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What is the difference between atan and atan2 in C++?
...tan2 allows calculating the arctangent of all four quadrants. std::atan only allows calculating from quadrants 1 and 4.
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iOS Image Orientation has Strange Behavior
...ges in objective-c and noticing a lot of strange behavior. First, like many other people, I've been having this problem where images taken with the camera (or taken with somebody else's camera and MMS'd to me) are rotated 90 degrees. I wasn't sure why in the world this was happening (hence my que...
How to append rows to an R data frame
...ave looked around StackOverflow, but I cannot find a solution specific to my problem, which involves appending rows to an R data frame.
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Changing the “tick frequency” on x or y axis in matplotlib?
I am trying to fix how python plots my data.
11 Answers
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Awaiting multiple Tasks with different results
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After you use WhenAll, you can pull the results out individually with await:
var catTask = FeedCat();
var houseTask = SellHouse();
var carTask = BuyCar();
await Task.WhenAll(catTask, houseTask, carTask);
var cat = await catTask;...
Equivalent of Math.Min & Math.Max for Dates?
What's the quickest and easiest way to get the Min (or Max) value between two dates? Is there an equivalent to Math.Min (& Math.Max) for dates?
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Can you detect “dragging” in jQuery?
...own, start set the state, if the mousemove event is fired record it, finally on mouseup, check if the mouse moved. If it moved, we've been dragging. If we've not moved, it's a click.
var isDragging = false;
$("a")
.mousedown(function() {
isDragging = false;
})
.mousemove(function() {
isDrag...
How to determine whether an object has a given property in JavaScript
How can I determine whether an object x has a defined property y , regardless of the value of x.y ?
7 Answers
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How do I compute derivative using Numpy?
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You have four options
Finite Differences
Automatic Derivatives
Symbolic Differentiation
Compute derivatives by hand.
Finite differences require no external tools but are prone to numerical error and, if you're in a multi...
d3 axis labeling
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Axis labels aren't built-in to D3's axis component, but you can add labels yourself simply by adding an SVG text element. A good example of this is my recreation of Gapminder’s animated bubble chart, The Wealth & Health of Nations. The x-axis label looks like this:
svg.appe...