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Representing and solving a maze given an image
...y), adjusting weights for the colors so that final grayscale image is approximately uniform. You can do it simply by controlling sliders in Photoshop in Image -> Adjustments -> Black & White.
Convert image to binary by setting appropriate threshold in Photoshop in Image -> Adjustments -...
John Carmack's Unusual Fast Inverse Square Root (Quake III)
...uake III source code which calculates the inverse square root of a float, 4x faster than regular (float)(1.0/sqrt(x)) , including a strange 0x5f3759df constant. See the code below. Can someone explain line by line what exactly is going on here and why this works so much faster than the regular im...
Python - How to sort a list of lists by the fourth element in each list? [duplicate]
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unsorted_list.sort(key=lambda x: x[3])
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Search and replace in bash using regular expressions
I've seen this example:
6 Answers
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data.table vs dplyr: can one do something well the other can't or does poorly?
..., not so much with dplyr . I've read through some dplyr vignettes and examples that have popped up on SO, and so far my conclusions are that:
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How to make an array of arrays in Java
... String[][] { array1, array2, array3, array4, array5 };
(The latter syntax can be used in assignments other than at the point of the variable declaration, whereas the shorter syntax only works with declarations.)
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Which is more preferable to use: lambda functions or nested functions ('def')?
...r for an assignment, so the result is the same, and they are a lot more flexible and readable.
lambdas can be used for use once, throw away functions which won't have a name.
However, this use case is very rare. You rarely need to pass around unnamed function objects.
The builtins map() and filte...
Example use of “continue” statement in Python?
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Here's a simple example:
for letter in 'Django':
if letter == 'D':
continue
print("Current Letter: " + letter)
Output will be:
Current Letter: j
Current Letter: a
Current Letter: n
Current Letter: g
Current Letter: o
It ...
Scatterplot with marginal histograms in ggplot2
...elow in ggplot2 ? In Matlab it is the scatterhist() function and there exist equivalents for R as well. However, I haven't seen it for ggplot2.
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