SimuLab 13: Measuring the ComputerGenerated Aggregation Pattern
Close the Aggregation Kit program and call up the Fractal Dimension program. Bring up the pattern you saved from the Aggregation Kit and measure its dimension using the box method. If you saved an image from the Straight setting of walker motion, call that up and measure its dimension also.
The Fractal Dimension program offers a second way to measure the dimension of an object, the socalled circle method of HandsOn 2.2. Try out this second measurement method on your computergenerated pattern.
2. Click on the circle icon, second from the left in the toolbar.
The computer counts the number of pixels inside the circle of
that radius. (Pixels are the small dots that form the images on
a computer screen.)
3. Now change the radius of the circle using the size tool at
the top of the window. Click on the circle tool to count the pixels
inside the new circle.
4. Select several more radii and have the computer count pixels
for these circles also.
5. Click on the graph and data tools. You may want to choose additional
values of the radius, so that points are more or less evenly spaced
along the graph. Click on entries in the "# pixels''
column of the table to discard points you do not want included
in the graphical measurement of the slope.
6. You may want to use the circle method to remeasure the dimension
of your saved coastline or the image saved from the electrodeposition
experiment, comparing these measures of dimension to those obtained
using the box method. To do this quickly, click on the fast circle
icon, fourth from the left in the toolbar.



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