CODEWITHSUNDEEP
arraysrvector
1010111100011
1010111100011

Reputation: 93

Creating Vector with Condition

How can I create this kind of array in R?

iii <- seq(from = 1, to = 49, by = 2)

this only creates values:

1  3  5 .. 49

The array that I need to create:

1, 0, 3, 0, 5, 0, 7, . . . , 0, 49

Upvotes: 1

Views: 32

Answers (1)

Jaap
Jaap

Reputation: 83215

Using:

x <- 1:11
x * (x %% 2)

gives:

[1]  1  0  3  0  5  0  7  0  9  0 11

What this does:

  • x %% 2 creates a vector of one's for the uneven values of x and zero's for the even values of x.
  • Multiplying x with x %% 2 thus gives a vector with uneven values with zero's in between.

Based the suggestion of @lmo, you could also do:

x <- seq(1, 11, 2)
head(rep(x, each = 2) * (1:0), -1)

which will give the same result.

Upvotes: 1

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