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How to use arguments from previous command?
I know that Esc + . gives you the last argument of the last command.
11 Answers
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Confusion between factor levels and factor labels
...seems to be a difference between levels and labels of a factor in R.
Up to now, I always thought that levels were the 'real' name of factor levels, and labels were the names used for output (such as tables and plots). Obviously, this is not the case, as the following example shows:
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How to modify a global variable within a function in bash?
... tell you, that it is impossible to fix. This is wrong, but it is a long known difficult to solve problem.
There are several ways on how to solve it best, this depends on your needs.
Here is a step by step guide on how to do it.
Passing back variables into the parental shell
There is a way to p...
What can you use Python generator functions for?
...enerator functions, those that have a yield statement in them. I want to know what types of problems that these functions are really good at solving.
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What does -1 mean in numpy reshape?
...haped into a vector using reshape function with parameter -1. But I don't know what -1 means here.
9 Answers
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Random “Element is no longer attached to the DOM” StaleElementReferenceException
...- page is refreshed, or element is removed and re-added
element.click();
Now at the point where you're clicking the element, the element reference is no longer valid. It's close to impossible for WebDriver to make a good guess about all the cases where this might happen - so it throws up its hands...
How do I make JavaScript beep?
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Solution
You can now use base64 files to produce sounds when imported as data URI. The solution is almost the same as the previous ones, except you do not need to import an external audio file.
function beep() {
var snd = new Audio("data...
Convert hex to binary
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I don't know why this was voted up as it doesn't answer the OP's actual request - see any of the other posts for an answer
– David Glance
Jul 18 at 11:37
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Using Python String Formatting with Lists
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The link is now dead.
– M. K. Hunter
Aug 23 '18 at 20:40
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JavaScript get clipboard data on paste event (Cross browser)
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The situation has changed since writing this answer: now that Firefox has added support in version 22, all major browsers now support accessing the clipboard data in a paste event. See Nico Burns's answer for an example.
In the past this was not generally possible in a cross-b...