When I hear the phrase “symbolic programming”, LISP, Prolog and (yes) Mathematica immediately leap to mind. I would characterize a symbolic programming environment as one in which the expressions used to represent program text also happen to be the primary data structure. As a result, it becomes very easy to build abstractions upon abstractions since … Read more
One of the nice things about the Mathematica notebook interface is that it can evaluate expressions in any language, not just Mathematica. As a simple example, consider creating a new Shell input cell type that passes the contained expression to the operating system shell for evaluation. First, define a function that delegates evaluation of a … Read more
As far as I see, the problem is (as you already wrote), that MeanResidualLife takes a long time to compute, even for a single evaluation. Now, the FindMinimum or similar functions try to find a minimum to the function. Finding a minimum requires either to set the first derivative of the function zero and solve … Read more
I’ve found Waldo! How I’ve done it First, I’m filtering out all colours that aren’t red waldo = Import[“http://www.findwaldo.com/fankit/graphics/IntlManOfLiterature/Scenes/DepartmentStore.jpg”]; red = Fold[ImageSubtract, #[[1]], Rest[#]] &@ColorSeparate[waldo]; Next, I’m calculating the correlation of this image with a simple black and white pattern to find the red and white transitions in the shirt. corr = ImageCorrelate[red, Image@Join[ConstantArray[1, {2, … Read more