Maxima – 76 – Grafici – opzioni di plottaggio – 1

Continuo da qui, copio dal Reference Manual, PDF scaricabile da qui, sono a p.239.

All options consist of a list starting with one of the keywords in this section, followed by one or more values. Some of the options may have different effects in different plotting commands as it will be pointed out in the following list. The options that accept among their possible values true or false, can also be set to true by simply writing their names. For instance, typing logx as an option is equivalent to writing [logx, true].

adapt_depth [adapt depth, integer]
Default value: 5.

The maximum number of splittings used by the adaptive plotting routine.

axes [axes, symbol]
Default value: true.

Where symbol can be either true, false, x, y or solid. If false, no axes are shown; if equal to x or y only the x or y axis will be shown; if it is equal to true, both axes will be shown and solid will show the two axes with a solid line, rather than the default broken line. This option does not have any effect in the 3 dimensional plots.

azimuth [azimuth, number]
Default value: 30.

A plot3d plot can be thought of as starting with the x and y axis in the horizontal and vertical axis, as in plot2d, and the z axis coming out of the screen. The z axis is then rotated around the x axis through an angle equal to elevation and then the new xy plane is rotated around the new z axis through an angle azimuth. This option sets the value for the azimuth, in degrees. See also elevation.

box [box, symbol]
Default value: true.

If set to true, a bounding box will be drawn for the plot; if set to false, no box will be drawn.

color [color, color_1, . . . , color_n]
In 2d plots it defines the color (or colors) for the various curves. In plot3d, it defines the colors used for the mesh lines of the surfaces, when no palette is being used.

If there are more curves or surfaces than colors, the colors will be repeated in sequence.

The valid colors are red, green, blue, magenta, cyan, yellow, orange, violet, brown, gray, black, white, or a string starting with the character # and followed by six hexadecimal digits: two for the red component, two for green component and two for the blue component. If the name of a given color is unknown color, black will be used instead.

color_bar [color bar, symbol]
Default value: false in plot3d, true in mandelbrot and julia.

Where symbol can be either true or false. If true, whenever plot3d, mandelbrot or julia use a palette to represent different values, a box will be shown on the right, showing the corresponding between colors and values.

color_bar_tics [color bar tics, x1, x2, x3]
Defines the values at which a mark and a number will be placed in the color bar. The first number is the initial value, the second the increments and the third is the last value where a mark is placed. The second and third numbers can be omitted. When only one number is given, it will be used as the increment from an initial value that will be chosen automatically.

elevation [elevation, number]
Default value: 60.

A plot3d plot can be thought of as starting with the x and y axis in the horizontal and vertical axis, as in plot2d, and the z axis coming out of the screen. The z axis is then rotated around the x axis through an angle equal to elevation and then the new xy plane is rotated around the new z axis through an angle azimuth. This option sets the value for the azimuth, in degrees. See also azimuth.

grid [grid, integer, integer]
Default value: 30, 30.

Sets the number of grid points to use in the x- and y-directions for three-dimensional plotting or for the julia and mandelbrot programs.

grid2d [grid, value]
Default value: false.

Shows a grid of lines on the xy plane. The points where the grid lines are placed are the same points where tics are marked in the x and y axes, which can be controlled with the xtics and ytics options.

iterations [grid, value]
Default value: 9.

Number of iterations made by the programs mandelbrot and julia.

label [label, [string, x, y], ...]
Writes one or several labels in the points with x, y coordinates indicated after each label.

legend [legend, string_1, ..., string_n]
legend [legend, false].
It specifies the labels for the plots when various plots are shown. If there are more plots than the number of labels given, they will be repeated. If given the value false, no legends will be shown. By default, the names of the expressions or functions will be used, or the words discrete1, discrete2, ..., for discrete sets of points.

logx [logx, value]
Makes the horizontal axes to be scaled logarithmically. It can be either true or false.

logy [logy, value]
Makes the vertical axes to be scaled logarithmically. It can be either true or false.

mesh_lines_color [mesh lines color, color]
Default value: black.

It sets the color used by plot3d to draw the mesh lines, when a palette is being used. It accepts the same colors as for the option color. It can also be given a value false to eliminate completely the mesh lines.

nticks [nticks, integer]
Default value: 29.

When plotting functions with plot2d, it is gives the initial number of points used by the adaptive plotting routine for plotting functions. When plotting parametric functions with plot3d, it sets the number of points that will be shown for the plot.

palette [palette, [palette_1], ..., [palette_n]]
palette [palette, false]
It can consist of one palette or a list of several palettes. Each palette is a list with a keyword followed by values. If the keyword is gradient, it should be followed by a list of valid colors.

If the keyword is hue, saturation or value, it must be followed by 4 numbers. The first three numbers, which must be between 0 and 1, define the hue, saturation and value of a basic color to be assigned to the minimum value of z. The keyword specifies which of the three attributes (hue, saturation or value) will be increased according to the values of z. The last number indicates the increase corresponding to the maximum value of z. That last number can be bigger than 1 or negative; the corresponding values of the modified attribute will be rounded modulo 1.

Gnuplot only uses the first palette in the list; xmaxima will use the palettes in the list sequentially, when several surfaces are plotted together; if the number of palettes is exhausted, they will be repeated sequentially.

The color of the mesh lines will be given by the option mesh_lines_color. If palette is given the value false, the surfaces will not be shaded but represented with a mesh of curves only. In that case, the colors of the lines will be determined by the option color.

plot_format [plot format, format]
Default value: gnuplot, in Windows systems, or gnuplot_pipes in other systems.

Where format is one of the following: gnuplot, xmaxima, mgnuplot, gnuplot_pipes or geomview. It sets the format to be used for plotting.

plot_realpart [plot_realpart, symbol]
Default value: false.

If set to true, the functions to be plotted will be considered as complex functions whose real value should be plotted; this is equivalent to plotting realpart(function). If set to false, nothing will be plotted when the function does not give a real value. For instance, when x is negative, log(x) gives a complex value, with real value equal to log(abs(x)); if plot_realpart were true, log(-5) would be plotted as log(5), while nothing would be plotted if plot_realpart were false.

point_type [point type, type_1, ..., type_n]
In gnuplot, each set of points to be plotted with the style “points” or “linespoints” will be represented with objects taken from this list, in sequential order. If there are more sets of points than objects in this list, they will be repeated sequentially. The possible objects that can be used are: bullet, circle, plus, times, asterisk, box, square, triangle, delta, wedge, nabla, diamond, lozenge.

pdf_file [pdf file, file_name]
Saves the plot into a PDF file with name equal to file_name, rather than showing it in the screen. By default, the file will be created in the directory defined by the variable maxima_tempdir, unless file name contains the character “/”, in which case it will be assumed to contain the complete path where the file should be created. The value of maxima_tempdir can be changed to save the file in a different directory. When the option gnuplot_pdf_term_command is also given, it will be used to set up Gnuplot’s PDF terminal; otherwise, Gnuplot’s pdfcairo terminal will be used with solid colored lines of width 3, plot size of 17.2 cm by 12.9 cm and font of 18 points.

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