ProCalc - graph 2D

Contents

Overview

The 2D Graph window allows one to draw two-dimensional graphs of functions.

Interface

Graph 2D window exposes following functionality:

Icon Name Description
Add graph… Opens the Add Graph 2D dialog window.
Add parametric graph… Extended version only
Opens the Add Parametric Graph 2D dialog window
Edit graph… Opens the apropriate dialog window to edit selected graph’s properties.
Delete graph Deletes the selected graph.
Proportional zoom Keeps the natural 1:1 proportions of the graph. Disabling this option allows disproportionate zooming.
Zoom to cursor If enabled, the graph area will be zoomed to the mouse cursor position. If disabled, the graph area will be zoomed to its center.

Adding 2D graphs

The 2D graph is a graph of function in the following form:

    \[y = f(x)\]

To add a 2D graph, use the Add 2D graph command. The following dialog window will appear.

ProCalc - add graph 2D

You may enter the chart expression in the expression textbox. Note, that the name x is reserved for function argument. So, if you have previously declared a variable named x, it will not be available in the graph expression. Use another name for the variable instead.

The appearance section allows you to specify a color and graph thickness.

Adding parametric graphs (extended version only)

A parametric 2D graph is a graph of function in the following form:

    \[\left\{\begin{array}{cl} x=f(t)\\ y=g(t)\end{array}\right.\]

To add a 2D graph, use the Add 2D graph command. The following dialog window will appear.

ProCalc - add parametric graph 2D

You may enter the chart function expressions in the apropriate textboxes. Note, that the name t is reserved for functions’ argument. So, if you have previously declared a variable named t, it will not be available in the graph expression. Use another name for the variable instead.

You may specify the bounds of the t argument, as well as quality of the graph. For example, if the range is set to $[0, 1]$ and the number of steps is set to 3, the graph will consist only of three points – evaluated at t values of 0, 0.5 and 1. The optimal point density depends on the graph, but usually value of 100-500 points should be enough.

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