Graphing & List Window
Graphing and list manipulation is performed in a separate tool window, as shown below. Press F12 at any time to show or hide (toggle) the Graphing & List Window. Alternatively, you may select View->Graphing & Lists from the calculator's main menu.
DreamCalc Graphing & List Window (Professional Edition also shows Cashflow List)
Note: In the Graphing & Professional Editions, the window provides a two page interface with Graphing Display and List Data page tabs. In the Scientific Edition of DreamCalc, only the List Data page is available. The Professional Edition offers an additional Cashflow List for use in financial calculations.
List Data & Statistical Modes
DreamCalc maintains two independent data lists for use in statistical calculations and data plots, namely an X-Y list and Standard Data (weighted frequency) list. The list page allows you to edit data just as you would in a spreadsheet.
Only one list is shown at any time, depending on the calculator's statistical mode. You can switch statistical mode instantly from either the Mode menu on the Graphing & List Window or the Mode menu on the main calculator interface.
Placing DreamCalc into any one of the X-Y regression modes displays the X-Y Data List, while selecting the Standard Data mode shows the SD Data List.
Sorting, Pruning & Consolidating Frequencies
From the Edit menu, you can insert and remove list rows, and sort data according to the selected column. The Prune menu option simply removes empty cells, or cells containing invalid data. If you are working with the SD list, the Consolidate Frequencies option will sort the list and combine any cells which share the same value by adding their frequencies.
Changing Chart Views
You can change chart views, without loss of data, from the Chart menu option. For example, selecting Chart->Function Grapher will show the function graphing view as displayed in the screen-shot above. You may also select from a range of available list data charts. The chart range available will depend on the current statistical mode, and charts not applicable to the current mode will be grayed out.
For example, to display a histogram, click:
Chart->Histogram
If the option is grayed out, first select the Standard Data (SD) option from the Mode menu to put the calculator into the SD mode.
X-Y Data Charts
You may plot X-Y data using any of the X-Y regression modes, and display an optional line of best-fit, as calculated for the selected regression style. X-Y data plots can be shown as a line, scatter points or X-Y bar chart, as selected from the Chart menu.
The plot below shows a Scatter Plot with a cubic regression line of best fit.
X-Y Plot with Cubic Regression
Use the Show Regression Fit option under the Chart menu to toggle the line of best-fit display on or off. In addition, X-Y plots may be displayed with logarithmic axes, or presented in parametric space. See the Axes Menu Options section, below, for more information.
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