Computational Environmental Physics Lab (CEPL)

Include this package in the header part,

\usepackage{datetime2}

within

\date{created on Sun Feb 13 10:00:15 AM HST 2022, last modified on \DTMnow}

Convert a mp4 file into wav file

ffmpeg -i file.mp4 -ar 16000 -ac 1 file.wav

convert the wav file into a text file

pocketsphinx_continuous -infile file.wav 2> pocketsphinx.log > myspeech.txt

https://guides.github.com/activities/hello-world/

mkdir  ~/usr/share/texlive/texmf/
cd 
ln -s  ~/usr/share/texlive/texmf/  ~/texmf
cd texmf
mkdir -p latex
# put all the necessary .bst .sty files  inn this directory
# to update TeX information
cd ~/texmf
sudo texhash

# for Lyx
# go to Tools -> Reconfigure
# this will take more than 10 seconds
# close Lyx application and restart it.

\renewcommand\refname{}

awk command in a bash script

#!/bin/bash 
myfile="myfile.dat"
cat $myfile
echo

echo -e "\nRow sum: method 1"
awk 'BEGIN{j=1;}{
for (i=1; i<=NF; i++) 
rowsum[j]+=$i; 
j++;
};
END{
for (k in rowsum)
print "the sum of row "k" is " rowsum[k];
}' $myfile

echo -e "\nColumn sum: method 1"
awk 'BEGIN{;}{
for (i=1; i<=NF;i++) 
colsum[i]+=$i;}; 
END{
for (k in colsum) print "the sum of column "k" is " colsum[k];
}' $myfile

 

mydata.dat file

124 127 130
112 142 135
175 158 245
118 231 147

DIR_ID := $(shell date +"d%Y%m%dt%H%M%Sm%3N")
# this command will provide a directory name 
# having a format of d20201214t234015m289
# which contains date(YYYYMMDD) after the first "d"
# time (hhmmss) after "t" and millisecond (NNN) after "m".
# The millisecond is added not to have same directory names. 

all:
	@echo $(DIR_ID)
	mkdir -p $(DIR_ID)

In command line, one can execute to have 10 different directories in sequence.

$ for i in $(seq 1 10); do echo $i; make ; done

;; elisp code for Emacs to scroll every line

(setq scroll-step            1
      scroll-conservatively  100000)