(This article was first published on

Recently I have used hexadecimal numbers in GNU R. The way they are parsed surprised me and is inconsistent with Java. As R Language Definition pdf only briefly mentions hexadecimal numbers here is what I have found.**R snippets**, and kindly contributed to R-bloggers)First I have checked the following code:

0x11

# 17

0x1.1

# 17I seemed that GNU R drops the decimal point. So I have checked notation with exponent being power of 2 (as in Java):

0x1.1p0

# 1.0625

0x1.1p4

# 17Now decimal point is correctly taken into account so I have checked further.

In the notation without exponent part GNU R just discards decimal points as in this example:

0x111

# 273

0x1.1.1

# 273

0x....1....1....1

# 273However, in notation with exponent last decimal point is taken into consideration and all earlier decimal points are ignored:

0x11.1p0

# 17.0625

0x1.1.1p0

# 17.0625

0x....1....1....1p0

# 17.0625In summary - handling of hexadecimal literals in GNU R is nonstandard and at least for me - unexpected.

To

**leave a comment**for the author, please follow the link and comment on his blog:**R snippets**.R-bloggers.com offers

**daily e-mail updates**about R news and tutorials on topics such as: visualization (ggplot2, Boxplots, maps, animation), programming (RStudio, Sweave, LaTeX, SQL, Eclipse, git, hadoop, Web Scraping) statistics (regression, PCA, time series, trading) and more...