CODEWITHSUNDEEP
rformatprintf
TNT
TNT

Reputation: 2511

R sprintf maximum two decimals but no leading zeros

As per the title, I need a string format where 

sprintf(xxx,5)        prints "5"
sprintf(xxx,5.1)        prints "5.1"
sprintf(xxx,15.1234)  prints "15.12"

That is: no leading zeros, no trailing zeros, maximum of 2 decimals.

Is it possible? if not with sprintf, some other way?

The use case is to report degrees of freedom which are generally whole numbers, but when corrected, may result in decimals - for which case only I want to add two decimals).

Upvotes: 1

Views: 1507

Answers (2)

Roland
Roland

Reputation: 132706

Maybe formatC is easier for this:

formatC(c(5, 5.1, 5.1234), digits = 2, format = "f", drop0trailing = TRUE)
#[1] "5"    "5.1"  "5.12"

Upvotes: 2

Phann
Phann

Reputation: 1327

A solution based on sprintf as suggested:

sprintf("%.4g", 5)
#[1] "5"
sprintf("%.4g", 5.1)
#[1] "5.1"
sprintf("%.4g", 15.1234)
#[1] "15.12"

Verbose information to sprintf can be found e.g. here: http://www.cplusplus.com/reference/cstdio/printf/ which says:

g | Use the shortest representation: %e or %f

and

.number | ... For g and G specifiers: This is the maximum number of significant digits to be printed.

Upvotes: 0

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