The above picture shows the highly oscillatory function

It was produced by Matlab with the following script

X = linspace(-2,2,1000); Y = ((X-1/4).^3/6 + 1) .* sin(30*X); plot([-2 2], [0 0], ':k', X, Y, 'r'); axis([-2 2 -2 2]); axis off; box off; print -dpng -r50 'hof.png';

The resulting PNG was cropped with `convert -trim hof.png Highly_oscillatory_function.png`