# 2D Graph Tool for Plotting Expressions of the Form of "y = f(x)"

This VCSSL program is a simple tool which plots the expression (formula) of the form of "y = f(x)" to the 2D graph.

## How to Use

### Requirements

- Java® is required to run this program.
- This program is available for PC only. If you are browsing this page on a smartphone, please open this page on a PC before taking the following procedure.

### Download and Launch this program

At first, click the "Download and Run" button at the above of the title of this page by your PC. Then a ZIP file will be downloaded, so please extract it (by selecting "Extract All" from right-clicking menu).

Next, open the extracted folder and execute "VCSSL.jar" (Executable JAR File). You may execute the JAR "VCSSL.jar" file by double-clicking, or opening by Java® Runtime Environment (JRE) from right-clicking menu, etc.

### If you want to edit this program...

Execute "VCSSL_Editor.jar" instead of "VCSSL.jar" to edit this program. Then a program-editor window will be launched. You can execute the edited program by clicking the blue-triangle button at the left-bottom of the editor window.

This program is written in the VCSSL programming language. It has simple C-like syntax, so if you are accustomed with C-like language (e.g. C, C++, C#, Java®), you might be able to custom this program.

### After Launching

#### Windows and UI

The following two-windows will be launched. The left one is the input-window, and the right one is the graph-window.

#### Input an Expression to Plot

At first, please input an expression you want to plot into the text field labeled with "y(x) =" at the top of the input-window. There are some points to write the expression:

- Use small character for "x".
- Arithmetic operations such as "+" and "-" are available. However, some symbols of operators are different with handwriting expressions. Use "*" for multiplication, and use "/" for division.
- Multiplication and division are prior in calculation order than addition and subtraction.
- You can mathmatical functions such as "sin" and "cos" in the expression. The value of circle ratio is available as "PI" (capital character).
- The exponentiation operator is "**". For example, x2 should be written as "x**2" in the expression.

#### Plot a Graph

After inputting the expression, please click "PLOT" button at the middle of the input-window, and the expression will be plot to the 2D graph.

The graph will be drawn as a lines-and-points* graph of "x-N" nodes. You can modify the value of "x-N" on the input-window. Larger value of "x-N" makes graph more smooth.

* If you plot lines-only graph, please see Other Features.

#### Plot new Expressions over the Current Graph

If you want to plot other expressions over the current graph, simply modify the expression of "y(x) =" text-field, and click again "PLOT" button. The new expression will be plotted over the current graph by using a different color.

#### Clear All Contents of the Current Graph

If you want to clear all contents of the current graph, please click "CLEAR" button at middle of the input-window.

#### Other Features

With the default settings, the graph will be plotted as a lines-and-points graph. If you want to plot a lines-only graph, please disable the checkbox of "With Points" from the "Option" menu at the top of the graph-window. In addition, if you want to change the width of lines, please disable and re-enable "With Lines" option, and you will be asked the line width.

You can modify other settings from "Edit" menu at the top of the graph-window, e.g. X & Y ranges of the graph, labels of X & Y axes, legends for each lines of the graph, etc.

You also can save settings and save the image of the current graph, from "File" menu at the top of the graph-window.

The 2D graph software "RINEARN Graph 2D" is used as the graph-window of this program. If you like UI and operability of the graph-window of this program, please try to use RINEARN Graph 2D for your data-analysis use.

» More Details

## Code

This code is written in VCSSL.