Convert hex to decimal in R

问题:

I found out that there is function called .hex.to.dec in the fBasics package.

When I do .hex.to.dec(a), it works.

I have a data frame with a column samp_column consisting of such values:

a373, 115c6, a373, 115c6, 176b3 

When I do .hex.to.dec(samp_column), I get this error:

"Error in nchar(b) : 'nchar()' requires a character vector"

When I do .hex.to.dec(as.character(samp_column)), I get this error:

"Error in rep(base.out, 1 + ceiling(log(max(number), base = base.out))) : invalid 'times' argument"

What would be the best way of doing this?

回答1:

Use base::strtoi to convert hexadecimal character vectors to integer:

strtoi(c("0xff", "077", "123")) #[1] 255  63 123 

回答2:

There is a simple and generic way to convert hex <-> other formats using "C/C++ way":

V <- c(0xa373, 0x115c6, 0xa373, 0x115c6, 0x176b3)  sprintf("%d", V) #[1] "41843" "71110" "41843" "71110" "95923"  sprintf("%.2f", V) #[1] "41843.00" "71110.00" "41843.00" "71110.00" "95923.00"  sprintf("%x", V) #[1] "a373"  "115c6" "a373"  "115c6" "176b3" 

回答3:

strtoi() has a limitation of 31 bits. Hex numbers with the high order bit set return NA:

> strtoi('0x7f8cff8b') [1] 2139946891 > strtoi('0x8f8cff8b') [1] NA 

文章来源: Convert hex to decimal in R