Archive for November, 2012

Updating Scisoft in Fedora is rather easy (see the installation details). First if we have already a previous installation we can easily remove it by running (as root): yum remove scisoft-\* and check that the directory /scisoft has been totally removed (if something extra has been added the we should still see the scisoft directory […]

A quick note on how to backup and restore (if necessary) the filesystem. We go to the root directory (/) and as root we run: tar cvpzf backup.tgz –exclude=/lost+found –exclude=/backup.tgz / c: create new archive v: verbose p: preserve permissions z: gzip f: use file (name of file=backup.tgz) We exclude all the directories that we […]

While manipulating some data I came across to, what looked, a strange behavior with the errorbar of matplotlib, when plotting the results from linear to logarithmic scale. Suppose these data: import matplotlib.pyplot as plt import numpy as np s=[19.0, 20.0, 21.0, 22.0, 24.0] v=[36.5, 66.814250000000001, 130.17750000000001, 498.57466666666664, 19.41] verr=[0.28999999999999998, 80.075044597909169, 71.322124839818571, 650.11015891565125, 0.02] plt.errorbar(s,v,yerr=verr) plt.show() […]

Neptune and Triton from Skinakas

By grigoris | Filed in Astronomy