Displaying 20 results from an estimated 30000 matches similar to: "variable values in plotmath expressions"
2003 Jan 24
4
new function: showcolors {base}
I propose to add a function that allows
to display colors selected by a text pattern
or by color vectors in a plot.
Wolfram Fischer
#--- showcolors.R
showcolors <-
function(
col = "red"
, index = NULL
, pie = TRUE
, lwd = 6
, cex = 1.0
, main = NULL
, sub = NULL
, ...
){
n.colors <- length( col )
if( n.colors > 1 ){
main <- deparse( substitute( col ) )
2004 Oct 04
11
inverse function of order()
I have:
d <- sample(10:100, 9)
o <- order(d)
r <- d[o]
How I can get d (in the original order), knowing only r and o?
Thanks - Wolfram
2002 May 03
2
sub() of matrix returns a vector and not a matrix
Is there a simple possibility
to become directly a matrix
from a call of sub() on a matrix?
--------- START OF LOGFILE ----------------
# R 1.4.1
> a <- matrix( letters[1:6], 2, 3 )
# a is a matrix
> print( a )
[,1] [,2] [,3]
[1,] "a" "c" "e"
[2,] "b" "d" "f"
> b <- sub( '(.)', '-\\1-', a )
2006 Nov 29
4
Why the factor levels returned by cut() are not ordered?
What is the reason, that the levels of the factor
returned by cut() are not marked as ordered levels?
> is.ordered( cut( breaks=3, sample(10 ) ) )
FALSE
> help(factor)
...
If 'ordered' is 'TRUE', the factor levels are assumed to be ordered.
...
Wolfram
2005 Apr 11
6
How to change letters after space into capital letters
What is the easiest way to change within vector of strings
each letter after a space into a capital letter?
E.g.:
c( "this is an element of the vector of strings", "second element" )
becomes:
c( "This Is An Element Of The Vector Of Strings", "Second Element" )
My reason to try to do this is to get more readable abbreviations.
(A suggestion would be to
2003 Aug 29
2
length() and nchar()
I would propose to add "
See also:
`nchar' for counting the number of character in
character vectors.
"
to the helpfile of length(),
because it is rather difficult
to find nchar() if one has only
search terms as "length", "len",
"strlen" in mind.
Sincerly
Wolfram Fischer
2004 Dec 07
1
how to test the existence of a name in a dataframe
I wanted to test if there exists already a name (which is
incidentally a substring of another name) in a dataframe.
I did e.g.:
> data(swiss)
> names(swiss)
[1] "Fertility" "Agriculture" "Examination" "Education"
[5] "Catholic" "Infant.Mortality"
> ! is.null(swiss$EduX)
[1] FALSE
> !
2006 Dec 08
1
lattice: defining an own function using args for "formula" and "groups"
x.fun <- function( formula, data ) dotplot( formula, data )
x.grp <- function( formula, groups, data ) dotplot( formula, groups, data )
data( barley )
> x.fun( variety ~ yield | site, data=barley )
# no problem
> dotplot( variety ~ yield | site, groups=year, data=barley )
# no problem
> x.grp( variety ~ yield | site, groups=year, data=barley )
object "year" not found
2005 Apr 15
4
function corresponding to map of perl
Is there a function in R that corresponds to the
function ``map'' of perl?
It could be called like:
vector.a <- map( vector.b, FUN, args.for.FUN )
It should execute for each element ele.b of vector.b:
FUN( vector.b, args.for.FUN)
It should return a vector (or data.frame) of the results
of the calls of FUN.
It nearly works using:
apply( data.frame( vector.b ), 1, FUN,
2004 Dec 01
1
split() and paste() a vector to get a multi line string
How can I get a multi line string from a vector of string tokens
in an easy manner (e.g. for the use as xlab of a plot)?
