大约有 37,908 项符合查询结果（耗时：0.0316秒） [XML]
Replace comma with newline in sed on MacOS?
...
Upvoted. For more info see the "QUOTING" section of man bash.
– tboyce12
Apr 1 '15 at 18:23
...
Grouping functions (tapply, by, aggregate) and the *apply family
...b c
1 3 91
sapply(x, FUN = sum)
a b c
1 6 5005
In more advanced uses of sapply it will attempt to coerce the
result to a multi-dimensional array, if appropriate. For example, if our function returns vectors of the same length, sapply will use them as columns of a matrix:
sa...
What's the most efficient way to erase duplicates and sort a vector?
...
I think your results are wrong. In my tests the more duplicated elements the faster vector (comparative) is, actually scales the other way around. Did you compile with optimizations on and runtime checks off?. On my side vector is always faster, up to 100x depending on the...
How to “comment-out” (add comment) in a batch/cmd?
...ten in Bourne shell, not Windows batch, so how is it relevant here? Furthermore, the colon command being valid Bourne syntax is not a "bonus side effect"; it's precisely why it's used in that Bourne script. It's used in favor of # for comments because #, evidently, might not be a valid comment desig...
Python: split a list based on a condition?
...goodvals]
bad = [x for x in mylist if x not in goodvals]
is there a more elegant way to do this?
That code is perfectly readable, and extremely clear!
# files looks like: [ ('file1.jpg', 33L, '.jpg'), ('file2.avi', 999L, '.avi'), ... ]
IMAGE_TYPES = ('.jpg','.jpeg','.gif','.bmp','.png')
im...
SQL (MySQL) vs NoSQL (CouchDB) [closed]
... manual
over automatic transmission. Secondly,
NoSQL allows you to eke more
performance out of the system by
eliminating a lot of integrity checks
done by relational databases from the
database tier. Again, this is similar
to how you can get more performance
out of your car by drivin...
Div width 100% minus fixed amount of pixels
...
|
show 6 more comments
773
...
Obtain form input fields using jQuery?
...
In newer versions of jQuery, Simon_Weaver's answer is more robust and easier.
– MightyE
May 3 '10 at 21:27
1
...
UITapGestureRecognizer - single tap and double tap
...l not working. There must still be something I'd missed. Do you have any more hint ?
– Stanley
Jan 16 '12 at 6:27
ca...
Set select option 'selected', by value
...
|
show 9 more comments
448
...