plot surface of cusp catastrophe (with gnuplot)
问题 Is it possible to plot the surface of the Cusp Catastrophe with Gnuplot? Here's a comparable plot. The catastrophe is mathematically described by: V = x^4 + a*x^2 + b*x (Wikipedia, see above) The surface is describes by: 0 = a + b*y – y^3 I'm a gnu plot beginner, so I'd be really grateful for an example with source code. (I study psychology and I need this plot for an essay about a clinical theory: the cusp catastrophe is used to describe changes of mood, that seem to appear more sudden and