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WyeSoft Lua Calc is a highly customisable scientific calculator, powered by the Lua scripting language. Knowledge of Lua scripting is not required to use Lua Calc as a scientific calculator, but it will allow you to use the software for more complex tasks, as you can make use of Lua functions in your calculations.
The scientific keypad is made up of 42 customisable keys (84 including the shifted versions), which can be configured to perform virtually any mathematical function. There is also a basic keypad which allows you to use Lua Calc as a simple calculator with larger buttons. Variables can be stored and recalled, and it is even possible to save them between sessions.
As well as a powerful calculator, Lua Calc can be a great aid to programmers, and can even help with learning Lua or programming in general.
You can enter both evaluations and statements into the input field. If the current input can be treated as an evaluation, such as 6+7, the enter button between the input and output fields will turn green and its caption will change to "Calculate". If a valid statement has been entered, which cannot be treated as an evaluation, such as x=30, the enter button will turn blue and read "Execute". If the input field contains neither a valid evaluation nor a valid statement, the button will turn red and its caption will disappear.
The output from the most recent calculation is always stored in the ans variable. This can be used to make a new calculation based on the result of the previous one. For example, you could enter ans+8 and tap the enter button repeatedly to have Lua Calc count upwards in 8's.
When using the onscreen keypad, starting a new command with an operator or a function, rather than a number, will cause Lua Calc to insert ans at the beginning (or in the appropriate place) automatically. For example, if you make a calculation and then start the next command with the + symbol, it will become ans+.
To open the key editor, tap the Edit key so that it lights up in purple, and then tap on the keypad key you wish to edit. Now, for both the shifted and unshifted versions of the key, enter the text you want displayed on the key under "Label" and the text you want to be inserted when tapping on the key under "Insert".
The following special codes can be used in the Insert fields:
You can set the colour of the key by entering values between 0 and 255 in the Red, Green and Blue fields. The higher the number, the more of that primary colour is mixed into the key colour. For example, 128,0,255 will make the button purple.
A Lua table with the name, saved, is automatically created upon launching Lua Calc. The contents of this table will be saved and loaded between sessions, so it can be used to store numbers and other variables for future use. For example, if you were to enter saved.x=60 and then close Lua Calc, the next time you load the app, you could enter saved.x to recall the value of 60.
A string called savedjson, always contains a JSON-formatted copy of the saved table. This can be used to quickly check the entire contents of the table.
Note that functions cannot be stored in the saved table, at least not between sessions. It is, however, possible to store code in strings and run it using Lua's loadstring function.
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