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data.frame rows to a list
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Adding another comment from the future, an apply version is .mapply(data.frame, xy.df, NULL)
– alexis_laz
Jul 24 '16 at 8:40
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Difference between single and double square brackets in Bash
... a weird name.
] is just an argument of [ that prevents further arguments from being used.
Ubuntu 16.04 actually has an executable for it at /usr/bin/[ provided by coreutils, but the bash built-in version takes precedence.
Nothing is altered in the way that Bash parses the command.
In particular...
How to plot multiple functions on the same figure, in Matplotlib?
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To plot multiple graphs on the same figure you will have to do:
from numpy import *
import math
import matplotlib.pyplot as plt
t = linspace(0, 2*math.pi, 400)
a = sin(t)
b = cos(t)
c = a + b
plt.plot(t, a, 'r') # plotting t, a separately
plt.plot(t, b, 'b') # plotting t, b separately ...
Immediate function invocation syntax
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From Douglass Crockford's style convention guide: (search for "invoked immediately")
When a function is to be invoked immediately, the entire invocation expression should be wrapped in parens so that it is clear that the val...
Difference between this and self in self-type annotations?
...alias for this in trait A. This is useful for accessing the this reference from an inner class. I.e. you could then use self instead of A.this when accessing the this reference of the trait A from a class nested within it. Example:
class MyFrame extends JFrame { frame =>
getContentPane().a...
differences between 2 JUnit Assert classes
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I believe they are refactoring from junit.framework to org.junit and junit.framework.Assert is maintained for backwards compatibility.
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Why use a prime number in hashCode?
...wer of two, which permits for bitwise optimization
Here's the full quote, from Item 9: Always override hashCode when you override equals:
The value 31 was chosen because it's an odd prime. If it were even and multiplication overflowed, information would be lost, as multiplication by 2 is equivalen...
How do I parallelize a simple Python loop?
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from joblib import Parallel, delayed
import multiprocessing
inputs = range(10)
def processInput(i):
return i * i
num_cores = multiprocessing.cpu_count()
results = Parallel(n_jobs=num_cores)(delayed(processInput)(i) fo...
How can I have linked dependencies in a git repo?
...ub.com/example/some_lib.git lib/some_lib
Note that this needs to be done from the top-level directory in your repository. So don't cd into the directory where you're putting it first.
After you add a submodule, or whenever someone does a fresh checkout of your repository, you'll need to do:
git ...
Find the files existing in one directory but not in the other [closed]
.../tools/tools/LiveSuit_For_Linux64 added
Or if you want to see only files from the first directory:
user@laptop:~$ python3 compare_dirs.py dir2/ dir1/ | grep dir1
DIR dir1/out/flavor-domino added
DIR dir1/target/vendor/flavor-domino added
FILE dir1/tmp/.kconfig-flavor_domino added
P.S. If you...