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小百科  ›  surf - 3D surface plot
Scilab 平面计算机
风流倜傥的松鼠
9 月前

two vectors of real numbers, of lengths nx and ny ; or two real matrices of sizes ny x nx : They define the data grid (horizontal coordinates of the grid nodes). All grid cells are quadrangular but not necessarily rectangular.

By default, X = 1:size(Z,2) and Y = 1:size(Z,1) are used.

a real matrix explicitly defining the heights of nodes, of sizes ny x nx .

handle of a function, as in surf(x,y, myFun) where the expected syntax of myFun is Z=myFun(X,Y) .

If the 2D function fun to plot needs some parameters as input arguments, the function and its parameters can be specified through a list, as in surf(x,y, list(delip, -0.4)) or surf(x,y, list(myfun, a,b)) with Z = myFun(X,Y, a,b)

If X or/and Y are grid-generating vectors while fun(…) expects only input matrices, surf(…) automatically generates matrices from X or/and Y and properly calls fun(…) .

colors

an optional real matrix defining a colors value for each (X(j),Y(i)) point of the grid (see description below).

<GlobalProperty>

Sequence of couple statements {PropertyName,PropertyValue} that defines global objects' properties applied to all the curves created by this plot. For a complete view of the available properties (see GlobalProperty ).

axes_handle

Handle of the graphical axes where the surface must be drawn. The default axes used is the active gca() one.

This optional output contains a handle to the created Fac3d entity. Use h to modify its properties For a list of properties, see surface_properties .

Description

surf draws a colored parametric surface using a grid whose nodes coordinates are defined by X and Y . At each node of this grid, a Z coordinate is given using the Z matrix.

surf has been created to better handle Matlab syntax. To improve graphical compatibility, Matlab users should use surf rather than plot3d .

Data entry specification :

In this paragraph and to be clearer, we won't mention GlobalProperty optional arguments as they do not interfere with entry data (except for "Xdata" , "Ydata" and "Zdata" property, see GlobalProperty ). It is assumed that all those optional arguments could be present too.

X or Y can be :

  • a) a vector : if X is a vector, length( X )= nx . Respectively, if Y is a vector, length( Y )= ny .

    b) a matrix : in this case, size( X ) (or size( Y )) must equal size( Z ).

Color entry specification :

As stated before, the surface is created over a rectangular grid support. Let consider two independent variables i and j such as :

a) 1 <= i <= ny and 1 <= j <= nx b) i-1,j-1 ---- i-1,j ---- i-1,j+1 ---… | | | | | i direction i,j-1 ----- i,j ----- i,j+1 ---… | | | | | : : : ............> j direction

This imaginary rectangular grid is used to build the real surface support onto the XY plane. Indeed, X , Y and Z data have the same size (even if X or Y is vector, see below) and can be considered as 3 functions x(i,j) , y(i,j) and z(i,j) specifying the desired surface. If X or Y are vectors, they are internally treated to produce good matrices matching the Z matrix dimension (and the grid is forcibly a rectangular region).

Considering the 3 functions x(i,j) , y(i,j) and z(i,j) , the portion of surface defining between two consecutive i and j is called a patch.

By default, when no colors matrix is added to a surf call, the colors parameter is linked to the Z data. When a colors matrix is given, it can be applied to the patch in two different ways : at the vertices or at the center of each patch.

That is why, if Z is a [ ny x nx ] matrix, the C colors matrix dimension can be [ ny x nx ] (one color defined per vertex) or [ ny-1 x nx-1 ] (one color per patch).

Color representation also varies when specifying some GlobalPropery:

The FaceColor property sets the shading mode : it can be 'interp' or 'flat' (default mode). When 'interp' is selected, we perform a bilinear color interpolation onto the patch. If size( C ) equals size( Z )-1 (i.e. we provided only one color per patch) then the color of the vertices defining the patch is set to the given color of the patch.

When 'flat' (default mode) is enabled we use a color faceted representation (one color per patch). If size( C ) equals size( Z ) (i.e. we provided only one color per vertices), the last row and column of C are ignored.

