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.

First I have checked the following code:

0x11

# 17

0x1.1

# 17

I 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

# 17

Now 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

# 273

However, 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

# 17.0625

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

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