We have an alternative implementation of the functional graphics package for DrScheme that works around these problems. However, it incurs some disadvantages of its own:
If, having considered this tradeoff, you still consider it worth using
the tool version, read on for a description of how to install the
tool. Please note that once you have installed this tool, you should
not use the fungraph.ss teachpack, since it duplicates the same
functionality. Instead, the only one of our teachpacks you should still
use is the oops.ss teachpack, for the object-oriented
programming system.
One way to install the tool is to go into DrScheme's File menu and select "Install .plt File...". Then enter (or better, paste in) the URL http://www.gustavus.edu/+max/concabs/schemes/drscheme/tools/fungraph/fungraph.plt and click OK. Note that you have to restart DrScheme in order to have the functional graphics tool available for use. From now on, it will be automatically loaded every time you start DrScheme.
Alternatively, you can download the fungraph.plt package from any web browser and then manually run the setup-plt (or "Setup PLT") program (included in the DrScheme distribution) on that package in order to install the tool. (Under Windows, the simplest way to run the Setup PLT program on fungraph.plt after downloading it is simply to double-click the icon for fungraph.plt. Or, your web browser may well offer to "open" fungraph.plt for you; if you accept, that will run Setup PLT on fungraph.plt, installing the tool.)