fmesh

Description

example

fmesh(f) creates a mesh plot of the expression z = f(x,y) over the default interval [-5 5] for x and y.

example

fmesh(f,xyinterval) plots over the specified interval. To use the same interval for both x and y, specify xyinterval as a two-element vector of the form [min max]. To use different intervals, specify a four-element vector of the form [xmin xmax ymin ymax].

example

fmesh(funx,funy,funz) plots the parametric mesh defined by x = funx(u,v), y = funy(u,v), z = funz(u,v) over the default interval [-5 5] for u and v.

fmesh(funx,funy,funz,uvinterval) plots the parametric mesh over the specified interval. To use the same interval for both u and v, specify uvinterval as a two-element vector of the form [min max]. To use different intervals, specify a four-element vector of the form [umin umax vmin vmax].

fmesh(___,LineSpec) sets the line style, marker symbol, and color of the mesh. For example, '-r' specifies red lines. Use this option after any of the previous input argument combinations.

example

fmesh(___,Name,Value) specifies properties of the mesh using one or more name-value pair arguments. Use this option with any of the input argument combinations in the previous syntaxes.

fmesh(ax,___) plots into the axes specified by ax instead of the current axes gca.

fs = fmesh(___) returns a FunctionSurface object or a ParameterizedFunctionSurface object, depending on the inputs. Use fs to query and modify properties of a specific surface. For a list of properties, see FunctionSurface Properties or ParameterizedFunctionSurface Properties.

Examples

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Plot a mesh of the input $\mathrm{sin}\left(x\right)+\mathrm{cos}\left(y\right)$ over the default interval $-5 and $-5.

fmesh(@(x,y) sin(x)+cos(y))

Plot the parameterized mesh

$\begin{array}{c}x=r\mathrm{cos}\left(s\right)\mathrm{sin}\left(t\right)\\ y=r\mathrm{sin}\left(s\right)\mathrm{sin}\left(t\right)\\ z=r\mathrm{cos}\left(t\right)\\ where\phantom{\rule{1em}{0ex}}r=2+\mathrm{sin}\left(7s+5t\right)\end{array}$

for $0 and $0. Make the mesh partially transparent using alpha.

r = @(s,t) 2 + sin(7.*s + 5.*t);
x = @(s,t) r(s,t).*cos(s).*sin(t);
y = @(s,t) r(s,t).*sin(s).*sin(t);
z = @(s,t) r(s,t).*cos(t);
fmesh(x,y,z,[0 2*pi 0 pi])
alpha(0.8)

Plot the piecewise input

$\begin{array}{cc}erf\left(x\right)+\mathrm{cos}\left(y\right)& -5

over the interval $-5

Specify the plotting interval as the second argument of fmesh. When you plot multiple inputs over different intervals in the same axes, the axis limits adjust to include all the data.

fmesh(@(x,y) erf(x)+cos(y),[-5 0 -5 5])
hold on
fmesh(@(x,y) sin(x)+cos(y),[0 5 -5 5])
hold off

Create a mesh plot using red lines.

fmesh(@(x,y) sin(x)+cos(y),'EdgeColor','red')

Input Arguments

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

Specify a function of the form z = f(x,y). The function must accept two matrix input arguments and return a matrix 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: f = @(x,y) sin(x) + cos(y);

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

• Vector of form [min max] — Use the interval [min max] for both x and y

• Vector of form [xmin xmax ymin ymax] — Use the interval [xmin xmax] for x and [ymin ymax] for y.

Parametric function for x coordinates, specified as a function handle to a named or anonymous function.

Specify a function of the form x = funx(u,v). The function must accept two matrix input arguments and return a matrix 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: funx = @(u,v) u.*sin(v);

Parametric function for y coordinates, specified as a function handle to a named or anonymous function.

Specify a function of the form y = funy(u,v). The function must accept two matrix input arguments and return a matrix 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: funy = @(t) @(u,v) -u.*cos(v);

Parametric function for z coordinates, specified as a function handle to a named or anonymous function.

Specify a function of the form z = funz(u,v). The function must accept two matrix input arguments and return a matrix 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: funz = @(u,v) v;

Plotting interval for u and v, specified in one of these forms:

• Vector of form [min max] — Use the interval [min max] for both u and v.

• Vector of form [umin umax vmin vmax] — Use the interval [umin umax] for u and [vmin vmax] for v.

