大约有 13,906 项符合查询结果（耗时：0.0259秒） [XML]
How to programmatically close a JFrame
...rrect way to get a JFrame to close, the same as if the user had hit the X close button, or pressed Alt + F4 (on Windows)?
...
Drop unused factor levels in a subsetted data frame
...r . When I create a subset of this dataframe using subset or another indexing function, a new data frame is created. However, the factor variable retains all of its original levels, even when/if they do not exist in the new dataframe.
...
input() error - NameError: name '…' is not defined
...
input function in Python 2.7, evaluates whatever your enter, as a Python expression. If you simply want to read strings, then use raw_input function in Python 2.7, which will not evaluate the read strings.
If you are using Python 3.x, raw_input has been renamed to input. Quoting the Python 3.0 rel...
How to overload __init__ method based on argument type?
...')]
The reason it's neater is that there is no doubt about what type is expected, and you aren't forced to guess at what the caller intended for you to do with the datatype it gave you. The problem with isinstance(x, basestring) is that there is no way for the caller to tell you, for instance, tha...
Distinct by property of class with LINQ [duplicate]
...
I think that no Overhead exists!
– Amirhossein Mehrvarzi
Dec 23 '13 at 13:47
6
...
How to make the hardware beep sound in Mac OS X 10.6
I just want that Mac OS X 10.6 does a hardware beep sound like in open suse and other distributions. I tried following approaches
...
Remove xticks in a matplotlib plot?
I have a semilogx plot and I would like to remove the xticks. I tried:
9 Answers
9
...
Why are functions in Ocaml/F# not recursive by default?
...ous definition inside the body of a new definition. F# inherited this syntax from OCaml.
For example, superceding the function p when computing the Shannon entropy of a sequence in OCaml:
let shannon fold p =
let p x = p x *. log(p x) /. log 2.0 in
let p t x = t +. p x in
-. fold p 0.0
Not...
What's the point of having pointers in Go?
...
I really like example taken from http://www.golang-book.com/8
func zero(x int) {
x = 0
}
func main() {
x := 5
zero(x)
fmt.Println(x) // x is still 5
}
as contrasted with
func zero(xPtr *int) {
*xPtr = 0
}
func main()...
Trimming a huge (3.5 GB) csv file to read into R
...ears.
file_in <- file("in.csv","r")
file_out <- file("out.csv","a")
x <- readLines(file_in, n=1)
writeLines(x, file_out) # copy headers
B <- 300000 # depends how large is one pack
while(length(x)) {
ind <- grep("^[^;]*;[^;]*; 20(09|10)", x)
if (length(ind)) writeLines(x[ind]...