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How to remove leading zeros from alphanumeric text?
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19 Answers
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How to append rows to an R data frame
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115
Update
Not knowing what you are trying to do, I'll share one more suggestion: Preallocate vec...
Wildcards in a Windows hosts file
...t as I develop multiple sites, I can just add vhosts to Apache called site1.local , site2.local etc, and have them all resolve to localhost , while Apache serves a different site accordingly.
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adding noise to a signal in python
I want to add some random noise to some 100 bin signal that I am simulating in Python - to make it more realistic.
7 Answer...
How do I catch a numpy warning like it's an exception (not just for testing)?
... for numpy.seterr:
>>> import numpy as np
>>> np.array([1])/0 #'warn' mode
__main__:1: RuntimeWarning: divide by zero encountered in divide
array([0])
>>> np.seterr(all='print')
{'over': 'warn', 'divide': 'warn', 'invalid': 'warn', 'under': 'ignore'}
>>> np.arr...
Emulate ggplot2 default color palette
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It is just equally spaced hues around the color wheel, starting from 15:
gg_color_hue <- function(n) {
hues = seq(15, 375, length = n + 1)
hcl(h = hues, l = 65, c = 100)[1:n]
}
For example:
n = 4
cols = gg_color_hue(n)
dev.new(width = 4, height = 4)
plot(1:n, pch = 16, cex = 2, col...
Programmatically create a UIView with color gradient
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19 Answers
19
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How is a CRC32 checksum calculated?
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118
The polynomial for CRC32 is:
x32 + x26 + x23 + x22 + x16 + x12 + x11 + x10 + x8 + x7 + x5 ...
Case preserving substitute in Vim
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121
Use abolish.vim:
:%S/badjob/goodjob/g
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