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

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

Example: "--or" is a red dashed line with circle markers

Line StyleDescriptionResulting Line
"-"Solid line

"--"Dashed line

":"Dotted line

"-."Dash-dotted line

MarkerDescriptionResulting Marker
"o"Circle

"+"Plus sign

"*"Asterisk

"."Point

"x"Cross

"_"Horizontal line

"|"Vertical line

"square"Square

"diamond"Diamond

"^"Upward-pointing triangle

"v"Downward-pointing triangle

">"Right-pointing triangle

"<"Left-pointing triangle

"pentagram"Pentagram

"hexagram"Hexagram

Color NameShort NameRGB TripletAppearance
"red""r"[1 0 0]

"green""g"[0 1 0]

"blue""b"[0 0 1]

"cyan" "c"[0 1 1]

"magenta""m"[1 0 1]

"yellow""y"[1 1 0]

"black""k"[0 0 0]

"white""w"[1 1 1]

Name-Value Arguments

Specify optional pairs of arguments as Name1=Value1,...,NameN=ValueN, where Name is the argument name and Value is the corresponding value. Name-value arguments must appear after other arguments, but the order of the pairs does not matter.

Before R2021a, use commas to separate each name and value, and enclose Name in quotes.

Example: 'Marker','o','MarkerFaceColor','red'

The properties listed here are only a subset. For a full list, see FunctionSurface Properties.

Number of evaluation points per direction, specified as a number. The default is 35. Because fmesh objects use adaptive evaluation, the actual number of evaluation points is greater.

Example: 100

Display contour plot under plot, specified as 'on' or 'off', or as numeric or logical 1 (true) or 0 (false). A value of 'on' is equivalent to true, and 'off' is equivalent to false. Thus, you can use the value of this property as a logical value. The value is stored as an on/off logical value of type matlab.lang.OnOffSwitchState.

Line color, specified as 'interp', an RGB triplet, a hexadecimal color code, a color name, or a short name. The default value of 'interp' colors the edges based on the ZData property values.

For a custom color, specify an RGB triplet or a hexadecimal color code.

• 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].

• A hexadecimal color code is a character vector or a string scalar that starts with a hash symbol (#) followed by three or six hexadecimal digits, which can range from 0 to F. The values are not case sensitive. Therefore, the color codes "#FF8800", "#ff8800", "#F80", and "#f80" are equivalent.

Alternatively, you can specify some common colors by name. This table lists the named color options, the equivalent RGB triplets, and hexadecimal color codes.

Color NameShort NameRGB TripletHexadecimal Color CodeAppearance
"red""r"[1 0 0]"#FF0000"

"green""g"[0 1 0]"#00FF00"

"blue""b"[0 0 1]"#0000FF"

"cyan" "c"[0 1 1]"#00FFFF"

"magenta""m"[1 0 1]"#FF00FF"

"yellow""y"[1 1 0]"#FFFF00"

"black""k"[0 0 0]"#000000"

"white""w"[1 1 1]"#FFFFFF"

"none"Not applicableNot applicableNot applicableNo color

Here are the RGB triplets and hexadecimal color codes for the default colors MATLAB® uses in many types of plots.

RGB TripletHexadecimal Color CodeAppearance
[0 0.4470 0.7410]"#0072BD"

[0.8500 0.3250 0.0980]"#D95319"

[0.9290 0.6940 0.1250]"#EDB120"

[0.4940 0.1840 0.5560]"#7E2F8E"

[0.4660 0.6740 0.1880]"#77AC30"

[0.3010 0.7450 0.9330]"#4DBEEE"

[0.6350 0.0780 0.1840]"#A2142F"

Example: 'blue'

Example: [0 0 1]

Example: '#0000FF'

Line style, specified as one of the options 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, where 1 point = 1/72 of an inch. If the line has markers, then the line width also affects the marker edges.

The line width cannot be thinner than the width of a pixel. If you set the line width to a value that is less than the width of a pixel on your system, the line displays as one pixel wide.

Marker symbol, specified as one of the values listed in this table. By default, the object does not display markers. Specifying a marker symbol adds markers at each data point or vertex.

MarkerDescriptionResulting Marker
"o"Circle

"+"Plus sign

"*"Asterisk

"."Point

"x"Cross

"_"Horizontal line

"|"Vertical line

"square"Square

"diamond"Diamond

"^"Upward-pointing triangle

"v"Downward-pointing triangle

">"Right-pointing triangle

"<"Left-pointing triangle

"pentagram"Pentagram

"hexagram"Hexagram

"none"No markersNot applicable

Marker outline color, specified as 'auto', an RGB triplet, a hexadecimal color code, a color name, or a short name. The default value of 'auto' uses the same color as the EdgeColor property.

