# Charting Overview

Significant upgrades to charting are included in the release of Workbench 1.5.0. These upgrades include the new Lines Chart Type and customizable axes.

## Histogram Charts

Histogram charts are available for any data file that contain one or more maps of scalar data and this includes many CIFTI file types, GIFTI metric files, and volume files. A histogram shows the distribution of data within a single map with an option to average the data from all maps. This map contain the same data that is mapped to brainordinates in surface and volume views. To view a histogram chart, change Toolbar->Display mode to Chart and select Histogram in Toolbar->Chart Type. In Toolbox->Chart Layers, enable an overlay using an On checkbox and then choose a file and map for display as a histogram. Multiple histograms are displayed using multiple layers. When displaying more than one histogram, one may want to change the histogram chart from Bars to Envelope by clicking the Layer's wrench button, selecting the Palette tab, and selecting the appropriate check boxes in the Histogram section. There are a variety of additional options for controlling the display of histograms.

## Dyn (Dynamic) Lines Charts

A dynami lines chart shows one data element from each map for a selected brainordinate (identified surface vertex or volume voxel). To display dynamic lines charts from a data-file, one must enable the layer by checking both the On checkbox and the Load checkbox. Note that the Load checkbox is a property of the file so if the same file is in more than one layer, the Load checkbox will maintain the same checked status in these layers. Once loading is enabled for a file, one must identify brainordinates by clicking the mouse on a surface vertex or a volume voxel. Doing so will load the data for the selected brainordinate and display the data as a Dyn Lines chart. A history of lines loaded from a data file is available on in the Dyn Lines section of the Overlay and Map Settings dialog (click the Wrench button in the row containing the layer). One sets the number of chart lines displayed along with editing properties that include the color and thickness of the chart lines.

## Line Charts

Line charts display the content of a file's map or a row from some file types. In the Overlay ToolBox, the top layer displays all data files supporting lines. The remaining layers only list files that are compatible with the top layer. Compatible files are those that use the same data units or contain the same number of elements in their maps.

## Matrix Charts

Matrix charts are available for a limited number of files that contain parcellated connectivity. and for scalar data series files; By default the full matrix is displayed. If the matrix is square (number of rows in the data file matches the number of columns) a button in the Layer controls the display of the matrix as the full matrix or the lower or upper quadrant. Coloring the matrix uses a palette and is identical to that used for display of the file's data in surface and volume overlays.