Tabledecimals = # number of decimal places to display in tablesĭefaultdirectory = path Starting directory for Open and Save dialogsĬfmaxorder = # maximum order of polynomial for curve fittingĬfmaxiter = # maximum number of iterations to run curve fitĬopywmf = on or off enable Copy WMF items in Edit menu Tableincr = #.# increment between points in tables Tablecolwidth # = # width of each point tables column in pixels Tablewidth = # width in pixels of point tables window Tablecols = # max number of graphs per table Gridlinewidth = # width in pixels of gridlines (normally 1)ĭrawdots = on or off draw graphs with dots, not lines Widelinewidth = # width in pixels of wide lines (default 2) Widelines = on or off draw graphs with wide lines Ylegpos = center or above y-axis legend position relative to gridlinesĬolor = 1, 2, or mono colorscheme 1, 2, or monochrome Xlegspace = #.# spacing between grid legends Maxeqs = # any integer 1-999: max # of equations keptĪutonum = # any integer 0-maxeqs: how many to redraw Maxannote = # any integer 1-999: max # of annotations Paper = polar, trig, rect, slog, or llog Yaxis = xxxx label for y axis (default is "y") Xaxis = xxxx label for x axis (default is "x") Previously, most English or Western-European Windows systems defaulted to Windows-1252. The structure goes like this: Ĭharset= UTF-8| Windows-1252 must match the encoding of the file other character sets are recognized, but as of version 2.2, files are always written as UTF-8. ini files you can create or modify one with virtually any editor. However, the equation list is just a text file whose structure is virtually identical to Windows-style. Graphmatica does not really provide facilities for maintaining equation lists although you can edit an equation, delete old ones that are no longer needed, and change the order of equations by redrawing selected graphs, determining the precise order of equations in the list is difficult since they are dynamically shuffled each time an equation is entered or redrawn to make Graphmatica more interactive. Math World has an encyclopaedia entry on the topic.Graphmatica Help - Editing Equation Lists The cardioid family of curves is perhaps best known, but they don't have the tapered bottom of the classic valentines heart. In my opinion, though, the cutest one I've found so far is the 'egg in egg' equation, r = t sin t, which really does look like an egg nestled in another egg! There are also a whole lot of equations to draw heart-shaped curves. Simply graph both r = tanh t and r = -tanh t and the two 'tadpoles' which form the picture will fit into each other. So while playing with Graphmatica I found a way to construct the Yin-Yang symbol using only two simple polar equations: it is quite striking to see how the ancients concocted a symbol whose shape is so purely mathematical. The Mactutor History of Mathematics Archive has a webpage featuring famous curves: not Marilyn Monroe or Marlene Dietrich, but more abstract classic beauties like the Hyperbola, Ellipse, and rather more obscure exotics like the Lemniscate of Bernoulli and the Quadratrix of Hippias. One reason why it's so popular is that it's really easy to play around with different equations to produce all sorts of cool shapes. Graphmatica is a freeware mathematical graphing program that's popular in schools for teaching curve sketching and the properties of mathematical curves.
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