Help - CLP's Nice Calculator

This is an RPN, or stack-based, calculator. You put numbers on the stack, and then you do things to them.

For example, to work out 1 + 3, you'd:

It's a different way of doing things to a normal calculator, but it can be much more efficient for complicated calculations.

This calculator not only displays the results of calculations, but shows you what went into producing them.

The display shows the current stack. Input numbers are shown in blue, and operations are shown in yellow.

Type a number and press Enter to push it onto the stack.

You can tap any item on the stack to select it, or use the arrow keys to move the selection.

When you push a number, it's inserted below the selected item.

Input numbers inside an operation can't be deleted, but they can be changed, moved or copied.

To change a number inside an operation, select it, type the new value, and press Enter.

When you copy a number, it's given a label to identify it. If you change the value of the number, it changes in all the copies too.

Nested operations are folded up by default. Click on an operation to unfold it and see what's inside.

Click on the result value of an operation, or press the ? key to see more digits.

Keyboard commands

If you have a keyboard, you can type numbers and operations. There are also keys for most of the other on-screen buttons.

Key	Action
`↑`	Select the previous item.
`↓`	Select the next item.
`←`	Select the operator above this item.
`→`	Select this item's first argument.
`Shift` `↑`	Switch to the previous screen of buttons.
`Shift` `↓`	Switch to the next screen of buttons.
`v`	Show the named item editor.
`@`	Search for a named item. Type the item's name. As soon as there's only one named item matching what you've typed, it's pushed to the stack. For example, if you have items named `root` and `x`, then typing `@` `r` will push `root` to the stack.
`Escape`	If in the custom function or named value editors, return to the calculator screen. If editing the name of an item, stop editing it.

Key	Command	Action
`Enter`	Enter	Push the number in the input to the stack, below the selected item.
`⌫`	Backspace	Delete the last character of the input.
`	±	Change the sign of the number being entered.
`Delete`	Drop	Remove the selected item from the stack.
`w`	Swap	The selected item and the one above it exchange places.
`d`	Copy	Add a copy of the selected item to the bottom of the stack. Copies of the same number are linked - if you change the value for one, it changes in all the copies too.
`u`	Undo	When you've selected an operation, undo it and leave its arguments in place on the stack.
`?`	Show more digits	When you've selected an operation, expand the result to show more digits. More digits are shown as you scroll down.
`n`	Name	Focus the input to change the name of the selected item.

Key	Command
`+`	$x + y$
`-`	$x - y$
`*`	$x \times y$
`/`	$x \div y$
`s`	$sin (x)$
`c`	$cos (x)$
`t`	$tan (x)$
`S`	${sin}^{- 1} (x)$
`C`	${cos}^{- 1} (x)$
`T`	${tan}^{- 1} (x)$
`^`	$x^{2}$
`r`	$\sqrt{x}$
`p`	$x^{y}$
`l`	$ln (x)$
`L`	$log (x)$
`e`	$e^{x}$
`E`	$10^{x}$
`!`	$x!$
`m`	Mean	The mean of all the items on the stack.
`%`	Mod	The remainder on dividing `x` by `y`
`P`	$π$	Add the constant π to the stack