What is a Chart?
A chart represents data graphically in different forms (markers, lines, bars, and so on) with scales that are added to indicate the values of the displayed data. We distinguish two kinds of charts:
Cartesian charts represent data in a standard way. The data is expressed using a Cartesian system of coordinates (
x,
y). The
x- and
y-coordinates are plotted along the abscissa and ordinate scales, respectively. The scales are
rectangular and are displayed orthogonally.
A Cartesian Chart
Polar charts represent data in a circular way. The data is expressed using a polar system of coordinates (
θ,
ρ). The abscissa values
θ are plotted along a circular scale. The ordinate scale, along which the
ρ-coordinates are plotted, is
rectangular and is displayed radially.
A Polar Chart
In addition, other elements can be added to a chart to aid in the understanding of the displayed data:
A Grid and a Legend in a Cartesian Chart
Cursors in a Cartesian Chart
Annotations on a Pie Chart
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