For a custom color, specify an RGB triplet or a hexadecimal color code.

• 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].

• A hexadecimal color code is a character vector or a string scalar that starts with a hash symbol (#) followed by three or six hexadecimal digits, which can range from 0 to F. The values are not case sensitive. Therefore, the color codes "#FF8800", "#ff8800", "#F80", and "#f80" are equivalent.

Alternatively, you can specify some common colors by name. This table lists the named color options, the equivalent RGB triplets, and hexadecimal color codes.

Color NameShort NameRGB TripletHexadecimal Color CodeAppearance
"red""r"[1 0 0]"#FF0000"

"green""g"[0 1 0]"#00FF00"

"blue""b"[0 0 1]"#0000FF"

"cyan" "c"[0 1 1]"#00FFFF"

"magenta""m"[1 0 1]"#FF00FF"

"yellow""y"[1 1 0]"#FFFF00"

"black""k"[0 0 0]"#000000"

"white""w"[1 1 1]"#FFFFFF"

"none"Not applicableNot applicableNot applicableNo color

Here are the RGB triplets and hexadecimal color codes for the default colors MATLAB uses in many types of plots.

RGB TripletHexadecimal Color CodeAppearance
[0 0.4470 0.7410]"#0072BD"

[0.8500 0.3250 0.0980]"#D95319"

[0.9290 0.6940 0.1250]"#EDB120"

[0.4940 0.1840 0.5560]"#7E2F8E"

[0.4660 0.6740 0.1880]"#77AC30"

[0.3010 0.7450 0.9330]"#4DBEEE"

[0.6350 0.0780 0.1840]"#A2142F"

Example: [0.5 0.5 0.5]

Example: 'blue'

Example: '#D2F9A7'

Marker fill color, specified as 'auto', an RGB triplet, a hexadecimal color code, a color name, or a short name. The 'auto' value uses the same color as the MarkerEdgeColor property.

For a custom color, specify an RGB triplet or a hexadecimal color code.

• 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].

• A hexadecimal color code is a character vector or a string scalar that starts with a hash symbol (#) followed by three or six hexadecimal digits, which can range from 0 to F. The values are not case sensitive. Therefore, the color codes "#FF8800", "#ff8800", "#F80", and "#f80" are equivalent.

Alternatively, you can specify some common colors by name. This table lists the named color options, the equivalent RGB triplets, and hexadecimal color codes.

Color NameShort NameRGB TripletHexadecimal Color CodeAppearance
"red""r"[1 0 0]"#FF0000"

"green""g"[0 1 0]"#00FF00"

"blue""b"[0 0 1]"#0000FF"

"cyan" "c"[0 1 1]"#00FFFF"

"magenta""m"[1 0 1]"#FF00FF"

"yellow""y"[1 1 0]"#FFFF00"

"black""k"[0 0 0]"#000000"

"white""w"[1 1 1]"#FFFFFF"

"none"Not applicableNot applicableNot applicableNo color

Here are the RGB triplets and hexadecimal color codes for the default colors MATLAB uses in many types of plots.

RGB TripletHexadecimal Color CodeAppearance
[0 0.4470 0.7410]"#0072BD"

[0.8500 0.3250 0.0980]"#D95319"

[0.9290 0.6940 0.1250]"#EDB120"

[0.4940 0.1840 0.5560]"#7E2F8E"

[0.4660 0.6740 0.1880]"#77AC30"

[0.3010 0.7450 0.9330]"#4DBEEE"

[0.6350 0.0780 0.1840]"#A2142F"

Example: [0.3 0.2 0.1]

Example: 'green'

Example: '#D2F9A7'

Marker size, specified as a positive value in points, where 1 point = 1/72 of an inch.

Output Arguments

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One or more FunctionSurface or ParameterizedFunctionSurface objects, returned as a scalar or a vector.

• If you use the fmesh(f) syntax or a variation of this syntax, then fmesh returns FunctionSurface objects.

• If you use the fmesh(funx,funy,funz) syntax or a variation of this syntax, then fmesh returns ParameterizedFunctionSurface objects.

You can use these objects to query and modify properties of a specific mesh. For a list of properties, see FunctionSurface Properties and ParameterizedFunctionSurface Properties.

Version History

Introduced in R2016a