[R] how to pass multiple pattern varibles to grep()

[Fix Ace]

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 <acefix at 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 <wdunlap at 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 <acefix at rocketmail.com> wrote:

Thank you for the email.
What is the default "n"?
Thanks! 


     On Tuesday, March 17, 2015 4:06 PM, William Dunlap <wdunlap at 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 <acefix at 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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