Posts: 135

Threads: 11

Joined: Jan 1970

Your 48G is abysmally slow for drawing direction fields for difeq plots, and they often do not resemble what the plot should look like. The TI89, which does a great job of slope field plots, beats the heck out of HP, and is another example of how TI has been able to lock up 99% of educational calculator sales.

A quick way around this would be to plug in numbers into the equation at selected intervals to directly compute the slope. This is what us old folks did before graphing calculators came along.

Hopefully your school will some sort of computer algebra system available, such as Maple. These programs can quickly and accurately plot these and other more difficult graphs to help you visualize the math.

*Edited: 5 Oct 2005, 9:42 a.m. *