YHaruoka

import numpy as np

matrix1 = np.array([[1, 2], 
                   [3, 4]])
det1 = np.linalg.det(matrix1)
print(det1)

matrix2 = np.array([[1, 2, 3], 
                   [4, 5, 6],
                   [7, 8, 9]])

YHaruoka

ffmpeg -i input1.mp4 -i input2.mp4 -filter_complex "hstack" output.mp4
ffmpeg -i input1.mp4 -i input2.mp4 -filter_complex "vstack" output.mp4
ffmpeg -i input1.mp4 -i input2.mp4 -i input3.mp4 -filter_complex "[0:v][1:v][2:v]hstack=inputs=3[v]" -map "[v]" output.mp4
ffmpeg -i input1.mp4 -i input2.mp4 -i input3.mp4 -filter_complex "[0:v][1:v][2:v]vstack=inputs=3[v]" -map "[v]" output.mp4
ffmpeg -i input1.mp4 -i input2.mp4 -i input3.mp4 -i input4.mp4 -filter_complex "[0:v][1:v][2:v][3:v]xstack=inputs=4:layout=0_0|w0_0|0_h0|w0_h0[v]" -map "[v]" output_hstack.mp4
ffmpeg -i input1.mp4 -i input2.mp4 -i input3.mp4 -filter_complex  "[0:v][1:v][2:v]xstack=inputs=3:layout=0_0|w0_0|0_h0[v]" -map "[v]" output.mp4
pause

YHaruoka

@echo off
 
setlocal enabledelayedexpansion
 
for /l %%a in (1,1,1000) do (
  set num=000%%a
  set num=!num:~-4,4!
  echo !num!
 )
 

YHaruoka

\documentclass{article}
\usepackage{color}

\begin{document}

\section*{Color test 2}

\textcolor[rgb]{0.1, 0.5, 0.1}{test}
\textcolor[rgb]{0.8, 0.5, 0.3}{test}
\textcolor[rgb]{0.7, 0.4, 0.9}{test}

YHaruoka

\documentclass{article}
\usepackage{xcolor}

\begin{document}

\section*{Color test}

\noindent
\textcolor{black}{testBlack} \\
\textcolor{darkgray}{testDarkgray} \\

YHaruoka

@echo off

for %%i in (*) do (
	echo %%i >> filelist1.txt
)

for %%i in (*.jpg) do (
	echo %%i >> filelist2.txt
)

YHaruoka

@echo off

for /l %%i in (0,1,10) do (
	echo %%i
)

pause

YHaruoka

import numpy as np
from pygsp import graphs, filters

G = graphs.Logo()
G.estimate_lmax()
g = filters.Heat(G, tau=100)
DELTAS = [20, 30, 1090]
s = np.zeros(G.N)
s[DELTAS] = 1
s = g.filter(s)

YHaruoka

ffmpeg -i input.mp4 -vf thumbnail=1000,scale=384:216 -frames:v 1 output.png
pause

YHaruoka

ffmpeg -i input.mp4 -vf pad=w=iw+40:h=ih+40:x=20:y=20:color=white output_pad_white.mp4
ffmpeg -i input.mp4 -vf pad=w=iw+40:h=ih+40:x=20:y=20:color=black output_pad_black.mp4
ffmpeg -i output_pad_black.mp4 -s 1920x1080 output_pad_black_resized.mp4
pause