大约有 43,400 项符合查询结果（耗时：0.0483秒） [XML]
Remove NA values from a vector
..., etc.)
Setting na.rm=TRUE does just what you're asking for:
d <- c(1, 100, NA, 10)
max(d, na.rm=TRUE)
If you do want to remove all of the NAs, use this idiom instead:
d <- d[!is.na(d)]
A final note: Other functions (e.g. table(), lm(), and sort()) have NA-related arguments that use d...
What is the PostgreSQL equivalent for ISNULL()
...
|
edited Jan 14 '12 at 2:28
Erwin Brandstetter
439k9696 gold badges809809 silver badges969969 bronze badges
...
How to convert URL parameters to a JavaScript object?
... the answer based on the comments.
var search = location.search.substring(1);
JSON.parse('{"' + decodeURI(search).replace(/"/g, '\\"').replace(/&/g, '","').replace(/=/g,'":"') + '"}')
Example
Parse abc=foo&def=%5Basf%5D&xyz=5 in five steps:
decodeURI: abc=foo&def=[asf]&xyz=...
Error while pull from git - insufficient permission for adding an object to repository database .git
...
|
edited Dec 15 '16 at 23:25
answered Nov 5 '13 at 23:20
...
How to keep Maven profiles which are activeByDefault active even if another profile gets activated?
...
154
One trick is to avoid activeByDefault, and instead activate the profile by the absence of a pr...
How can you hide database output in Rails console?
...
178
A better way of doing this is by typing this into the console:
ActiveRecord::Base.logger.leve...
Programmatically retrieve memory usage on iPhone
...
135
To get the actual bytes of memory that your application is using, you can do something like th...
Extract a dplyr tbl column as a vector
...
188
With dplyr 0.7.0, you can use pull to get a vector from a tbl.
library("dplyr")
#>
#&g...
What does multicore assembly language look like?
...
10 Answers
10
Active
...