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LaTeX memo

Math

• Vector \overrightarrow{a} (wider) vs \vec{a} (shorter)
• Matrix and Determinant \begin{pmatrix} ... \end{pmatrix} (parentheses) or begin{vmatrix} ... \end{vmatrix} (simple vertical bar). Each of elements are separated by ampersand &, each of rows are separated by //
• Cofactor \widetilde{A} (wider) vs \tilde{A} (shorter)
• Minor determinant \overline{A} (wider) vs \bar{A} (shorter)
• other symbols: amssymb

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GNUPLOT References

• power is ** (not ^)
• show variables
• e = 2.7182818284 naiper's constant is not defined by default
• unset key
• set size ratio -1
• set autoscale
• set margin and set bmargin
• set xrange[0:1] and set xrange[0:1]

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windbg, windbgx quick reference

Windbgx does not support UTF-16 with nobomb

In vim, change fileformat by using :set fenc=utf-16 | set bomb.

must read

• syntax rule
• tutorial

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LaTeX to PNG on Windows

Prerequisite

• Windows System (Tested on Windows 10)
• pdflatex TexLive (/w standalone package)
  • Installing Tex Live over the Internet
• magick Image Magick
  • choco install imagemagick
• gswin32c Ghost Script (x86)

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• https://stackoverflow.com/questions/1269603/to-switch-from-vertical-split-to-horizontal-split-fast-in-vim#1269631

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#include <vector>
int main() {
  struct t{ int i1; int i2; };
  std::vector<t> v;
  v.push_back(t {1, 2});
  v.push_back(t {3, 4});
  v.push_back(t {5, 6});
  for(int l = v.size(), c = 0; c < l; c++)
    printf("%d, ", (v.data() + c)->i2);
}

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#include <string>
#include <vector>

void main() {
  std::string foo = "baz";
  std::vector<char> bar;
  printf("%d\n", bar.capacity());
  bar.resize(foo.size());
  // CAUTION: vector::reserve affects only "capacity", so does not change its "size",
  // will causes empty-like behavior if using for(:) loop, vector::resize is adequate.

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Install Latest GCC on Ubuntu

sudo add-apt-repository ppa:ubuntu-toolchain-r/test
sudo apt-get update
sudo apt-get install gcc-8 g++-8
sudo update-alternatives --install \
 /usr/bin/gcc gcc /usr/bin/gcc-4.9 60 \
 --slave /usr/bin/g++ g++ /usr/bin/g++-4.9

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Various way to achieve output from other executable

stdin w/ terminal script

#include <stdio.h>

int main() {
  char buffer[256];
  while (fgets(buffer, sizeof(buffer), stdin))

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REM This snippet sort *.ts files in numerical order. Up to 9999. (1.ts - 9999.ts)
@echo off
setlocal enabledelayedexpansion
(
  for /f %%f in ('dir /b *.ts') do (
    set num=%%~nf
    set elif=1
    if !elif! equ 1 if !num! lss 10   set "num=000!num!" && set elif=0
    if !elif! equ 1 if !num! lss 100  set "num=00!num!"  && set elif=0
    if !elif! equ 1 if !num! lss 1000 set "num=0!num!"   && set elif=0