Displaying 20 results from an estimated 1000 matches similar to: "Time arithmetic"
2010 Feb 23
1
Problem with strptime generating missing values where none appear to exist
Dear R Helpers,
I am having difficulty with strptime. I wish to find the differences between
two vectors of times. I have apparently no difficulty to convert the vectors
to the appropriate format using strptime. But, then difftime does not
calculate all the differences.
Here is the code and output:-
dob=strptime(as.character(datx$BDT),'%d-%b-%y'); dob$year=dob$year-100
2017 Sep 11
2
Σχετ: show 0 at y axis in xyplot lattice
Dear Bert and all,
I am really sorry. This is the full code:
dat<-read.csv("example.csv")attach(dat)
sdate<-as.Date(Date, format="%Y-%m-%d")
#change the colour of the strip background
my.settings <- canonical.theme(color=FALSE)
my.settings[['strip.background']]$col <- "blue"
dat_key <- list(space="right",
??????????????? lines =
2008 Apr 23
1
difftime result in years?
I would like to know how many years (including partial years) are between
two dates.
So difftime("20/11/1962", "20/5/1964", units="years") would be about 1.5
But units of years are not available.
cheers
Worik
[[alternative HTML version deleted]]
2017 Sep 11
0
show 0 at y axis in xyplot lattice
Not reproducible, as we have neither "example.csv" nor "Date" .
Cheers,
Bert
Bert Gunter
"The trouble with having an open mind is that people keep coming along and
sticking things into it."
-- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )
On Mon, Sep 11, 2017 at 2:38 PM, Maria Lathouri <mlathouri at yahoo.gr> wrote:
> Dear
2017 Sep 11
0
show 0 at y axis in xyplot lattice
1. Not reproducible since my.settings, dat_key, sdate not provided.
2. Why did you not try something like ylim = c(-5,80) ?
Cheers,
Bert
Bert Gunter
"The trouble with having an open mind is that people keep coming along and
sticking things into it."
-- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )
On Mon, Sep 11, 2017 at 12:33 PM, Maria Lathouri via
2017 Sep 11
4
show 0 at y axis in xyplot lattice
Dear all
I am trying to make a plot in xyplot lattice by groups. I would like to show "0" in y axis but I don't want to be aligned with the x axis. I want to be a little bit above.
I have tried many options but I don't get what I want. I also tried ylim=c(0, 80) but both 0 and 80 are fully aligned with the x-axis and the upper boundary of the plot, respectively:
xyplot(upper.zn +
2017 Sep 12
0
show 0 at y axis in xyplot lattice
Hi Maria
Rule 1 make sure your data is in the right format
dat <- source("G:/1/savedat.txt")
> dat
$value
Location Date Zn2 upper.zn lower.zn
1 upstream 2016-04-27 29.92477 55.59800 13.912207
2 spill 2016-04-27 12.84040 22.07006 6.964934
3 downstream 2016-04-27 22.49673 41.60901 11.739109
4 upstream 2016-06-28 23.98425 45.60219 10.690640
5
2017 Sep 12
2
Σχετ: show 0 at y axis in xyplot lattice
Dear all,
Thank you very much for the help. ylim=c(-5, 80) worked.?
Regarding the reproducible example, I used dput () and saved the file as txt. It is not the first time that I used this way and normally it works. Because when I try to attach a .csv file with the data, most of the time it doesn't go through.?
I will know for the next time.?
Many thanks.
Regards,Maria
???? 2:11 ?.?.
2017 Sep 12
0
Σχετ: show 0 at y axis in xyplot lattice
Dear Maria
The file you attached to your first e-mail did come through but I think
some people on the list must have missed it.
Michael
On 12/09/2017 12:54, Maria Lathouri via R-help wrote:
> Dear all,
> Thank you very much for the help. ylim=c(-5, 80) worked.
> Regarding the reproducible example, I used dput () and saved the file as txt. It is not the first time that I used this way
2010 Jun 16
5
t-test problem
I have two pairs of related vectors
x1,y1
and
x2,y2
I wish to do a test for differences in means of x1 and y1, ditto x2 and y2.
