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Check for installed packages before running install.packages() [duplicate]
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Does not work on my linux machine (works fine on my windows machine). Two possible reasons: (1) system.file does not look in all .libPath() locations, and (2) my conda based R installation alters the .libPaths in some way.
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Simulate limited bandwidth from within Chrome?
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If you are running Linux, the following command is really useful for this:
trickle -s -d 50 -w 100 firefox
The -s tells the command to run standalone, the -d 50 tells it to limit bandwidth to 50 KB/s, the -w 100 set the peak detection window...
Getting individual colors from a color map in matplotlib
...e where we make CSV representation for a custom colormap:
#! /usr/bin/env python3
import matplotlib
import numpy as np
vmin = 0.1
vmax = 1000
norm = matplotlib.colors.Normalize(np.log10(vmin), np.log10(vmax))
lognum = norm(np.log10([.5, 2., 10, 40, 150,1000]))
cdict = {
'red':
(
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How to check if a file is empty in Bash?
...ic etc. for example :
Example 1 : Basic if statement
# BASH4+ example on Linux :
typeset read_file="/tmp/some-file.txt"
if [ ! -s "${read_file}" ] || [ ! -f "${read_file}" ] ;then
echo "Error: file (${read_file}) not found.. "
exit 7
fi
if $read_file is empty or not there stop the show...
Is it good style to explicitly return in Ruby?
Coming from a Python background, where there is always a "right way to do it" (a "Pythonic" way) when it comes to style, I'm wondering if the same exists for Ruby. I've been using my own style guidelines but I'm thinking about releasing my source code, and I'd like it to adhere to any unwritten rule...
What's the difference between [ and [[ in Bash? [duplicate]
...faster which makes your life easier. Get the nitty gritty from a good UNIX/Linux reference. You may find some of the nitty gritty to be useful in certain circumstances, but you will always appreciate clear code! Which script fragment would you rather read? Even out of context, the first choice is ea...
Using ls to list directories and their total sizes
..., I'm sure there is someone who could help. This question is tagged as GNU/linux
– Sebi
Jan 25 '17 at 11:35
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javac : command not found
...pment Kit (JDK). You're best off getting this from the Oracle site: as the Linux repos may be slightly behind with latest versions and also they seem to only supply the open-jdk as opposed to the Oracle/Sun one, which I would prefer given the choice.
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Determining type of an object in ruby
I'll use python as an example of what I'm looking for (you can think of it as pseudocode if you don't know Python):
5 Answe...
SVN upgrade working copy
...tarting from 1.6 redfinsolutions.com/blog/update-subversion-mac-os-x . For Linux, I imagine it's similar.
– Mike Eng
Sep 9 '13 at 18:59
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