CODEWITHSUNDEEP
r
Beth Bennett
Beth Bennett

Reputation: 21

Need help creating the following sequence:

In R, I need to create a vector b = (1, 1+pi, 1+2pi, 1+3pi,...,1+19pi). I am unsure how to do this. I keep trying to use the seq command (i.e. seq(1, 1+npi n = 1:19) and that's totally wrong!), but don't know the proper syntax to make it work, thus it never does.

Any help would be appreciated.

Upvotes: 1

Views: 41

Answers (2)

Julius Vainora
Julius Vainora

Reputation: 48251

You should use simply 0:19 * pi + 1. Using seq is not so nice: seq(1, 1 + 19 * pi, by = pi) or seq(1, 1 + 19 * pi, length = 20).

Upvotes: 1

IRTFM
IRTFM

Reputation: 263481

R needs the multiplication operator.

b <- 1+ seq(0,19)*pi

Or slightly faster in situations where speed might matter:

 b <- 1+ seq.int(0,19)*pi

You could use the equivalent:

b <- 1+ 0:19*pi

Because the ":" operator has very high precedence ( see ?Syntax), it's reasonable safe. Just be careful that you understand precedence when you use a minus or plus sign where it might be parse as a binary operator (remembering that spaces are ignored and that unary-minus has higher precedence than the single-colon, but binary minus or plus has a lower precedence :

> 1: 5+5
[1]  6  7  8  9 10

Upvotes: 2

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