The GlobalProperty arguments should be used to customize the surface. Here is a brief description on how it works:

GlobalProperty

This option may be used to specify how all the surfaces are drawn. It must always be a couple statement constituted of a string defining the PropertyName , and its associated value PropertyValue (which can be a string or an integer or... as well depending on the type of the PropertyName ). Note that you can set multiple properties : the face & edge color, color data, color data mapping, marker color (foreground and background), the visibility, clipping and thickness of the edges of the surface... (see GlobalProperty )

Note that all these properties can be (re-)set through the surface entity properties (see surface_properties ).

By default, successive surface plots are superposed. To clear the previous plot, use clf() . To set the auto_clear mode as the default one for forthcoming axes, execute gda().auto_clear = 'on' .

Enter the command surf to see a demo.

Examples

With a function: 

function z=mySurf(x, y, a, b)
    if ~isdef("a","l"), a = 1, end
    if ~isdef("b","l"), b = 1, end
    z = a*x.*sin(y) + b*y.*cos(x);
endfunction
subplot(121), surf(-5:0.2:5, -3:0.2:3, mySurf)              // without parameters
subplot(122), surf(-5:0.2:5, -3:0.2:3, list(mySurf, 2




    
,-1))  // with parameters
gcf().color_map = jet(100);
set(gcf(), "axes_size", [800 350], "rotation_style","multiple");
gca().rotation_angles = [40 -60];

surf(Z) : 

// Z initialisation
Z= [0.0001    0.0013    0.0053   -0.0299   -0.1809   -0.2465   -0.1100   -0.0168   -0.0008   -0.0000
    0.0005    0.0089    0.0259   -0.3673   -1.8670   -2.4736   -1.0866   -0.1602   -0.0067    0.0000
    0.0004    0.0214    0.1739   -0.3147   -4.0919   -6.4101   -2.7589   -0.2779    0.0131    0.0020
   -0.0088   -0.0871    0.0364    1.8559    1.4995   -2.2171   -0.2729    0.8368    0.2016    0.0130
   -0.0308   -0.4313   -1.7334   -0.1148    3.0731    0.4444    2.6145    2.4410    0.4877    0.0301
   -0.0336   -0.4990   -2.3552   -2.1722    0.8856   -0.0531    2.6416    2.4064    0.4771    0.0294
   -0.0137   -0.1967   -0.8083    0.2289    3.3983    3.1955    2.4338    1.2129    0.2108    0.0125
   -0.0014   -0.0017    0.3189    2.7414    7.1622    7.1361    3.1242    0.6633    0.0674    0.0030];
// simple surface
subplot(121)
surf(Z);  // Note that X and Y are determined by Z dimensions
// same surface with red face color and blue edges
subplot(122)
surf(Z,'facecol','red','edgecol','blu');
gcf().axes_size = [850 400];

surf(X, Y, Z) : 

// X and Y initialisation
// NB: here, X has the same lines and Y the same columns
X=[-3.0000   -2.3333   -1.6667   -1.0000   -0.3333    0.3333    1.0000    1.6667    2.3333    3.0000
   -3.0000   -2.3333   -1.6667   -1.0000   -0.3333    0.3333    1.0000    1.6667    2.3333    3.0000
   -3.0000   -2.3333   -1.6667   -1.0000   -0.3333    0.3333    1.0000    1.6667    2.3333    3.0000
   -3.0000   -2.3333   -1.6667   -1.0000   -0.3333    0.3333    1.0000    1.6667    2.3333    3.0000
   -3.0000   -2.3333   -1.6667   -1.0000   -0.3333    0.3333    1.0000    1.6667    2.3333    3.0000
   -3.0000   -2.3333   -1.6667   -1.0000   -0.3333    0.3333    1.0000    1.6667    2.3333    3.0000
   -3.0000   -2.3333   -1.6667   -1.0000   -0.3333    0.3333    1.0000    1.6667    2.3333    3.0000
   -3.0000   -2.3333   -1.6667   -1.0000   -0.3333    0.3333    1.0000    1.6667    2.3333    3.0000
   -3.0000   -2.3333   -1.6667   -1.0000   -0.3333    0.3333    1.0000    1.6667    2.3333    3.0000
   -3.0000   -2.3333   -1.6667   -1.0000   -0.3333    0.3333    1.0000    1.6667    2.3333    3.0000];
Y=[-3.0000   -3.0000   -3.0000   -3.0000   -3.0000   -3.0000   -3.0000   -3.0000   -3.0000   -3.0000
   -2.3333   -2.3333   -2.3333   -2.3333   -2.3333   -2.3333   -2.3333   -2.3333   -2.3333   -2.3333
   -1.6667   -1.6667   -1.6667   -1.6667   -1.6667   -1.6667   -1.6667   -1.6667   -1.6667   -1.6667
   -1.0000   -1.0000   -1.0000   -1.0000   -1.0000   -




