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Speed up the loop operation in R
...on). The data.frame has roughly 850K rows. My PC is still working (about 10h now) and I have no idea about the runtime.
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How to make good reproducible pandas examples
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341
Note: The ideas here are pretty generic for Stack Overflow, indeed questions.
Disclaimer: Writi...
Why does changing 0.1f to 0 slow down performance by 10x?
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1627
Welcome to the world of denormalized floating-point! They can wreak havoc on performance!!!
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How do you detect where two line segments intersect? [closed]
...first line segment (p + t r):
t0 = (q − p) · r / (r · r)
t1 = (q + s − p) · r / (r · r) = t0 + s · r / (r · r)
If the interval between t0 and t1 intersects the interval [0, 1] then the line segments are collinear and overlapping; otherwise they are collinear and disj...
What is the most pythonic way to check if an object is a number?
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14 Answers
14
Active
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Getting random numbers in Java [duplicate]
I would like to get a random value between 1 to 50 in Java.
2 Answers
2
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What's the difference between lapply and do.call?
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127
There is a function called Map that may be similar to map in other languages:
lapply returns...
Normalize data in pandas
...In [92]: df
Out[92]:
a b c d
A -0.488816 0.863769 4.325608 -4.721202
B -11.937097 2.993993 -12.916784 -1.086236
C -5.569493 4.672679 -2.168464 -9.315900
D 8.892368 0.932785 4.535396 0.598124
In [93]: df_norm = (df - df.mean()) / (df.max() - df.min()...