CODEWITHSUNDEEP
rloops
Olivia Samson
Olivia Samson

Reputation: 21

Loop over month names in R

I'm learning the 'for loop' command in R and I wanted to create a code that told you your zodiac sign.

m <- c("January", "February", "March", "April","May","June","July","August","September","October","November","December")
  

for(m in "January":"December") {
  
  if (m == "March"|"April" )
    next
}

print(paste("You are an Aries"))

When I run this I receive the errors 'Error in "January":"December" : NA/NaN argument' and '2: In "January":"December" : NAs introduced by coercion'. How do I remove those?

Upvotes: 0

Views: 534

Answers (2)

user13653858
user13653858

Reputation:

There is a built-in vector with month names: month.name.

To make a for loop just type:

for(i in month.name) {...}

To check whether the month is March or April, use %in%, e.g.:

if (i %in% c("March", "April") {...}

So your code could be:

for(i in month.name) {
  if (i %in% c("March", "April")) {
    print(paste(i, "- you are an Aries."))
  } else {
    print(paste(i, "- you are not in Aries."))
  }
}
#> [1] "January - you are not in Aries."
#> [1] "February - you are not in Aries."
#> [1] "March - you are an Aries."
#> [1] "April - you are an Aries."
#> [1] "May - you are not in Aries."
#> [1] "June - you are not in Aries."
#> [1] "July - you are not in Aries."
#> [1] "August - you are not in Aries."
#> [1] "September - you are not in Aries."
#> [1] "October - you are not in Aries."
#> [1] "November - you are not in Aries."
#> [1] "December - you are not in Aries."

Created on 2020-07-09 by the reprex package (v0.3.0)

Upvotes: 1

G. Grothendieck
G. Grothendieck

Reputation: 269431

Any of these three snippets will print the names of each month except for March and April. month.name is a vector that is built into R containing the names of the months.

for(m in month.name) {
  if (m %in% c("March", "April")) next
  print(m)
}

for(m in setdiff(month.name, c("March", "April"))) print(m)

print(setdiff(month.name, c("March", "April")))

Upvotes: 2

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