jepio

-module(qsort).
-export([sort/1,start/0,part/2,qsort/1]).
%% usage: erlc qsort.erl && erl -run qsort -run init stop -noshell

%% easiest way to write a quick sort %%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
sort([Pivot|T]) ->
    sort([ X || X <- T, X < Pivot]) ++
    [Pivot|[Pivot|| X <- T,X == Pivot]] ++
    sort([ X || X <- T, X > Pivot]);

jepio

-module(rev).
-export([start/0,erse/1,erse_tail/1]).

%% recursion with appending
erse([First|Rest]) -> erse(Rest)++[First];
erse([]) -> [].

%% tail recursion
erse_tail(L) -> erse_tail(L,[]).
erse_tail([],New) -> New;

jepio

#!/usr/bin/env bash

rsync -av --delete /home/user user@host:/home/user/backup/

# copy over ssh, with partial (interruption) support, progressbar
rsync -avPh --rsh='ssh' src dest

jepio

#!/usr/bin/env bash

if [[ $# -ne 1 ]]; then
    echo "Specify one folder to compress"
    exit 1
fi
if [[ -d $1 ]]; then
    folder=`basename $1`
    size=`du -sb $1 | cut -f 1`
    tar cfp - $1 | pv -perbt -s $size | bzip2 -c > $folder.tar.bz2

jepio

gcc -### -march=native -x c++ -
# or
gcc -march=native -E -v - </dev/null 2>&1 | grep cc1
# or better yet
gcc -march=native -Q --help=target

jepio

TeX Plots

Generating using ROOT

To generate a plot start by setting the paper size. I have found that sometimes the default canvas size (in pixels) will show, so consider also creating a canvas with a specified size (aspect ratio) beforehand. Next, draw the plot and save it with a .tex extension.

gStyle->SetPaperSize(7.,4.);
plot->Draw();
gPad->Print("plot.tex");

The source file of the plot can be editted after it has been saved - you can change the axis labels, add unicode or latex characters and even change colors/sizes of every element if you're proficient in tikz.

Including in LaTeX.

jepio

diff -u file file_updated > file.patch # creates a patch describing the changes between two files
patch < file.patch # applies the patch to file, making it the same as file_updated (won't change the filename)

jepio

watch --color --exec --interval 0.5 df

jepio

CC=gcc
# Without the fopenmp flag the program will normally still work and be
# completely serial. In this case however it won't because I used omp.h
CFLAGS=-fopenmp -Wall
LDFLAGS=$(CFLAGS)

all: omp_example

omp_example: omp_example.o

jepio

#ifndef __GPU_TIMER_H__
#define __GPU_TIMER_H__

#include <cuda_runtime.h>

struct GpuTimer
{
      cudaEvent_t start;
      cudaEvent_t stop;