[R] How do I "teach" R that columns 1, 2, and 3 are the Year-Month-Day

[Ebert,Timothy Aaron]

You don't, or not exactly. You could make the three columns strings, then add them together. I would then use the lubridate package to convert to a date.  The first four lines of code are just getting a bit of data into R. The lubridate package will also work with date-time objects if you have time. 

year<-rep("2021",4) 
month<-c(7,8,9,11)
day<-c(25,27,26,4)
fuel<-c(50.45, 61.48,59.07,55.40)
df<-data.frame(year,month,day,fuel)
df$day <-as.character(df$day)
df$month<-as.character(df$month)
df$date <- paste(year,"/",month,"/",day)
library(lubridate)
df$date<-ymd(df$date)

Regards,
Tim

-----Original Message-----
From: R-help <r-help-bounces using r-project.org> On Behalf Of Avi Gross via R-help
Sent: Tuesday, June 14, 2022 10:00 PM
To: r-help using r-project.org
Cc: r-help using r-project.org
Subject: Re: [R] How do I "teach" R that columns 1, 2, and 3 are the Year-Month-Day

[External Email]

Greg,
It looks like you mean to have a data.frame containing the year as a column then Month, Day and something called Fuel.
You only made a vector called Fuel, with no name as part of it and plotted it.
So you did not expect any names, I assume.
You probably want to combine the first three columns into holding some kind of date object with something like as.Date("2021-07-25") for each row and make a vector of those. Your data.frame might then contain two columns called Date and Fuel and you might use whatever plotting method to put Fuel on the Y axis and dates on the X axis or whatever makes sense. Plotting four independent columns will not work here.
And note the NAMES go in with something like:
mydata <- data.frame(Date=dates, Fuel=Fuel) I have not done all the work but hopefully this is helpful.

-----Original Message-----
From: Gregory Coats via R-help <r-help using r-project.org>
To: Greg Comcast Coats <gregcoats using me.com>
Cc: Marc Schwartz via R-help <r-help using r-project.org>
Sent: Tue, Jun 14, 2022 9:08 pm
Subject: [R] How do I "teach" R that columns 1, 2, and 3 are the Year-Month-Day

# Column 1 is the Year
# Column 2 is the Month
# Column 3 is the Day
# Column 4 is the Fuel
Fuel <- c(50.45, 61.48, 59.07, 55.40, 30.63, 41.35, 32.81, 49.86, 62.99, 89.37) plot (Fuel)

2021  7 25  50.45
2021  8 27  61.48
2021  9 26  59.07
2021 11  4  55.40
2021 11 22  30.63
2021 11 26  41.35
2021 12  6  32.81
2022  1 14  49.86
2022  4 29  62.99
2022  6 11  89.37

How do I "teach" R that columns 1, 2, and 3 are the Year-Month-Day?
Greg Coats
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PLEASE do read the posting guide https://urldefense.proofpoint.com/v2/url?u=http-3A__www.R-2Dproject.org_posting-2Dguide.html&d=DwIFaQ&c=sJ6xIWYx-zLMB3EPkvcnVg&r=9PEhQh2kVeAsRzsn7AkP-g&m=5mwGPy3wD6UgdaNamboKRB8Oo4Yd9OIBPIhrRkniM0N0wUSsekHwK4HbHytbdscH&s=BG0mynWESmDXi-6Z2LX7yRr51Gqw3B-Gzfg3Ye2cy8M&e=
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