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Safe String to BigDecimal conversion
...ead some BigDecimal values from the string. Let's say I have this String: "1,000,000,000.999999999999999" and I want to get a BigDecimal out of it. What is the way to do it?
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What does .SD stand for in data.table in R
...his is your data.table:
DT = data.table(x=rep(c("a","b","c"),each=2), y=c(1,3), v=1:6)
setkey(DT, y)
DT
# x y v
# 1: a 1 1
# 2: b 1 3
# 3: c 1 5
# 4: a 3 2
# 5: b 3 4
# 6: c 3 6
Doing this may help you see what .SD is:
DT[ , .SD[ , paste(x, v, sep="", collapse="_")], by=y]
# y V1
# 1...
git diff between cloned and original remote repository
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161
1) Add any remote repositories you want to compare:
git remote add foobar git://github.com/us...
What's the difference between `1L` and `1`?
I often seen the symbol 1L (or 2L , 3L , etc) appear in R code. Whats the difference between 1L and 1 ? 1==1L evaluates to TRUE . Why is 1L used in R code?
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Increment a database field by 1
...I have a field, of say logins, how would I go about updating that field by 1 within a sql command?
5 Answers
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How to determine if a number is a prime with regex?
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119
You said you understand this part, but just to emphasize, the String generated has a length eq...
setup cron tab to specific time of during weekdays
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177
Same as you did for hours:
*/2 09-18 * * 1-5 /path_to_script
0 and 7 stand for Sunday
6 sta...
How can I add additional PHP versions to MAMP
The current version of MAMP that I have only has php 5.2.17 and 5.4.4. I need 5.3.X. Is there a way to add additional versions that can be selected in the MAMP interfaces php preferences? This is for the free version of MAMP, not MAMP PRO.
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How to compare times in Python?
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132
You can't compare a specific point in time (such as "right now") against an unfixed, recurring...
Read input from console in Ruby?
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edited Jun 2 '15 at 16:16
Marius Butuc
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