# Attributes of a Data Set

You can edit individual attributes of a data set by selecting the bars or plot line of the desired data set and using the “Edit/Properties” option. Its detail includes:

Representation – defines how the overall dataset is structured. You can choose one of the following data set types:

1 Bar graph – Contains a fixed number of cells. Each new data point changes the nearest cell’s plot. Neighboring cells are NOT connected. The individual bar is centered over the cell, and there is a small gap between bars.

2 Histogram – Also contains a fixed number of cells. Each new data point changes the nearest cell’s bar. There is no connection between neighboring cells. The bar is set at the left edge of the cell, and there is no gap between bars.

3 Discrete surface – Neighboring cells are connected to form a surface, however there is still a fixed number of cells. Each new data point changes the nearest “peak or valley” on the surface.

4 Continuous surface – Variable number of cells, i.e. a new cell is added to the graph each time a data point is plotted at the given (x,y) location. Neighboring cells are connected.

Plot Type – A data set can be shown using a filled region or a simple surface line with or without markers.

1 Fill – Plot a data cell using a filled polygon. The fill style can be reset using the style palette.

2 Line – Plot data cell using a polyline. Use the style palette to reset the line width or dash style.

3 Marker – Use a small marker to represent the data point. The specific marker used for the data point is determined from the “Edit/Mark Style” option. Markers are only valid for the “continuous surface” representation.

Cell Width – For bar, histogram and discrete surface data sets, this is the size of each data cell. For histograms, the first data cell begins at the X axis minimum. For Bar and surface graphs, all cells begin at (X_Minium - Cell_Width / 2) units.

Interpolate – This check box determines whether linear interpolation in forming the connecting surface between consecutive data point. If this option is NOT checked, the surface will be shown with only horizontal and vertical lines.

Use left axis / Use right axis – Your chart can be defined to simultaneously show two sets of independently scaled data by using a second Y axis (generally show to the right of the plot area). Each data set in your chart can belong to either the left or right (second) Y axis.

Static – This option is used to enhance performance whenever you don’t intend the plot to be modified once it has been displayed. In this case, a single polygon (or polyline) will be used to display all cells in the data set.