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How do I convert from int to Long in Java?
...ence between a cast to long and a cast to Long. If you cast to long (a primitive value) then it should be automatically boxed to a Long (the reference type that wraps it).
You could alternatively use new to create an instance of Long, initializing it with the int value.
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What does an underscore in front of an import statement mean?
I saw this example from sqlite3 on GitHub :
4 Answers
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How can I stop redis-server?
... when I try to start a new server by entering redis-server , I'm greeted with the following:
25 Answers
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Keep only date part when using pandas.to_datetime
...me to parse the dates in my data. Pandas by default represents the dates with datetime64[ns] even though the dates are all daily only.
I wonder whether there is an elegant/clever way to convert the dates to datetime.date or datetime64[D] so that, when I write the data to CSV, the dates are no...
How to append rows to an R data frame
... those vectors, and then, at the end, create your data.frame.
Continuing with Julian's f3 (a preallocated data.frame) as the fastest option so far, defined as:
# pre-allocate space
f3 <- function(n){
df <- data.frame(x = numeric(n), y = character(n), stringsAsFactors = FALSE)
for(i in 1:...
Why does this code segfault on 64-bit architecture but work fine on 32-bit?
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The cast to int* masks the fact that without the proper #include the return type of malloc is assumed to be int. IA-64 happens to have sizeof(int) < sizeof(int*) which makes this problem obvious.
(Note also that because of the undefined behaviour it could st...
Enforcing the type of the indexed members of a Typescript object?
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edited Oct 24 '19 at 15:39
ZephDavies
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How do I get the opposite (negation) of a Boolean in Python?
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edited Aug 11 '11 at 18:56
Mike Graham
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Efficiency of purely functional programming
...trict evaluation semantics, not lazy) to one that can mutate data, an algorithm written for the impure Lisp that runs in O(n) can be translated to an algorithm in the pure Lisp that runs in O(n log n) time (based on work by Ben-Amram and Galil [1992] about simulating random access memory using only ...
How to retrieve checkboxes values in jQuery
How to use jQuery to get the checked checkboxes values, and put it into a textarea immediately?
15 Answers
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