GraphCalc3DS is a graphing calculation utility for the 3DS made by flarn2006. It features variable sliders and equations can both be entered in the regular traditional algebraic notation or in the RPN (Reverse Polish Notation) format.

Installing

Available in 3DSX/SMDH format.

Building

Libraries used:

• sf2dlib, by xerpi (required).
• SF2DBmpFont, by flarn2006 (included in source code download).
• tinyexpr, by codeplea (included as submodule, use git clone --recursive).

About variable sliders

Adjustable variable sliders are a new feature in version 1.3. They enable you to add values to graphs that you can easily adjust and experiment with, without the need to manually enter in different values (which can be annoying if they aren't at the end of the equation). The sliders are on a new page on the screen; press Left/Right on the D-Pad to switch pages.

You will then see four sliders, labeled a, b, c, and d:

• The labels to the left are actually buttons; pressing them will insert the variable into the equation just like the x button on the main page.
• To the right of each slider is a button labeled 0-1. This will reset the range of the slider to the default of 0 to 1.
• You can extend the range of the sliders by holding down L or R while dragging past the left or right.
• You can shorten the range by setting the slider to the value you want to be the minimum or maximum, activating alt-mode (press Select) and pressing the button to the left (for minimum) or right (for maximum) of the slider.

About RPN Format

By default, equations are entered in RPN (Reverse Polish Notation):

• This means, for example, rather than sin(4 + x), you would enter 4 x + sin.
• You can still enter equations the traditional way (e.g. sin(4 + x)) by pressing A and using the on-screen keyboard.
• Pressing A in alt mode will insert the function of X as an RPN function instead of replacing the existing expression.
• If you've entered a number and want to start entering a new number immediately after, press the decimal point key twice, or only once if there's already a decimal point.