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Typing math
Regions, definitions, results and the keys that build math.
A worksheet is a page of regions. Click on the paper where a region should go, and type. Math calculates from the top of the page down, and from left to right along a line, so a name must be defined above or to the left of where it's used.
Type : for the definition sign :=, and = after an expression to see its value. Press Enter or Esc, or click elsewhere, to finish. Type " on empty paper to start a text region instead.
Keys
| : | Definition, := |
| = | Show the value |
| * | Multiply, · |
| / | Fraction |
| ^ | Power |
| ( | Brackets, closed for you; ) steps out of them |
| [ | Subscript: an array element, as v[2 for v₂ |
| . | After a letter: a name's literal subscript, as R.load |
| ; | Range, as 0;10 for 0..10 |
| Space | Select more of the expression, a level at a time |
| Tab | Next blank ■ to fill in |
| Ctrl+G | Turn the letter before the caret into Greek, as w into ω |
| Ctrl+M | Matrix |
| & | Definite integral |
| ? | Derivative |
| Ctrl+Shift+? | Nth derivative |
| Ctrl+Shift+4 | Sum |
| Ctrl+Shift+3 | Product |
| $ | Sum over a range variable |
| # | Product over a range variable |
| Ctrl+. | Evaluate symbolically, → |
| @ | On empty paper: an X-Y plot |
| " | On empty paper: a text region |
| ] | In a program: a new line |
| { | In a program: local definition, ← |
| } | In a program: if |
| F1 | Help on the function being typed |
| Esc | Finish typing; with nothing open, stop a calculation |
| Ctrl+Z, Ctrl+Y | Undo and redo |
Names are letters, digits and _; a name like R.load has a literal subscript. Functions are called by name with their arguments in brackets, as sin(x). A function of your own is defined like a variable: f(x):x^2.
The LIVE button at the right of the toolbar switches to EDIT, which stops calculating; results gray as they go out of date, and LIVE brings them up to date.