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How to sort a dataframe by multiple column(s)
I want to sort a data.frame by multiple columns. For example, with the data.frame below I would like to sort by column z (descending) then by column b (ascending):
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Better way to shuffle two numpy arrays in unison
...use the single array for shuffling and the views for all other purposes.
Example: Let's assume the arrays a and b look like this:
a = numpy.array([[[ 0., 1., 2.],
[ 3., 4., 5.]],
[[ 6., 7., 8.],
[ 9., 10., 11.]],
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Getting the minimum of two values in SQL
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better understandable syntax: return(select minValue = case when @@param1 < @@param2 then @@param1 else @@param2 end). Ok this may not be normalized, i don't know. But it's much more understandable and should be normalized.
– S...
“No X11 DISPLAY variable” - what does it mean?
I am trying to install a Java application on my Linux machine (Slackware).
10 Answers
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How to simulate a click by using x,y coordinates in JavaScript?
...entFromPoint and HTMLElement.prototype.click(), since at least IE 6, Firefox 5, any version of Chrome and probably any version of Safari you're likely to care about. It will even follow links and submit forms:
document.elementFromPoint(x, y).click();
https://developer.mozilla.org/En/DOM:document...
Getting command-line password input in Python
You know how in Linux when you try some Sudo stuff it tells you to enter the password and, as you type, nothing is shown in the terminal window (the password is not shown)?
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Changing font size and direction of axes text in ggplot2
I am plotting a graph with a categorical variable on the x axis and a numerical variable on the y axis.
7 Answers
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Return multiple values in JavaScript?
...t = values[0];
var second = values[1];
With the latest ECMAScript 6 syntax*, you can also destructure the return value more intuitively:
const [first, second] = getValues();
If you want to put "labels" on each of the returned values (easier to maintain), you can return an object:
function getV...
How do I delete unpushed git commits?
...EAD~1 will also keep all your changes but will leave you with an empty index rather than keep everything (as the --soft option would).
– Holloway
Aug 27 '14 at 10:05
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