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R: Non-Numeric Argument to Binary Operator

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R: Non-Numeric Argument to Binary Operator

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When debugging R code, given my Java background, I often find myself trying to print out the state of variables along with an appropriate piece of text like this:

names = c(1,2,3,4,5,6)
> print("names: " + names)
Error in "names: " + names : non-numeric argument to binary operator

We might try this next:

> print("names: ", names)
[1] "names: "

which doesn’t actually print the names variable – only the first argument to the print function is printed.

We’ll find more success with the paste function:

> print(paste("names: ", names))
[1] "names:  1" "names:  2" "names:  3" "names:  4" "names:  5" "names:  6"

This is an improvement but it repeats the ‘names:’ prefix multiple times which isn’t what we want. Introducing the toString function gets us over the line:

> print(paste("names: ", toString(names)))
[1] "names:  1, 2, 3, 4, 5, 6"

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Topics:
bigdata ,big data ,r language ,binary operator ,computer science

Published at DZone with permission of Mark Needham, DZone MVB. See the original article here.

Opinions expressed by DZone contributors are their own.

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