I am getting odd results. I am not sure I am using 'pt' properly...
I have not included the raw vectors as they are long. I am interested if I
am using R properly...
> c(length(x1), length(y1), length(x2), length(y2))
[1] 3436 1619 2677 2378
First
2009 Jun 08
4
increase number of ticks on x axis of dates
My x axis is a series of daily dates (e.g., 01/01/2000, 01/02/2000,
etc.) from 2000 to end of 2008. The default only gives me 4 ticks. I
want more. Why doesn't this work?
sdate<-as.POSIXct(strptime(date,format="%m/%d/%Y"))
plot(ppt~sdate,type="l",ylim=c(0,47),col=1,lwd=1,pch=16,ylab="Salinity,
psu",xlab="Year",las=1,main="Duck Key
2011 Nov 11
3
Why does length("") == 1?
It seems obvious to me that the empty string "" is length 0.
cheers
Worik
[[alternative HTML version deleted]]
2009 Sep 24
2
Date formats in as.Date
I have trouble with this:
as.Date("Sep-1981", format="%b-%Y")
Returns "NA"
>From documentation for strftime
'%b' Abbreviated month name in the current locale. (Also matches
full name on input.)
'%Y' Year with century.
What am I doing wrong?
cheers
Worik
[[alternative HTML version deleted]]
2008 Dec 31
2
sdate<-as.POSIXct(strptime(date,format="%m/%d/%Y %H:%M"))
Newbie here~
I've spent a ton of time on this, but have to admit I am stuck. I've tried various combinations of strptime and the package CHRON, but still can't get there.
My simple task is that I want to plot salinity (S1 or S2) on y-axis and time on x-axis, but I want to use a lay-understandable representation of time (not Julian). If I use the following command, I can make a
2012 Oct 09
4
Modern Symbolic debugger for R programmes?
I think I am whistling in the wind, but is there a modern symbolic
debugger for R programmes?
I am working through some one else's code, thousands of lines, that
has the occasional bug in it, and a lot in my understanding of it.
I cannot make setBreakpoint or findLineNum work. I get "No source
refs found.". I am starting to loose my mind!
A debugger where I could set
2012 Apr 19
2
Trouble with [sv]apply
Friends
I clearly donot understand how sapply and vapply work.
What I have is a function that returns a matrix with an indeterminate
number of rows (some times zero) but a constant number of columns. I
cannot reliably use an apply function to assemble the matrices into a
matrix. I am not sure it is possible.
I can demonstrate the core of my confusion with this simple code.
A.f <-
2010 Feb 23
0
subtracting 100 from strptime year vector generates missing values in POSIXct where none appear to exist in strptime year vector
Thanks Don MacQueen for this reply to my initial query - please SEE MY REPLIES TO THESE IDEAS AND FURTHER INFORMATION BELOW
>From: Don MacQueen [macq at llnl.gov]
>Sent: 23 February 2010 21:25
>To: Jonathan Williams; r-help at r-project.org
>
>Subject: Re: [R] Problem with strptime generating missing values where none appear to exist
>
>What happens if you do all that NA
2010 Jun 13
2
Scope and sapply
I am puzzled by the scope rules that apply with sapply.
If I want to modify a vector with sapply I tried...
N <- 10
vec <- vector(mode="numeric", length=N)
test <- function(i){
vec[i] <- i
}
sapply(1:N, test)
vec
but it not work.
How can this be done?
Worik
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2012 Nov 30
3
Line numbers with errors and warnings?
Is it possible to get a line number with an error report?
I have a long script and an error:
Error in `[.xts`(x, xsubset) : subscript out of bounds
It would be very helpful, and save a lot of time, if there was some
indication in the error message which line the error was.
I can find it using binary search but that is a painful process.
cheers
Worik
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2011 May 08
2
Pretty printing numbers
Friends
I am trying to format a number to a string so 2189.745 goes to "2,189.35"
and 309283.929 goes to "309,283.93"
I have tried to use formatC(X, big.mark=",",drop0trailing=FALSE, format="f")
but it does not get the number of decimals correct. Specifying digits does
not work as that is significant digits. I could use a switch statement
switching on