# Example of LaTeX preprocessor input written in UDL.
#
# Compile this document to LaTeX using the preprocessor with command:
# cargo run --features="tex" --bin udl-tex-cmd -- examples/equations.tex.u


<documentclass>:article

<usepackage>:amsmath

<begin>:document

<section>:Equations

  # Define a sum-range command.
  <newcommand>:<SumRn>:*:4:{
    <sum>_{#1}^{#2 <dots> #3} #4
  }

  <begin>:math
    <SumRn>:k:0:100:k
    = 0 + 1 + 2 + <dots> + 99 + 100
    = (0 + 100) + (1 + 99) + <dots> (49 + 51) + 50
    = 5050
  <end>:math

  <begin>:math
    <SumRn>:k:0:n:k
    = 0 + 1 + 2 + <dots> + (n - 1) + n
    = n <cfrac>:n:2 + <cfrac>:n:2
    = <cfrac>:n^2:2 + <cfrac>:n:2
    = n <cdot> <cfrac>:{n + 1}:2
  <end>:math

<section>:Matrices

  <begin>:math
    <mathbf>:X = <begin>:bmatrix <@tabulate-sq>:3:[
      1;0;0;
      0;1;0;
      0;0;1;
    ] <end>:bmatrix
  <end>:math

<end>:document