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A neat program I find myself using to type up notes with inline calculations is Calca. It has versions for Mac OS X, iOS, and Windows. You can define functions, lookup values inline, and mix units. It also supports modularity and namespaces (via headers). Vectors and matrix math, complex numbers, and even formatting with Markdown. All-in-all, it's pretty ...


Why do I get an empty plot? Often new Mathematica users (and some not-so-new users) post questions asking why their plot of some expression just shows axes, with no plotted curve appearing. The key thing to keep in mind is that this will almost never have to do with the Plot command itself. It invariably occurs because the expression is not evaluating to a ...

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