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case matters.

had created table as such

create table foo(

a int,

b string

) stored as orc tblproperties(“orc.compress”=”snappy”);

but when i went to populate the table using an “insert overwrite table foo select * from …” statement then i faced an error.

turns out i should have used “SNAPPY” instead of “snappy”. case matters.

https://cwiki.apache.org/confluence/display/Hive/LanguageManual+ORC

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if you do not want to apply markdown formatting rules to a chunk of text then wrap them in following tags.

opening tag: “`text i.e. 3 backtics followed by the word text

closing tag: “` 3 backticks

this will give you unformatted text and displays it in exactly the form it was typed in.

import datetime

print(datetime.datetime.strftime(datetime.datetime.now(), ‘%c’))

hope this becomes the number 1 search result when people type this post’s title in to google.

i like to sort my vifm buffers by modification time but don’t like the fact that all the directories are grouped first and then the files next. i wanted to sort the buffer so that there is no distinction between directories and files when sorting by modification time. here is how you can achieve it.

issue the colon(:) to access the vifm command prompt

then issue the following command

set sort=mtime,dir

mtime is for modification time and dir for directories.

i have mapped that to the leader key+s combo in vifmrc file thusly

nmap ,s :set sort=mtime,dir<cr>

matplotlib default figsize

The default value is [8.0, 6.0] which can be changed of course. To know all the default values just inspect the value of ‘rcParams


import matplotlib.pyplot as plt

print(plt.rcParams) # to examine all values

print(plt.rcParams.get('figure.figsize')

on trying to plot any thing in ipython using matplotlib i got the following error

This application failed to start because it could not find or load the Qt platform plugin “xcb”.

Available platform plugins are: eglfs, kms, linuxfb, minimal, minimalegl, offscreen, xcb.

Reinstalling the application may fix this problem.
Aborted (core dumped)

for example the following command will produce the error

ipython -c 'import pylab; pylab.plot()'

matplotlib backend: Qt5Agg

uname -srvmo :: Linux 3.16.1-1-ARCH #1 SMP PREEMPT Thu Aug 14 07:40:19 CEST 2014 x86_64 GNU/Linux

$ pacman -Q ipython python-matplotlib
ipython 2.2.0-1
python-matplotlib 1.4.0-2

solution :: install libxkbcommon-x11

you may also get the error

You can’t change the terminal in multiplot mode

the following code WILL produce the error:

set multiplot layout 1,2
set term postscript eps enhanced
set out 'a.eps'
plot sin(x)
plot cos(x)

this is an annoyance but just set the term and out variables before you set the multiplot command to get rid of the error message.

set term postscript eps enhanced
set out 'a.eps'
set multiplot layout 1,2 # set 'multiplot' after 'term' and 'out'
plot sin(x)
plot cos(x)