
regex library has no clue about R syntax. Your attempt failed to create a
character string for grep to give to the regex library. To do that read
?paste.
grep( paste( z, v, sep = "|" ), a )
On Thu, 22 Sep 2016, Fix Ace via R-help wrote:
Hello, there,
My patterns are defined by variables, for example:z="h"v="x"
I have a vector:
a=c("th","mx","t")
I would like to find elements in vector a that contain either "h", or "x"
grep("h|x", a) apparently works. However, when I tried: grep(z|v,a), it did not
work. Can anyone help how to handle such situation?
Thanks.
Ace
On Wednesday, March 18, 2015 5:52 PM, Fix Ace <ace...@rocketmail.com> wrote:
Thank you very much!
I do need to learn more about R!!
On Tuesday, March 17, 2015 9:26 PM, William Dunlap <wdun...@tibco.com>
wrote:
Fix Ace wrote What is the default "n"?
512: > length(density(rnorm(10^6))$x) [1] 512 > args(density.default) function (x, bw = "nrd0", adjust = 1, kernel = c("gaussian",
"epanechnikov", "rectangular", "triangular", "biweight", "cosine", "optcosine"), weights = NULL,
window = kernel, width, give.Rkern = FALSE, n = 512, from, to, cut = 3, na.rm = FALSE, ...) NULL > ?density # or ?density.default, should also tell
you about its meaning
Bill Dunlap
TIBCO Software
wdunlap tibco.com
On Tue, Mar 17, 2015 at 7:02 PM, Fix Ace <ace...@rocketmail.com> wrote:
Thank you for the email.
What is the default "n"?
Thanks!
On Tuesday, March 17, 2015 4:06 PM, William Dunlap <wdun...@tibco.com>
wrote:
Increasing the value of 'n' given to density will give an estimate at more
points so it will look smoother. Try n=2^18.
Bill Dunlap
TIBCO Software
wdunlap tibco.com
On Tue, Mar 17, 2015 at 12:06 PM, Fix Ace <ace...@rocketmail.com> wrote:
I have a dataset with 6187 elements, ranged from 3 to 104028. When I tried to
examine only small range of data, I found that the plot was not smooth (as
shown below):
plot(density(test$V2), xlim=c(0,1000))
Is there away to make it smoother?
Thanks a lot!!
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