Forcing R output to be scientific notation with at most two decimals
I think it would probably be best to use formatC
rather than change global settings.
For your case, it could be:
numb <- c(0.05, 0.05671, 0.000000027)
formatC(numb, format = "e", digits = 2)
Which yields:
[1] "5.00e-02" "5.67e-02" "2.70e-08"
How to prevent scientific notation in R?
To set the use of scientific notation in your entire R session, you can use the scipen
option. From the documentation (?options
):
‘scipen’: integer. A penalty to be applied when deciding to print
numeric values in fixed or exponential notation. Positive
values bias towards fixed and negative towards scientific
notation: fixed notation will be preferred unless it is more
than ‘scipen’ digits wider.
So in essence this value determines how likely it is that scientific notation will be triggered. So to prevent scientific notation, simply use a large positive value like 999
:
options(scipen=999)
Scientific notation issue in R
To circumvent the problem due to number storing/representation, you can import your ID
variable directly as character with the option colClasses
, for example, if using read.csv
and importing a data.frame with the ÌD
column and another numeric column:
mydata<-read.csv("file.csv",colClasses=c("character","numeric"),...)
Force R not to use exponential notation (e.g. e+10)?
This is a bit of a grey area. You need to recall that R will always invoke a print method, and these print methods listen to some options. Including 'scipen' -- a penalty for scientific display. From help(options)
:
‘scipen’: integer. A penalty to be applied when deciding to print
numeric values in fixed or exponential notation. Positive
values bias towards fixed and negative towards scientific
notation: fixed notation will be preferred unless it is more
than ‘scipen’ digits wider.
Example:
R> ran2 <- c(1.810032e+09, 4)
R> options("scipen"=-100, "digits"=4)
R> ran2
[1] 1.81e+09 4.00e+00
R> options("scipen"=100, "digits"=4)
R> ran2
[1] 1810032000 4
That said, I still find it fudgeworthy. The most direct way is to use sprintf()
with explicit width e.g. sprintf("%.5f", ran2)
.
Using format() in R to convert numeric value to scientific notation after rounding
I think rounded_vals
might have been stored as character values. Try converting them to numbers using as.numeric()
and then put it into the format()
function.
Remove Scientific Notation from R plot
The issue is with cut
. Use the dig.lab
to adjust the digits
CatLotData2$LotCat <-cut(CatLotData2$'LOT SIZE',
c(0,1000,2000,3000,4000,5000,6000,7000,8000,9000,10000,12500,
15000,17500,Inf), dig.lab = 10)
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