I use matlab... don't get me wrong, its nice for data input, but when you want to plot complex functions or easily calculate integrals with symbols instead of numbers, mathematica is where its at. Plus its very visual. I like that.
so you were googling wiener, when you came across the wikipedia article. you know, you can just do a picture search... should help you find your wieners quicker. no need to thank me, i'm just glad i can help.