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- cplxview - module to visualize the graphs of complex
- functions.
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- Purpose: to allow the user to examine complex functions.
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- Features: functions typed into the function panel are
- interpreted via a fexpr, a fast expression evaluator written
- at the Geometry Center. The domain of the function may be
- specified in a variety of ways, including user defined
- coordinates. Since the graphs of complex functions live in
- C^2, this viewer makes use of the n-dimensional viewing
- capabilities of geomview (see ndview).
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- What you see at start-up: the graph of the complex
- exponential function, seen from four vantage points. At the
- top of the windows, there is a label similar to
- "cluster1:1_2_4". The last three numbers correspond to the
- directions visible in the window. In this case, 1_2_4
- corresponds to the real part of z, the imaginary part of z,
- and the imaginary part of the function of z. The color
- corresponds to the dimension that has been projected out, in
- this example the real part of the function of z.
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- How-to-use-it: This section will describe the meaning
- or use of the buttons and inputs, organized by what is shown
- on the main panel.
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- Function: please type the function you would like to graph
- in this input. The parser understands parenthesis, standard
- functions like sin and log, and various constants, namely i,
- e, and pi. To get exponentials, use the power ("pow")
- function, as in "pow(2,z)". When you are done typing in the
- new function, hit return. If the parser understands what
- you wrote, you will see a message saying "new function
- installed" in the message window.
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- Domain: this part of the panel determined the domain over
- which the function is to be graphed. The meaning of each of
- the four numbers is displayed to its left, which changes if
- you change the coordinate system. Use the arrows to modify
- these numbers. If you would like more or less precise
- control than that afforded in this system, you might
- incorporate your wishes into the function you are graphing.
- For example, if you wish to graph f(z) = log(z) very near
- the origin, you may instead wish to use f(z) = log(z/1000).
- When modifying the domain, advanced users may wish to turn
- off normalization in geomview.
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- Range: pressing this button will give you the range panel,
- on which you can specify that you wish to see the (three
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- Page 1 (printed 12/22/98)
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- dimensional) graph of the real part of the function, the
- (three dimensional) graph of the imaginary part of the
- function, or the actual four-dimensional graph, as viewer
- through the n-dimensional viewer.
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- Meshsize: you can modify how fine the mesh used to show the
- function is. Note that this is a regular mesh, which
- doesn't try to avoid singularities. Note also that the
- fineness of the mesh (along with the domain) is remembered
- as you change coordinate systems.
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- Coordtype: this button brings up the panel for specifying
- the coordinate system you wish to use for determining the
- domain to be graphed. There are three choices: rectangular,
- polar, and user-defined coordinates. The user-defined
- coordinates mean that z is defined in terms s and t, which
- are in turn functions of u and v. The same parsing
- mechanism is applied to these functions as to the function
- to be graphed. At the right on the coordtype panel is the
- explanation of what z is assigned to. Advanced users may
- use all the symbols listed there (x, y, r, theta, s, and t)
- in the main function window but are advised that there may
- be unexpected consequences if they are used in the "wrong"
- coordinate system context.
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- Sliders: users may also make use of two constants "a" and
- "b" which are attached to sliders, if they so desire. These
- constants can be inserted into a function just as one might
- expect, for example, one could have a function "a*sin(z+b)",
- or "pow(z,a+i*b)". The default setting of the user defined
- coordinates uses these sliders to determine a rectangular
- domain whose size depends on the slider values.
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- Help: the help button calls up this panel. More
- information can be found in the manual pages, and comments
- are appreciated.
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- AAAAUUUUTTTTHHHHOOOORRRRSSSS
- Olaf Holt and Nils McCarthy
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- Page 2 (printed 12/22/98)
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