    
1.0000   -1.0000   -1.0000   -1.0000   -1.0000
   -0.3333   -0.3333   -0.3333   -0.3333   -0.3333   -0.3333   -0.3333   -0.3333   -0.3333   -0.3333
    0.3333    0.3333    0.3333    0.3333    0.3333    0.3333    0.3333    0.3333    0.3333    0.3333
    1.0000    1.0000    1.0000    1.0000    1.0000    1.0000    1.0000    1.0000    1.0000    1.0000
    1.6667    1.6667    1.6667    1.6667    1.6667    1.6667    1.6667    1.6667    1.6667    1.6667
    2.3333    2.3333    2.3333    2.3333    2.3333    2.3333    2.3333    2.3333    2.3333    2.3333
    3.0000    3.0000    3.0000    3.0000    3.0000    3.0000    3.0000    3.0000    3.0000    3.0000];
Z= [0.0001    0.0013    0.0053   -0.0299   -0.1809   -0.2465   -0.1100   -0.0168   -0.0008   -0.0000
    0.0005    0.0089    0.0259   -0.3673   -1.8670   -2.4736   -1.0866   -0.1602   -0.0067    0.0000
    0.0004    0.0214    0.1739   -0.3147   -4.0919   -6.4101   -2.7589   -0.2779    0.0131    0.0020
   -0.0088   -0.0871    0.0364    1.8559    1.4995   -2.2171   -0.2729    0.8368    0.2016    0.0130
   -0.0308   -0.4313   -1.7334   -0.1148    3.0731    0.4444    2.6145    2.4410    0.4877    0.0301
   -0.0336   -0.4990   -2.3552   -2.1722    0.8856   -0.0531    2.6416    2.4064    0.4771    0.0294
   -0.0137   -0.1967   -0.8083    0.2289    3.3983    3.1955    2.4338    1.2129    0.2108    0.0125
   -0.0014   -0.0017    0.3189    2.7414    7.1622    7.1361    3.1242    0.6633    0.0674    0.0030
    0.0002    0.0104    0.1733    1.0852    2.6741    2.6725    1.1119    0.1973    0.0152    0.0005
    0.0000    0.0012    0.0183    0.1099    0.2684    0.2683    0.1107    0.0190    0.0014    0.0000];
scf(3)
surf(X,Y,Z)

surf(X,Y,Z) on a cylindrical grid. . Facets are still quadrangular: 

theta = 0:15:360;
r = 25:5:100;
[R,T] = ndgrid(r,theta);
X = R.*cosd(T);
Y = R.* sind(T);
Z = sinc(R/8);
surf(X, Y, Z)
gcf().color_map = cool(50);
gca().rotation_angles=[195 -155];
// example 3
// X and Y are vectors => same behavior as sample 1
// With vectors, the grid is inevitably rectangular
X = [-3.0000  -2.3333  -1.6667  -1.0000  -0.3333   0.3333   1.0000   1.6667   2.3333   3.0000];
Y = X;
Z =[0.0001    0.0013    0.0053   -0.0299   -0.1809   -0.2465   -0.1100   -0.0168   -0.0008   -0.0000
    0.0005    0.0089    0.0259   -0.3673   -1.8670   -2.4736   -1.0866   -0.1602   -0.0067    0.0000
    0.0004    0.0214    0.1739   -0.3147   -4.0919   -6.4101   -2.7589   -0.2779    0.0131    0.0020
   -0.0088   -0.0871    0.0364    1.8559    1.4995   -2.2171   -0.2729    0.8368    0.2016    0.0130
   -0.0308   -0.4313   -1.7334   -0.1148    3.0731    0.4444    2.6145    2.4410    0.4877    0.0301
   -0.0336   -0.4990   -2.3552   -2.1722    0.8856   -0.0531    2.6416    2.4064    0.4771    0.0294
   -0.0137   -0.1967   -0.8083    0.2289    3.3983    3.1955    2.4338    1.2129




