Multiplying Vectors in R

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Multiplying Vectors in R

Steve Jones - SSC Editor

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Points: 736172
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May 19, 2021 at 12:00 am

#3876012

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darrenjacquet SSCommitted Points: 1646 More actions · Answer 1

I believe that the line j <- (4,5) is missing a 'c'. As written the answer should be Error: unexpected ',' in "j <- (4,". Good question though. Thank you Steve.

Steve Jones - SSC Editor SSC Guru Points: 736172 More actions · Answer 2

Steve Jones - SSC Editor

SSC Guru

Points: 736172

May 19, 2021 at 2:12 pm

#3885330

Thanks, good catch. You are correct.

this is fixed.

gcleggs SSC Rookie Points: 47 More actions · Answer 3

In addition to the missing 'c' on second vector, error will be thrown on matrix multiplication due to second vector being 1 element shorter than the first. Add 1 to end of second vector. Result 4 10 3.

Steve Jones - SSC Editor SSC Guru Points: 736172 More actions · Answer 4

Not an error. A warning. This still works:

> i <- c(1,2,3)
> j <- c(4,5)
> k <- i * j
Warning message:
In i * j : longer object length is not a multiple of shorter object length
> k
[1]  4 10 12

gcleggs SSC Rookie Points: 47 More actions · Answer 5

i <- c(1,2,3)

> j <- c(4,5)

> k <- i * j

Warning message:

In i * j : longer object length is not a multiple of shorter object length

> k

[1] 4 10 12

>

I stand corrected, my apologies.

Saw the warning: (my brain registered Error), and did not display the k value.