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fimplicit3

Plot 3-D implicit function

Syntax

fimplicit3(f)
fimplicit3(f,interval)
fimplicit3(ax,___)
fimplicit3(___,LineSpec)
fimplicit3(___,Name,Value)
fs = fimplicit3(___)

Description

example

fimplicit3(f) plots the 3-D implicit function defined by f(x,y,z) = 0 over the default interval [-5 5] for x, y, and z.

example

fimplicit3(f,interval) specifies the plotting interval for x, y, and z.

fimplicit3(ax,___) plots into the axes specified by ax instead of into the current axes. Specify the axes as the first input argument, prior to any of the previous input arguments.

fimplicit3(___,LineSpec) specifies the line style, marker symbol, and line color. For example, '-r' specifies red lines.

example

fimplicit3(___,Name,Value) specifies surface properties using one or more name-value pair arguments. For example, 'FaceAlpha',0.6 specifies a transparency value of 0.6 for a semi-transparent surface.

example

fs = fimplicit3(___) returns the ImplicitFunctionSurface object. Use fs to access and modify properties of the surface after it is created. For a list of properties, see ImplicitFunctionSurface Properties.

Examples

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Plot the hyperboloid over the default interval of for x, y, and z.

f = @(x,y,z) x.^2 + y.^2 - z.^2;
fimplicit3(f)

Plot the upper half of the hyperboloid by specifying the plotting interval as [0 5] for z. For x and y, use the default interval [-5 5].

f = @(x,y,z) x.^2 + y.^2 - z.^2;
interval = [-5 5 -5 5 0 5];
fimplicit3(f,interval)

Plot the implicit surface . Remove the lines by setting the EdgeColor property to 'none'. Add transparency by setting the FaceAlpha property to a value between 0 and 1.

f = @(x,y,z) x.^2 + y.^2 - z.^2;
fimplicit3(f,'EdgeColor','none','FaceAlpha',.5)

Plot an implicit surface and assign the implicit surface object to the variable fs.

f = @(x,y,z) 1/x.^2 - 1/y.^2 + 1/z.^2;
fs = fimplicit3(f)
fs = 
  ImplicitFunctionSurface with properties:

     Function: @(x,y,z)1/x.^2-1/y.^2+1/z.^2
    EdgeColor: [0 0 0]
    LineStyle: '-'
    FaceColor: 'interp'

  Show all properties

Use fs to access and modify properties of the implicit surface after it is created. For example, show only the positive x values by setting the XRange property to [0 5]. Remove the lines by setting the EdgeColor property to 'none'. Add transparency by setting the FaceAlpha property to 0.8.

fs.XRange = [0 5];
fs.EdgeColor = 'none';
fs.FaceAlpha = 0.8;

Input Arguments

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3-D implicit function to plot, specified as a function handle to a named or anonymous function.

Specify a function of the form w = f(x,y,z). The function must accept three 3-D array input arguments and return a 3-D array output argument of the same size. Use array operators instead of matrix operators for the best performance. For example, use .* (times) instead of * (mtimes).

Example: fimplicit3(@(x,y,z) x.^2 + y.^2 - z.^2)

Plotting interval for x, y, and z, specified in one of these forms:

  • Two-element vector of form [min max] — Use the same plotting interval of [min max] for x, y, and z.

  • Six-element vector of form [xmin xmax ymin ymax zmin zmax] — Use different plotting intervals for x, y, and z. Plot over the interval [xmin xmax] for x, over [ymin ymax] for y, and over [zmin zmax] for z.

Example: fimplicit3(f,[-2 3 -4 5 -3 3])

Line style, marker symbol, and color, specified as a character vector or string containing symbols. The symbols can appear in any order. You do not need to specify all three characteristics (line style, marker symbol, and color). For example, if you omit the line style and specify the marker, then the plot shows only the markers and no line.

Example: fimplicit3(f,'--or') plots a red, dashed line with circle markers.

