Math

A simple program to show how one might use mathjs (https://mathjs.org).

• run: https://RichCaloggero.github.io/math/math.html
• code: https://raw.githubusercontent.com/RichCaloggero/math/master/math.html

Accessibility

• type expression and press enter or click
  • both expression and result copied to output pane
  • new entries are announced automatically by the screen reader as they are added
  • checking the "announce only result" checkbox will announce only the result rather than both expression and result
• history + upArrow moves back through history and places item into input field + tabbing back through history announces both input and result; press enter to place input expression into input field

• clicking on a history entry places the input expression into the input field
• checking the "announce only result" checkbox will announce only results as you walk the history

• the last result is stored in the variable $_ (dollar underscore)

Example

• 2 + 2

  • announces 2 + 2, 4
  • both 2 + 2 and 4 are now displayed in history
  • shift+tab announces "2 + 2, 4"
  • pressing upArrow puts "2 + 2" back into the input field; pressing enter evaluates it

• derivative("2x+3x", "x")

  • 5

• simplify("2x + 3x")

  • 5x

• derivative($_, "x")

  • 5