    
    0.2108    0.0125
   -0.0014   -0.0017    0.3189    2.7414    7.1622    7.1361    3.1242    0.6633    0.0674    0.0030
    0.0002    0.0104    0.1733    1.0852    2.6741    2.6725    1.1119    0.1973    0.0152    0.0005
    0.0000    0.0012    0.0183    0.1099    0.2684    0.2683    0.1107    0.0190    0.0014    0.0000];
surf(X,Y,Z)
//LineSpec and GlobalProperty examples:
Z= [   0.0001    0.0013    0.0053   -0.0299   -0.1809   -0.2465   -0.1100   -0.0168   -0.0008   -0.0000
    0.0005    0.0089    0.0259   -0.3673   -1.8670   -2.4736   -1.0866   -0.1602   -0.0067    0.0000
    0.0004    0.0214    0.1739   -0.3147   -4.0919   -6.4101   -2.7589   -0.2779    0.0131    0.0020
   -0.0088   -0.0871    0.0364    1.8559    1.4995   -2.2171   -0.2729    0.8368    0.2016    0.0130
   -0.0308   -0.4313   -1.7334   -0.1148    3.0731    0.4444    2.6145    2.4410    0.4877    0.0301
   -0.0336   -0.4990   -2.3552   -2.1722    0.8856   -0.0531    2.6416    2.4064    0.4771    0.0294
   -0.0137   -0.1967   -0.8083    0.2289    3.3983    3.1955    2.4338    1.2129    0.2108    0.0125
   -0.0014   -0.0017    0.3189    2.7414    7.1622    7.1361    3.1242    0.6633    0.0674    0.0030
    0.0002    0.0104    0.1733    1.0852    2.6741    2.6725    1.1119    0.1973    0.0152    0.0005
    0.0000    0.0012    0.0183    0.1099    0.2684    0.2683    0.1107    0.0190    0.0014    0.0000];
close(winsid()) // destroy all existing figures
e=surf(Z,Z+5) // colors array specified
e.cdata_mapping='direct' // default is 'scaled' relative to the colormap
e.color_flag=3; // interpolated shading mode. The default is 4 ('flat' mode) for surf
X = [ -3.0000   -2.3333   -1.6667   -1.0000   -0.3333    0.3333    1.0000    1.6667    2.3333    3.0000
   -3.0000   -2.3333   -1.6667   -1.0000   -0.3333    0.3333    1.0000    1.6667    2.3333    3.0000
   -3.0000   -2.3333   -1.6667   -1.0000   -0.3333    0.3333    1.0000    1.6667    2.3333    3.0000
   -3.0000   -2.3333   -1.6667   -1.0000   -0.3333    0.3333    1.0000    1.6667    2.3333    3.0000
   -3.0000   -2.3333   -1.6667   -1.0000   -0.3333    0.3333    1.0000    1.6667    2.3333    3.0000
   -3.0000   -2.3333   -1.6667   -1.0000   -0.3333    0.3333    1.0000    1.6667    2.3333    3.0000
   -3.0000   -2.3333   -1.6667   -1.0000   -0.3333    0.3333    1.0000    1.6667    2.3333    3.0000
   -3.0000   -2.3333   -1.6667   -1.0000   -0.3333    0.3333    1.0000    1.6667    2.3333    3.0000
   -3.0000   -2.3333   -1.6667   -1.0000   -0.3333    0.3333    1.0000    1.6667    2.3333    3.0000
   -3.0000   -2.3333   -1.6667   -1.0000   -0.3333    0.3333    1.0000    1.6667    2.3333    3.0000];
Y= [   -3.0000   -3.0000   -3.0000   -3.0000   -3.0000   -3.0000   -3.0000   -3.0000   -3.0000   -3.0000
   -2.3333   -2.3333   -2.3333   -2.3333   -2.3333   -2.3333   -2.3333   -2.3333   -2.3333   -2.3333
   -1.6667   -1.6667   -1.6667   -1.6667   -1.6667   -1.6667   -1.6667   -1.6667   -1.6667   -1.6667
   -1.0000   -1.0000   -1.0000   -1.0000   -