Line StyleDescription
-Solid line (default)
--Dashed line
:Dotted line
-.Dash-dot line
MarkerDescription
oCircle
+Plus sign
*Asterisk
.Point
xCross
sSquare
dDiamond
^Upward-pointing triangle
vDownward-pointing triangle
>Right-pointing triangle
<Left-pointing triangle
pPentagram
hHexagram
ColorDescription

y

yellow

m

magenta

c

cyan

r

red

g

green

b

blue

w

white

k

black

Axes object. If you do not specify the axes, then fimplicit3 uses the current axes.

Name-Value Pair Arguments

Specify optional comma-separated pairs of Name,Value arguments. Name is the argument name and Value is the corresponding value. Name must appear inside single quotes (' '). You can specify several name and value pair arguments in any order as Name1,Value1,...,NameN,ValueN.

Example: fimplicit3(f,'MeshDensity',50,'FaceAlpha',0.5) specifies the number of evaluation points and a transparency value.

The ImplicitFunctionSurface properties listed here are only a subset. For a complete list, see ImplicitFunctionSurface Properties.

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Number of evaluation points per direction, specified as a scalar.

Face transparency, specified as a scalar in the range [0,1]. Use uniform transparency across all of the faces. A value of 1 is fully opaque and 0 is completely transparent. Values between 0 and 1 are semitransparent.

Face color, specified as 'interp', an RGB triplet, or one of the color options listed in the table. The default value of 'interp' interpolates the colors based on the ZData values.

For a custom color, specify an RGB triplet. An RGB triplet is a three-element row vector whose elements specify the intensities of the red, green, and blue components of the color. The intensities must be in the range [0,1]; for example, [0.4 0.6 0.7]. Alternatively, you can specify some common colors by name. This table lists the long and short color name options and the equivalent RGB triplet values.

OptionDescriptionEquivalent RGB Triplet
'red' or 'r'Red[1 0 0]
'green' or 'g'Green[0 1 0]
'blue' or 'b'Blue[0 0 1]
'yellow' or 'y'Yellow[1 1 0]
'magenta' or 'm'Magenta[1 0 1]
'cyan' or 'c'Cyan[0 1 1]
'white' or 'w'White[1 1 1]
'black' or 'k'Black[0 0 0]
'none'No colorNot applicable

Line color, specified as 'interp', an RGB triplet, or one of the color options listed in the table. The default RGB triplet value of [0 0 0] corresponds to black. The 'interp' value colors the edges based on the ZData values.

For a custom color, specify an RGB triplet. An RGB triplet is a three-element row vector whose elements specify the intensities of the red, green, and blue components of the color. The intensities must be in the range [0,1]; for example, [0.4 0.6 0.7]. Alternatively, you can specify some common colors by name. This table lists the long and short color name options and the equivalent RGB triplet values.

OptionDescriptionEquivalent RGB Triplet
'red' or 'r'Red[1 0 0]
'green' or 'g'Green[0 1 0]
'blue' or 'b'Blue[0 0 1]
'yellow' or 'y'Yellow[1 1 0]
'magenta' or 'm'Magenta[1 0 1]
'cyan' or 'c'Cyan[0 1 1]
'white' or 'w'White[1 1 1]
'black' or 'k'Black[0 0 0]
'none'No colorNot applicable

Line style, specified as one of the line styles listed in this table.

Line StyleDescriptionResulting Line
'-'Solid line

'--'Dashed line

':'Dotted line

'-.'Dash-dotted line

'none'No lineNo line

Line width, specified as a positive value in points. If the line has markers, then the line width also affects the marker edges.

Example: 0.75

Tips

  • Use element-wise operators for the best performance and to avoid a warning message. For example, use x.*y instead of x*y. For more information, see Array vs. Matrix Operations.

  • When you zoom in on the chart, fimplicit3 recalculates the data, which can reveal hidden details.

Introduced in R2016b

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