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Fast check for NaN in NumPy
...astest way to check for the occurrence of NaN ( np.nan ) in a NumPy array m>X m> . np.isnan(m>X m>) is out of the question, since it builds a boolean array of shape m>X m>.shape , which is potentially gigantic.
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Selecting only numeric columns from a data frame
...e is a list we can use the list-apply functions:
nums <- unlist(lapply(m>x m>, is.numeric))
Then standard subsetting
m>x m>[ , nums]
## don't use sapply, even though it's less code
## nums <- sapply(m>x m>, is.numeric)
For a more idiomatic modern R I'd now recommend
m>x m>[ , purrr::map_lgl(m>x m>, is.numer...
Is there a way to perform “if” in python's lambda
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The syntam>x m> you're looking for:
lambda m>x m>: True if m>x m> % 2 == 0 else False
But you can't use print or raise in a lambda.
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Calculate the center point of multiple latitude/longitude coordinate pairs
...ion on SO asked about finding the average of a set of compass angles.
An em>x m>pansion of the approach recommended there for spherical coordinates would be:
Convert each lat/long pair into a unit-length 3D vector.
Sum each of those vectors
Normalise the resulting vector
Convert back to spherical coor...
Convert string to a variable name
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assign is what you are looking for.
assign("m>x m>", 5)
m>x m>
[1] 5
but buyer beware.
See R FAQ 7.21
http://cran.r-project.org/doc/FAQ/R-FAQ.html#How-can-I-turn-a-string-into-a-variable_003f
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StringIO in Python3
...se
io.StringIO and it works, but I can't use it with numpy 's genfromtm>x m>t like this:
8 Answers
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Is there a shortcut on Android Studio to convert a tem>x m>t to uppercase?
I'm trying to find a command on Android Studio to convert a selected tem>x m>t to uppercase but I'm unable to do so.
8 Answers
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What is the optimal algorithm for the game 2048?
...tion with a value of either 2 or 4 . The game terminates when all the bom>x m>es are filled and there are no moves that can merge tiles, or you create a tile with a value of 2048 .
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Pythonic way to combine FOR loop and IF statement
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You can use generator em>x m>pressions like this:
gen = (m>x m> for m>x m> in m>x m>yz if m>x m> not in a)
for m>x m> in gen:
print m>x m>
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Sort points in clockwise order?
Given an array of m>x m>,y points, how do I sort the points of this array in clockwise order (around their overall average center point)? My goal is to pass the points to a line-creation function to end up with something looking rather "solid", as convem>x m> as possible with no lines intersecting.
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