[R] variable values
Hi all, I was working with some probabilities and wanted to store some small values. For example: > x = 2e-250 > x [1] 2e-250 > y = 2e-300 > y [1] 2e-300 > z = 2e-350 > z [1] 0 Is there any way to store a small value (e.g. 2e-350) in R? thanks! [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] variable values
Step 1: Read the R-FAQ 7.31: Step 2: Ask yourself whether it is likely that such a small value can be sensibly distinguished from zero using a program that stores values in double precision. Step 3: Consider alternate methods, perhaps logarithms or programs that are equipped to deal with arbitrary precision. There have been threads on such strategies. I got on-topic results with an r-search on : "very small" log probabilit* -- David Winsemius On Feb 12, 2009, at 2:09 PM, Tim Smith wrote: Hi all, I was working with some probabilities and wanted to store some small values. For example: x = 2e-250 x [1] 2e-250 y = 2e-300 y [1] 2e-300 z = 2e-350 z [1] 0 Is there any way to store a small value (e.g. 2e-350) in R? thanks! [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] variable values in plotmath expressions
## I would like help in using variable values in plotmath expressions
## in lattice
x <- 1:10
y <- 1:10
pval <- .95
plot(y ~ x, ## works as I want in base graphics
main=substitute(list(alpha * " = " * group("",list(p),"")),
list(p=pval)))
plot(y ~ x, ## doesn't work as intended: "pval" is displayed
main=substitute(list(alpha * " = " * group("",list(pval),""
try( ## doesn't work: object 'alpha' not found
xyplot(y ~ x,
main=substitute(list(alpha * " = " * group("",list(p),"")),
list(p=pval)))
)
xyplot(y ~ x, ## doesn't work as intended: "substitute" is displayed
main=expression(substitute(list(alpha * " = " * group("",list(p),"")),
list(p=pval
xyplot(y ~ x, ## doesn't work as intended: "p" is displayed and "pval" is
displayed
main=expression(list(alpha * " = " * group("",list(p),"")),
list(p=pval)))
xyplot(y ~ x, ## doesn't work as intended: "pval" is displayed
main=expression(list(alpha * " = " * group("",list(pval),""
Thanks
Rich
[[alternative HTML version deleted]]
__
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
Re: [R] variable values in plotmath expressions
Hi Rich,
I'm not sure if you have a reason outside this toy example to want to
be using list() and group(), but if not I would go with this:
xyplot(y ~ x, main = substitute(expression(alpha == p), list(p = pval)))
Hope this helps,
Josh
On Thu, Mar 15, 2012 at 7:25 PM, Richard M. Heiberger wrote:
> ## I would like help in using variable values in plotmath expressions
> ## in lattice
>
> x <- 1:10
> y <- 1:10
> pval <- .95
>
> plot(y ~ x, ## works as I want in base graphics
> main=substitute(list(alpha * " = " * group("",list(p),"")),
> list(p=pval)))
>
> plot(y ~ x, ## doesn't work as intended: "pval" is displayed
> main=substitute(list(alpha * " = " * group("",list(pval),""
>
> try( ## doesn't work: object 'alpha' not found
> xyplot(y ~ x,
> main=substitute(list(alpha * " = " * group("",list(p),"")),
> list(p=pval)))
> )
>
> xyplot(y ~ x, ## doesn't work as intended: "substitute" is displayed
> main=expression(substitute(list(alpha * " = " * group("",list(p),"")),
> list(p=pval
>
> xyplot(y ~ x, ## doesn't work as intended: "p" is displayed and "pval" is
> displayed
> main=expression(list(alpha * " = " * group("",list(p),"")),
> list(p=pval)))
>
> xyplot(y ~ x, ## doesn't work as intended: "pval" is displayed
> main=expression(list(alpha * " = " * group("",list(pval),""
>
>
> Thanks
> Rich
>
> [[alternative HTML version deleted]]
>
> __
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
--
Joshua Wiley
Ph.D. Student, Health Psychology
Programmer Analyst II, Statistical Consulting Group
University of California, Los Angeles
https://joshuawiley.com/
__
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
Re: [R] variable values in plotmath expressions
On Thu, Mar 15, 2012 at 10:25 PM, Richard M. Heiberger wrote:
> ## I would like help in using variable values in plotmath expressions
> ## in lattice
>
> x <- 1:10
> y <- 1:10
> pval <- .95
>
> plot(y ~ x, ## works as I want in base graphics
> main=substitute(list(alpha * " = " * group("",list(p),"")),
> list(p=pval)))
>
> plot(y ~ x, ## doesn't work as intended: "pval" is displayed
> main=substitute(list(alpha * " = " * group("",list(pval),""
>
> try( ## doesn't work: object 'alpha' not found
> xyplot(y ~ x,
> main=substitute(list(alpha * " = " * group("",list(p),"")),
> list(p=pval)))
> )
>
> xyplot(y ~ x, ## doesn't work as intended: "substitute" is displayed
> main=expression(substitute(list(alpha * " = " * group("",list(p),"")),
> list(p=pval
>
> xyplot(y ~ x, ## doesn't work as intended: "p" is displayed and "pval" is
> displayed
> main=expression(list(alpha * " = " * group("",list(p),"")),
> list(p=pval)))
>
> xyplot(y ~ x, ## doesn't work as intended: "pval" is displayed
> main=expression(list(alpha * " = " * group("",list(pval),""
Try bquote with classic graphics or as.expression(bquote(...)) with lattice:
plot(y ~ x, main = bquote(alpha == .(pval)))
xyplot(y ~ x, main = as.expression(bquote(alpha == group("", .(pval) ,""
--
Statistics & Software Consulting
GKX Group, GKX Associates Inc.
tel: 1-877-GKX-GROUP
email: ggrothendieck at gmail.com
__
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
