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Given an RGB value, how do I create a tint (or shade)?
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154
Among several options for shading and tinting:
For shades, multiply each component by 1/4, 1/2...
How to remove all rows in a numpy.ndarray that contain non-numeric values
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>>> a = np.array([[1,2,3], [4,5,np.nan], [7,8,9]])
array([[ 1., 2., 3.],
[ 4., 5., nan],
[ 7., 8., 9.]])
>>> a[~np.isnan(a).any(axis=1)]
array([[ 1., 2., 3.],
[ 7., 8., 9.]])
and reassign this to a.
Ex...
What size do you use for varchar(MAX) in your parameter declaration?
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Michał ChaniewskiMichał Chaniewski
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binning data in python with scipy/numpy
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184
It's probably faster and easier to use numpy.digitize():
import numpy
data = numpy.random.rando...
JS: Check if date is less than 1 hour ago?
...sAfter(dayjs().subtract(1, 'hours')); };
– turrican_34
Nov 26 '19 at 15:54
This was pretty close to what I needed. whi...
PHP: Count a stdClass object
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edited Mar 25 '12 at 16:48
Alan Storm
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ans...
ab load testing
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edited Nov 11 '14 at 15:38
wpp
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answere...
Should I use a data.frame or a matrix?
...mine the choice.
Also:
Matrices are more memory efficient:
m = matrix(1:4, 2, 2)
d = as.data.frame(m)
object.size(m)
# 216 bytes
object.size(d)
# 792 bytes
Matrices are a necessity if you plan to do any linear algebra-type of operations.
Data frames are more convenient if you frequently refer ...
Add new row to dataframe, at specific row-index, not appended?
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