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- ; Graphic demo of Gibbs phenomenon.
- ; Fourier series convergence is slowest near discontinuities.
-
- ; the function
- f(x) := SUM(SIN((2n+1)x)/(2n+1),n,0,20)*4/PI
-
- ; the domain for the plot
- GBOUNDS 0, PI
- PLOT f
-
- ; Some commands which make the plot look nicer.
- GSTYLE 1
- GPOINTS 100
- TITLE "Gibbs phenomenon"
- SUBTITLE "for the square wave"
- YLABEL "20 Fourier terms"