大约有 16,000 项符合查询结果（耗时：0.0233秒） [XML]
ggplot with 2 y axes on each side and different scales
I need to plot a bar chart showing counts and a line chart showing rate all in one chart, I can do both of them separately, but when I put them together, I scale of the first layer (i.e. the geom_bar ) is overlapped by the second layer (i.e. the geom_line ).
...
Explain the use of a bit vector for determining if all characters are unique
I am confused about how a bit vector would work to do this (not too familiar with bit vectors). Here is the code given. Could someone please walk me through this?
...
Git merge reports “Already up-to-date” though there is a difference
I have a git repository with 2 branches: master and test.
15 Answers
15
...
How do I calculate percentiles with python/numpy?
...
You might be interested in the SciPy Stats package. It has the percentile function you're after and many other statistical goodies.
percentile() is available in numpy too.
import numpy as np
a = np.array([1,2,3,4,5])
p = np.percentil...
How do I use jQuery's form.serialize but exclude empty fields
I have a search form with a number of text inputs & drop downs that submits via a GET. I'd like to have a cleaner search url by removing the empty fields from the querystring when a search is performed.
...
How do I test if a string is empty in Objective-C?
How do I test if an NSString is empty in Objective-C?
30 Answers
30
...
What does “abstract over” mean?
Often in the Scala literature, I encounter the phrase "abstract over", but I don't understand the intent. For example , Martin Odersky writes
...
How to restore the permissions of files and directories within git if they have been modified?
...t. All the file permissions are different than what git thinks they should be therefore they all show up as modified.
11 An...
Counting Line Numbers in Eclipse [closed]
...n Eclipse? I am familiar with other tools (e.g., Code Analyzer, wc, etc.) but I want to know if there is a way to do this within Eclipse (or get confirmation that there is no way to do it).
...
How to debug Lock wait timeout exceeded on MySQL?
...
What gives this away is the word transaction. It is evident by the statement that the query was attempting to change at least one row in one or more InnoDB tables.
Since you know the query, all the tables being accessed are candidates for being the culprit.
From there, you should be ...