Plotting Program Wesley B. Loewer loewer@largo.star.harc.edu Functions - Plots functions in Cartesian, Polar, or Parametric form. Functions may be entered in either Algebraic or RPN (Reverse Polish Notation, also called post-fix notation) modes. Allows grids, logarithmic scales, up to 10 user defined variables, separate control over viewing window and domain, and a library of over 75 built in operators, functions, and constants. Conic Sections - Plots parabolas, circles, ellipses, hyperbolas and their degenerate shapes. Equations may be entered in standard or general form. Also shows focal points, asymptotes, and directrix. Derivatives & Integrals - Plots functions along with its indefinite integral and its 1st and 2nd derivatives. Relation Plotter - A somewhat slow but extremely powerful plotter for graphing relations that are not necessarily functions, such as "y=abs(x)^sin(y)." It can also graph a system of inequalities, such as "y < 0.5x and x > 1 and x*y < 2." It is also good for those situations where it is just too difficult or even impossible to solve for either x or y, such as "x^2+x^3*y^3-1-y=0." Bifurcations - A bifurcation fractal plotter. Demonstrates concepts such as Chaos and period doubling. For example, try the population equation r*p*(1-p) with initial value=0.5, x min=1, x max=4, y min=0, y max=1, with r as the independent variable and p as the dependent. Recursive Relations - Plots recursive relations. Allows a user to describe a relation in a such a manner where both the horizontal and vertical component values can depend on previous values of each other. This can be very useful in determining the attractors in certain fractals, such as the Henon Map and the "orbits" involved in calculating such things as the Mandelbrot Set. Curve Fitting - Fits a line or curve to a set of data points. Uses linear, logarithmic, exponential, power, and up to 9th degree polynomial models. (modified from the documentation) Download wlplt259.zip [287 KB].