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I am returning to some old code where I had used the following syntax:
y[df$myvar %between% c(1,100)]
but get the error
could not find function "%between%"
This code used to work, and I have updated R in the mean time. any thoughts?
As Pascal pointed out, you should load the package data.table first:
library(data.table)
Then you'll be able to use it.
Related
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I'm lost : i'd like to convert chararcter to date using as.Date() in R. I genuinely don't know what i missed with such a simple code. Here is an example
week_dates <- as.Date("06/20/2022", format ="%d/%m/%Y")
week_dates return only NA. Any idea what i missed ?
Thanks in advance !
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Closed 2 years ago.
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install.packages(qwraps2)
Error in install.packages : object 'qwraps2' not found
This package wont install, I get the above error. Can anyone help?
Try install.packages("qwraps2") instead.
it will not work without the quotes around package name
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Can anyone point me in the right direction for getting around this error? I'm new to creating packages and am currently following Hadley Wickham's guide.
http://r-pkgs.had.co.nz/description.html
To copy the comments of #zx8754, use_package is now part of the usethis package. And per the comment from #MichaelChirico, Hadley's book is updated on github, but has not yet been re-published.
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Closed 4 years ago.
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I am doing an exercise to create a function. One of the questions is:
"We can estimate the cumulative risk of an certain event using the
exponential formula
1-exp(-1/10000*t) where t is the time to the event. Create a function ans(t), which returns the risk at time t.
and I am using this command:
function(t){ans(t)<-1-exp(-1/10000*t)return(ans(t))}
but it is giving wrong answer. Can someone help me to understand this please?
The proper format to define a function is this:
ans<-function(t){
answer<-1-exp(-1/10000*t)
return(answer)
}
ans(1)
#[1] 9.9995e-05
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Im taking an R programming class that is using the package "matplot" for a demo. I cant find "matplot" in CRAN so i'm assuming it has been replaced/deleted/changed. Is there another package that replaced it?
There is a matplot function within the graphics library. Here's an example from the documentation:
require(grDevices)
matplot((-4:5)^2, main = "Quadratic")
Also, matplot is a plotting library for PHP. Perhaps your instructor could help clarify what is expected.