I have e.g.:
> tokens <- letters[1:5]
[1] "a" "b" "c" "d" "e"
I search:
[1] "a, b, c\nd, e"
I tried:
> nlines <- 2
> ntokens.line <- ceiling(length(tokens) / nlines)
> token.list <-
2007 Feb 15
2
Problems with 'delay'/'delayedAssign' when installing data package
I downloaded:
http://www.bioconductor.org/data/metaData/hgu95av2_1.7.0.tar.gz
described as:
Package: hgu95av2
Title: A data package containing annotation data for hgu95av2
Version: 1.7.0
Created: Wed Jan 12 16:57:23 2005
Author: Lin,Chenwei
Description: Annotation data file for hgu95av2 assembled using data
from public data repositories
Maintainer:
2007 Jun 28
3
: regular expressions: escaping a dot
What's really the problem with:
> regexpr( '\.odt$', "xxxxYodt", perl=TRUE )
Warning: '\.' is an unrecognized escape in a character string
Warning: unrecognized escape removed from "\.odt$"
[1] 5
attr(,"match.length")
[1] 4
I know that I could use:
> regexpr( '[.]odt$', "xxxxYodt", perl=TRUE )
But it seems to me that
2008 Apr 02
1
Trouble combining plotmath, bquote, expressions
I'm using R-2.6.2 on Fedora Linux 9.
I've been experimenting with plotmath.
I wish it were easier to combine expressions in plotmath with values
from the R program itself. There are two parameters in the following
example, the mean "mymean" and standard deviation "mystd". I am able
to use bquote to write elements into the graph title like
mu = mymean
and R will
2002 May 21
1
plotting functions with line width (lwd) as vectors
If I want to plot different widths of line segments or arrows
I have to program loops to plot each line apartly. Is that
right?
n <- 6
x <- 1:n
y <- rnorm(1:n)
q <- ( x %% 3 + 1 ) * 2
plot( x, y, cex=q )
for( i in 1:(n-1) ) lines( x[i:(i+1)], y[i:(i+1)], lwd=q[i], col=q[i] )
Would it not be possible to make plotting functions accept
vectors of line widths (as they
2004 Oct 22
1
ave gives unexpected NA's
[R 2.0.0 on Linux]
I tried:
> df <- data.frame(
grp1=factor( c('A' ,'A' ,'A' ,'D', 'D' ) ) ,
grp2=factor( c('a1','a2','a2','d1','d1') )
)
> df
grp1 grp2 val
1 A a1 1
2 A a2 2
3 A a2 4
4 D d1 8
5 D d1 16
I got:
> with( df, ave( val, grp1, grp2, FUN=sum ) )
2002 Nov 11
2
repeating a dataframe n times in the direction of the rows
Question:
How can a repeat a dataframe n times
in the direction of the rows?
(Or: How I can rbind a dataframe n times ?)
Example Data:
x <- data.frame( alpha=letters[1:3], num=1:3 )
n <- 4
Complicated solution: To rbind a dataframe n times I can program a loop:
xr <- x
for( i in 2:n ) xr <- rbind( xr, n )
Observation: To cbind a dataframe n times I
2008 Feb 14
1
{lattice/grid} "Error using packet 1" and traceback
On some errors during the plot of a lattice/grid graphics, there is written
a message like "Error using packet 1: missing value where TRUE/FALSE needed"
into the concering panel and the next panel is plotted.
Which option I could use to stop the execution to have a look
at the error by a traceback?
Regards - Wolfram
2000 Sep 12
1
Variable value in expression (plotmath)
Hello,
I have a problem with the plotmath facility and haven't found any solution
in the FAQ and Online-Help.
I am trying to incorporate the value of a variable in an expression for an
axis with plotmath.
Considering having
> gamma <- 10
I'd like to have a plot with
> plot( .... , xlab=expression(gamma==10))
but depending on the true value of the variable.
How can I
2004 Jul 08
2
Getting elements of a matrix by a vector of column indice s
See if the following helps:
> m <- outer(letters[1:5], 1:4, paste, sep="")
> m
[,1] [,2] [,3] [,4]
[1,] "a1" "a2" "a3" "a4"
[2,] "b1" "b2" "b3" "b4"
[3,] "c1" "c2" "c3" "c4"
[4,] "d1" "d2" "d3" "d4"
[5,]
2003 Dec 22
1
[R] lattice: levelplot: error: min not meaningful for factor (PR#6005)
R 1.8.1:
___COMMAND____________________________________________
levelplot( yield ~ year * variety | site, barley )
___ERROR_MESSAGE______________________________________
Error in Summary.factor(..., na.rm = na.rm) :
"min" not meaningful for factors
___COMMENT____________________________________________
levelplot( yield ~ as.numeric(year) * as.numeric(variety) | site,