Fourier Series Grapher

Here's a simple JavaScript + HTML program I wrote. It will graph a given number of terms of a Fourier series. To graph a Fourier series, type the appropriate expressions into the text fields and click "Update." The text fields support JavaScript, so you can write a whole function in there if you need to.

I also added some functions.

1. even(x) - returns true if x is even, false otherwise.
2. odd(x) - returns true if x is odd, false otherwise.
3. power(x, a) - returns x^a.

Some examples of input to try:

• odd(k)?(2/k):0
• even(k)?(4/k/PI):0
• odd(k)?(4/(k+PI)/k):0

The default Fourier series is equal to sin(2.5x) on (-π, π).

Enjoy!




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