Mrt M

Scientific setup on fresh Fedora 23 installation

su -
dnf update

RPM Fusion repository
http://rpmfusion.org/Configuration

Install the missing software:

dnf install gnome-tweak-tool gimp inkscape thunderbird bluefish filezilla vlc python-openoffice epiphany

dnf install VirtualBox
dnf install dconf-editor

Software for development

dnf groupinstall "Development Tools"

Scientific software

dnf install numpy scipy python-matplotlib python-pandas python-ipython

Upgrade SciPy

dnf install python-pip blas-devel lapack-devel gcc-c++ rpm-build
dnf groupinstall "Development Tools"
pip install --upgrade scipy

How to upgrade SciPy on Fedora 23

As it was with Fedora 22, the Fedora 23 still ships with SciPy version 0.14.1. To upgrade SciPy please run the following commands as root:

dnf install python-pip dnf install blas-devel dnf install lapack-devel dnf install gcc-c++ dnf groupinstall "Development Tools"

If you now try to upgrade scipy you will get the following error
g++: error: /usr/lib/rpm/redhat/redhat-hardened-cc1: No such file or directory

On Fedora 23 one has also to install rpm-build to avoid errors during compilation of scipy:
dnf search rpm-build

Finally uninstall scipy 0.14.1, download 0.16.0, compile it and install. All with the following command:
pip install --upgrade scipy

How to play encrypted DVDs on Fedora 22

Solution found here: http://forums.fedoraforum.org/showthread.php?t=304745

First become root:

su -

Then execute these 7 commands:

dnf install dh-autoreconf
git clone git://git.videolan.org/libdvdcss
cd libdvdcss/
autoreconf -i
./configure --prefix=/usr
make
make install

Things to do after fresh Fedora 22 installation

After fresh Fedora 22 install, first update the preinstalled software.
The prerequisite to all af the following commands is root access.
su - dnf update

Add Fusion repository (found this on fosspedro.wordpress.com)
dnf install --nogpgcheck http://download1.rpmfusion.org/free/fedora/rpmfusion-free-release-22.noarch.rpm http://download1.rpmfusion.org/nonfree/fedora/rpmfusion-nonfree-release-22.noarch.rpm

Run the update again
dnf update

Install the missing software:

dnf install gnome-tweak-tool gimp inkscape thunderbird bluefish filezilla vlc python-openoffice dnf install VirtualBox dnf install dconf-editor dnf install epiphany

Software for development
dnf groupinstall "Development Tools"

Scientific software
dnf install numpy scipy dnf install python-matplotlib dnf install python-pandas dnf install python-ipython

Fedora 22 ships with SciPy version 0.14. To upgrade to 0.15.1 follow these instructions: How to upgrade SciPy on Fedora
To check SciPy version, in python console type:
import scipy scipy.__version__

How to upgrade SciPy on Fedora 22

dnf install python-pip dnf install blas-devel dnf install lapack-devel dnf install gcc-c++ yum groupinstall "Development Tools" pip install --upgrade scipy

How to delete columns in numpy.array

a=array([[ 0, 1, 2, 3], [ 4, 5, 6, 7], [ 8, 9, 10, 11], [12, 13, 14, 15]])
delete(a, s_[1:3], axis=0) # remove rows 1 and 2

output: array([[ 0, 1, 2, 3], [12, 13, 14, 15]])

delete(a, s_[1:3], axis=1) # remove columns 1 and 2
output: array([[ 0, 3], [ 4, 7], [ 8, 11], [12, 15]])

Solution found here: http://stackoverflow.com/questions/1642730/how-to-delete-columns-in-numpy-array

scipy.odr.odrpack.odr_error: number of observations do not match

When the length of t does not match the length of observations array, it may couse this error

t = np.linspace(0.5, 54.5, 18)

P = [29.976, 193.96, 362.64, 454.78, 498.42, 517.14, 515.76, 496.38, 472.14, 432.81, 386.95, 352.93, 318.93, 279.47, 260.19, 230.92, 202.67, 180.3, 159.09, 137.31, 120.47, 104.51, 99.371, 89.606, 75.431, 67.137, 58.561, 55.721]

data = Data(t, P)

When the length of t and P are different, program ends with the error “scipy.odr.odrpack.odr_error: number of observations do not match”

I found the solution in http://php.net/manual/en/function.pg-escape-bytea.php

// Escape image data
$escaped = pg_escape_bytea($data);

// The wrong code, which stopped working after Postgres update
pg_query("INSERT INTO gallery (name, data) VALUES ('Pine trees', E'$escaped')");

// The right code
pg_query("INSERT INTO gallery (name, data) VALUES ('Pine trees', '$escaped')");