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The graphical tools menu to the left of the plot allows further formatting, e.g. resizing the whole plot, adding text or drawing, “windowing” in on a smaller region of the plot, etc. Try the tools to see what they do, or consult the manual for further details. 48
49 9.2.3. Curve Fitting KaleidaGraph allows various styles of curve fitting, including linear, polynomial, logarithmic, and exponential. To fit the data in your plot, choose the type of fit you want from the Curve Fit menu. For example, let’s fit the above data with a parabola; i.e. choose “polynomial” fit. A window opens up asking which curve to fit (if you have multiple curves), then which degree of polynomial: choose 2nd degree for a parabola. The result is (also including some cleaning up of axes): 6 sample KG data.txt 5 Position (cm) 4 3 2 1 Y = M0 + M1*x + ... M8*x 8 + M9*x 9 M0 0.25105499017 M1 2.0792304377 M2 2.8269760865 R 0.98539870081 0 0 0.2 0.4 0.6 0.8 1 Time (sec) The box to the right shows the equation of the best-fit line and some curve fit statistics. If it doesn’t appear when you do the fit, choose “Display Equation” from the Plot menu. 9.2.4. Multiple Curves Plotting multiple curves is easy with KaleidaGraph. If your data file has three columns, for example, and you want to plot columns 1 and 2 versus column 0, just choose c1 and c2 as the y-axis in the pop-up window that appears when you choose your plot type. If you want to plot data from different files on the same plot, open all the files simultaneously. Choose the plot type as usual from the Gallery menu. The axis selection window then pops up and notice that the box containing the file name for the top data file looks “3-Dimensional”, as if it has some thickness. This is KaleidaGraph’s way of telling you that there is a pop-up menu under the box: click on it and hold the mouse button down and you will see the names of all the open files. Select each one in turn and choose which columns to put on the x and y axes. When you’re finished click “OK” and the plot will be made. 9.2.5. Formulas To do computations with your data, use the formula window. If you can’t see it, choose “Formula Entry” from the Windows menu. Type the formula you want to use in the window, e.g.: c2 = c0^2 + exp(c1) and click “OK”. Column 2 will be computed and added (or modified if it already exists) to the data window. Check out the “Help” under the Apple menu to get a list of which functions KaleidaGraph knows.
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