CGRAPH allows you to create mathematical graphs quickly and easily. All graphing functions are structured in the same way. The following example shows how to plot a sine function in CGRAPH.

On the left-hand side is a toolbar from which all graphing functions can be accessed. If you hover the mouse pointer over one of the buttons, a tooltip appears showing the name of the graphing function. All graphics functions available in CGRAPH are listed here, and can also be found in the menu

In this example, we will draw a sine curve; for this, CGRAPH offers the graphics type Functions. This is the button in the function bar highlighted in blue in the image.

The window contents now change. On the left (green arrow), a tree appears in which all the contents of a graph are listed and where their colours and appearance can be changed. In the right-hand pane, a window appears containing the default values for the graphing function (red arrow). Furthermore, the function bar on the left-hand side is restricted to all graphing functions that can later be displayed in the same graph window. All others are hidden.

First, we need a function (red frame). When CGRAPH is first launched, some example functions are already predefined – so simply click the arrow to the right of the function field, where the function sin(x) is listed. Of course, the field also allows you to enter the function using the keyboard. A complete overview of all possible functions and the function syntax can be found here.

In the green area, all graphing functions allow you to specify the value range for which a graph is to be drawn. For all graph types, permissible values are already entered here; your changes are saved and will be available immediately the next time you call up the function. A description of the number formats used by CGRAPH can be found here.

For Functions and some other graph types, it is also possible to always fit the graph into the graph window – to do this, leave the Set drawing area field unchecked.

Many graphing functions also offer additional options – for Functions, this includes the ability to display not only the actual function but also its derivatives, integrals and zeroes as part of a curve sketching.

Once the function and, if applicable, the range of values have been specified, the graph can be drawn. To do this, click on Create graph in the blue area. For most graphs, there is also an Export button here, which allows the calculated values of a graph to be saved in a CSV text file and used in other programmes. CGRAPH itself can use these files for the graph types Interpolations and Linear Algebra.

CGRAPH now switches to the Graph tab and displays the sine curve. You can return to the previous settings and modify them at any time – simply click on the (1) Functions tab again (red arrow). Incidentally, the number is sequential – if you run this example after other graphs have already been created, a higher number will appear here.

Below the tabs is a toolbar (green arrow) that can be used to change the view. A print function is also available here.

The tree on the left-hand side always displays the respective default settings for the graphs, but it also allows you to change the display. If you double-click on the text ‘Function’ (green arrow), a window appears for visual adjustment of the graph.

If you wish to hide the graph temporarily, simply click on the coloured icon (green arrow). Clicking again will make the graph visible once more.

The appearance of the background, the axes and the displayed text can also be easily customised. To do this, simply double-click on one of the text items in the tree; a dialogue box will then appear offering the relevant options (red arrow),

You can have further graphs drawn in the same window by selecting one of the graph functions on the left-hand side (red arrow). This adds another tab with default values for the new graph. It is then displayed in the same Graph tab.

If you would prefer to display the graph in a new, separate window, click instead on the top icon New Graph (green arrow). The CGRAPH start screen will then open again, and you will have access to all graphing functions. These will then always be displayed in a new graph window.

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