Have you every got the feeling, when you are taking ordinary differential equations, and they ask you to use technology to graph the direction field for some differential equation ? Did you ever wish that your graphing calculator could be that "technology"? That is how I felt, and after numerous versions I have made a beautiful and simplistic direction field program in python, designed for a TI 84 plus CE with the python app.

Here are the pros and cons of the python program:
Pros:

• Thin lines make slopes easy to estimate
• Features colored lines (negative slopes= blue, positive slopes = red)
• Will trace the approximate solution from a point with a custom step interval

Cons:

• You need to update the function in the code itself

To use the program you need to first specify the function in the commented section of the code. When you run it it will ask you for the dimensions of the screen you want to graph and for the spacing of the lines. Then the program will prompt you too trace approximate solution. If you enter 0 (no), it will draw the direction field. If you enter 1 (yes) it will draw the direction field AND the traced line.

installation instructions