fmesh

Plot 3-D mesh

Syntax

fmesh(f)

fmesh(f,[min max])

fmesh(f,[xmin xmax ymin ymax])

fmesh(funx,funy,funz)

fmesh(funx,funy,funz,[uvmin uvmax])

fmesh(funx,funy,funz,[umin umax vmin vmax])

fmesh(___,LineSpec)

fmesh(___,Name,Value)

fmesh(ax,___)

obj = fmesh(___)

Description

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

fmesh(f,[min max]) plots f(x,y) over the interval [min max] for x and y.

fmesh(f,[xmin xmax ymin ymax]) plots f(x,y) over the interval [xmin xmax] for x and [ymin ymax] for y.

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

fmesh(funx,funy,funz,[uvmin uvmax]) plots the parametric mesh x = x(u,v), y = y(u,v), z = z(u,v) over the interval [uvmin uvmax] for u and v.

fmesh(funx,funy,funz,[umin umax vmin vmax]) plots the parametric mesh x = x(u,v), y = y(u,v), z = z(u,v) over the interval [umin umax] for u and [vmin vmax] for v.

fmesh(___,LineSpec) uses the LineSpec to set the line style, marker symbol, and plot color.

fmesh(___,Name,Value) specifies surface properties 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 with the object ax instead of the current axes object gca.

obj = fmesh(___) returns a function surface object or a parameterized function surface object. Use the object to query and modify properties of a specific mesh.

Examples

Additional Examples: See fsurf Page

Note

For additional examples, follow the fsurf page because fmesh and fsurf share the same syntax. All examples on the fsurf page apply to fmesh.

3-D Mesh Plot of Symbolic Expression

Plot a mesh of the input over the default range and .

syms x y
fmesh(sin(x)+cos(y))

3-D Mesh Plot of Symbolic Function

Plot a 3-D mesh of the real part of over the default range and .

syms f(x,y)
f(x,y) = real(atan(x + i*y));
fmesh(f)

Specify Plotting Interval of Mesh Plot

Plot over and by specifying the plotting interval as the second argument of fmesh.

syms x y
f = sin(x) + cos(y);
fmesh(f, [-pi pi -5 5])

Parameterized Mesh Plot

Plot the parameterized mesh

for and . Make the aspect ratio of the axes equal using axis equal. See the entire mesh by making the mesh partially transparent using alpha.

syms s t
r = 8 + sin(7*s + 5*t);
x = r*cos(s)*sin(t);
y = r*sin(s)*sin(t);
z = r*cos(t);
fmesh(x, y, z, [0 2*pi 0 pi], 'Linewidth', 2)
axis equal

alpha(0.8)

Additional Examples: See fsurf Page

Note

For additional examples, follow the fsurf page because fmesh and fsurf share the same syntax. All examples on the fsurf page apply to fmesh.

Input Arguments

f — 3-D expression or function to be plotted

symbolic expression | symbolic function

Expression or function to be plotted, specified as a symbolic expression or function.

[min max] — Plotting interval for x- and y-axes

[–5 5] (default) | vector of two numbers

Plotting interval for x- and y-axes, specified as a vector of two numbers. The default is [-5 5].

[xmin xmax ymin ymax] — Plotting interval for x- and y-axes

[–5 5 –5 5] (default) | vector of four numbers

Plotting interval for x- and y-axes, specified as a vector of four numbers. The default is [-5 5 -5 5].

funx,funy,funz — Parametric functions of u and v

symbolic expressions | symbolic functions

Parametric functions of u and v, specified as a symbolic expression or function.

[uvmin uvmax] — Plotting interval for u and v

[–5 5] (default) | vector of two numbers

Plotting interval for u and v axes, specified as a vector of two numbers. The default is [-5 5].

[umin umax vmin vmax] — Plotting interval for u and v

[–5 5 –5 5] (default) | vector of four numbers

Plotting interval for u and v, specified as a vector of four numbers. The default is [-5 5 -5 5].

ax — Axes object

axes object

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

LineSpec — Line style, marker symbol, and line color

character vector

Line style, marker symbol, and line color, specified as a character vector. The elements of the character vector can appear in any order, and you can omit one or more options from the character vector specifier.

Example: '--or' is a red mesh with circle markers

Specifier	Line Style
-	Solid line (default)
--	Dashed line
:	Dotted line
-.	Dash-dot line

Specifier	Marker
o	Circle
+	Plus sign
*	Asterisk
.	Point
x	Cross
s	Square
d	Diamond
^	Upward-pointing triangle
v	Downward-pointing triangle
>	Right-pointing triangle
<	Left-pointing triangle
p	Pentagram
h	Hexagram

Specifier	Color
y	yellow
m	magenta
c	cyan
r	red
g	green
b	blue
w	white
k	black

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 quotes. You can specify several name and value pair arguments in any order as Name1,Value1,...,NameN,ValueN.

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

'MeshDensity' — Number of evaluation points per direction

35 (default) | number

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

'ShowContours' — Display contour plot under plot

'off' (default) | 'on'

Display contour plot under plot, specified as 'off' (default) or 'on'.

'EdgeColor' — Line color

'interp' (default) | RGB triplet | 'none' | 'r' | 'g' | 'b' | ...

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

Option	Description	Equivalent 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 color	Not applicable

Example: 'blue'

Example: [0 0 1]

'LineStyle' — Line style

'-' (default) | '--' | ':' | '-.' | 'none'

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

Line Style	Description	Resulting Line
'-'	Solid line
'--'	Dashed line
':'	Dotted line
'-.'	Dash-dotted line
'none'	No line	No line

'LineWidth' — Line width

0.5 (default) | positive value

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

'Marker' — Marker symbol

'none' (default) | 'o' | '+' | '*' | '.' | 'x' | 's' | 'd' | ...

Marker symbol, specified as one of the values in this table. By default, a line does not have markers. Add markers at selected points along the line by specifying a marker.

Value	Description
'o'	Circle
'+'	Plus sign
'*'	Asterisk
'.'	Point
'x'	Cross
'square' or 's'	Square
'diamond' or 'd'	Diamond
'^'	Upward-pointing triangle
'v'	Downward-pointing triangle
'>'	Right-pointing triangle
'<'	Left-pointing triangle
'pentagram' or 'p'	Five-pointed star (pentagram)
'hexagram' or 'h'	Six-pointed star (hexagram)
'none'	No markers

'MarkerEdgeColor' — Marker outline color

'auto' (default) | RGB triplet | 'r' | 'g' | 'b' | ...

Marker outline color, specified as 'auto', an RGB triplet, or one of the color options listed in the table. The default value of 'auto' uses the same color as the EdgeColor property.

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.

Option	Description	Equivalent 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 color	Not applicable

Example: [0.5 0.5 0.5]

Example: 'blue'

'MarkerFaceColor' — Marker fill color

'none' (default) | 'auto' | RGB triplet | 'r' | 'g' | 'b' | ...

Marker fill color, specified as 'auto', an RGB triplet, or one of the color options listed in the table. The 'auto' value uses the same color as the MarkerEdgeColor property.

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.

Option	Description	Equivalent 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 color	Not applicable

Example: [0.3 0.2 0.1]

Example: 'green'

'MarkerSize' — Marker size

6 (default) | positive value

Marker size, specified as a positive value in points.

Example: 10

Output Arguments

obj — One or more objects

scalar | vector

One or more objects, returned as a scalar or a vector. The object is either a function surface object or parameterized mesh object, depending on the type of plot. You can use these objects to query and modify properties of a specific line. For details, see FunctionSurface Properties and ParameterizedFunctionSurface Properties.