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A graph of a real function can be drawn in two dimensions because there are two represented variables, and .However, complex numbers are represented by two variables and therefore two dimensions; this means that representing a complex function (more precisely, a complex-valued function of one complex variable:) requires the visualization of four dimensions.
A graphing calculator is a class of hand-held calculator that is capable of plotting graphs and solving complex functions. There are several companies that manufacture models of graphing calculators. Texas Instruments is a major manufacturer.
A graphing calculator ... calculators can be programmed to automate complex and frequently used series of ... string, bit-manipulation, number base, I/O, and graphics ...
Qalculate! supports common mathematical functions and operations, multiple bases, autocompletion, complex numbers, infinite numbers, arrays and matrices, variables, mathematical and physical constants, user-defined functions, symbolic derivation and integration, solving of equations involving unknowns, uncertainty propagation using interval arithmetic, plotting using Gnuplot, unit and currency ...
Like many Casio calculators, the FX-7000G includes a programming mode, [3] in addition to its display and graphing mode. It holds 422 bytes of programming memory, [6] less than half a kilobyte. However the calculator does allow for expanded/additional memory by a method of reducing the number of steps within a program.
The calculator also handles vectors, matrices and complex numbers better than the TI-83. One drawback, however, is that the statistics package on the TI-83 range doesn't come preloaded on the TI-86. However, it can be downloaded from the Texas Instruments program archive and installed on the calculator using the link cable. [1]