Hexadecimal literals in GNU R
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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.Want to share your content on R-bloggers? click here if you have a blog, or here if you don't.
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.
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