iGraphmatica vs VHDL Ref Usage & Stats

Graphmatica is a powerful, easy-to-use, equation plotter with numerical and calculus features: - Graph Cartesian functions, relations, and inequalities, plus polar, parametric, and ordinary differential equations. - Data plotting and curve-fitting. - Up to 999 graphs on screen at once. - Numerically solve and graphically display tangent lines and integrals. - Find critical points, solutions to equations, and intersections between Cartesian functions. - AutoSquare keeps your graphs from getting squashed as you zoom or enable helper panes; or disable it in General Settings so you can scale each axis independently by pinching horizontally or vertically. - Print your graphs, copy to clipboard or export to Photo Album. - Share graph documents with friends or Graphmatica for Mac or Windows via email or iTunes. - Online help and demo files make getting up to speed a snap. In summary, a great tool for students and teachers of anything from high-school algebra through college calculus.

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VHDL Ref

A quick reference manual for the two most popular Hardware Description Languages (HDL): VHDL and Verilog. This app is written by engineers, for engineers. For every construct in VHDL, provides the equivalent in Verilog, and vice-versa. Experienced custom digital logic designer for FPGA or ASIC? Electrical engineering student just learning the ropes? This app is for you. + Searchable dictionary of every keyword, operator, and data type for both languages. + Handbook provides simple example for every single reference + Common functions in each language + All pre-defined attributes for VHDL + All primitive gates and drive strengths for Verilog + Filter by language (VHDL, Verilog, or both) + Filter by language elements (keywords, operators, attributes, data types, etc.)