    
1.0000   -1.0000   -1.0000   -1.0000   -1.0000   -1.0000
   -0.3333   -0.3333   -0.3333   -0.3333   -0.3333   -0.3333   -0.3333   -0.3333   -0.3333   -0.3333
    0.3333    0.3333    0.3333    0.3333    0.3333    0.3333    0.3333    0.3333    0.3333    0.3333
    1.0000    1.0000    1.0000    1.0000    1.0000    1.0000    1.0000    1.0000    1.0000    1.0000
    1.6667    1.6667    1.6667    1.6667    1.6667    1.6667    1.6667    1.6667    1.6667    1.6667
    2.3333    2.3333    2.3333    2.3333    2.3333    2.3333    2.3333    2.3333    2.3333    2.3333
    3.0000    3.0000    3.0000    3.0000    3.0000    3.0000    3.0000    3.0000    3.0000    3.0000];
Z= [   0.0001    0.0013    0.0053   -0.0299   -0.1809   -0.2465   -0.1100   -0.0168   -0.0008   -0.0000
    0.0005    0.0089    0.0259   -0.3673   -1.8670   -2.4736   -1.0866   -0.1602   -0.0067    0.0000
    0.0004    0.0214    0.1739   -0.3147   -4.0919   -6.4101   -2.7589   -0.2779    0.0131    0.0020
   -0.0088   -0.0871    0.0364    1.8559    1.4995   -2.2171   -0.2729    0.8368    0.2016    0.0130
   -0.0308   -0.4313   -1.7334   -0.1148    3.0731    0.4444    2.6145    2.4410    0.4877    0.0301
   -0.0336   -0.4990   -2.3552   -2.1722    0.8856   -0.0531    2.6416    2.4064    0.4771    0.0294
   -0.0137   -0.1967   -0.8083    0.2289    3.3983    3.1955    2.4338    1.2129    0.2108    0.0125
   -0.0014   -0.0017    0.3189    2.7414    7.1622    7.1361    3.1242    0.6633    0.0674    0.0030
    0.0002    0.0104    0.1733    1.0852    2.6741    2.6725    1.1119    0.1973    0.0152    0.0005
    0.0000    0.0012    0.0183    0.1099    0.2684    0.2683    0.1107    0.0190    0.0014    0.0000];
scf(2)
surf(X,Y,Z,'colorda',ones(10,10),'edgeco','cya','marker','penta','markersiz',20,'markeredg','yel','ydata',56:65)
Z= [   0.0001    0.0013    0.0053   -0.0299   -0.1809   -0.2465   -0.1100   -0.0168   -0.0008   -0.0000
    0.0005    0.0089    0.0259   -0.3673   -1.8670   -2.4736   -1.0866   -0.1602   -0.0067    0.0000
    0.0004    0.0214    0.1739   -0.3147   -4.0919   -6.4101   -2.7589   -0.2779    0.0131    0.0020
   -0.0088   -0.0871    0.0364    1.8559    1.4995   -2.2171   -0.2729    0.8368    0.2016    0.0130
   -0.0308   -0.4313   -1.7334   -0.1148    3.0731    0.4444    2.6145    2.4410    0.4877    0.0301
   -0.0336   -0.4990   -2.3552   -2.1722    0.8856   -0.0531    2.6416    2.4064    0.4771    0.0294
   -0.0137   -0.1967   -0.8083    0.2289    3.3983    3.1955    2.4338    1.2129    0.2108    0.0125
   -0.0014   -0.0017    0.3189    2.7414    7.1622    7.1361    3.1242    0.6633    0.0674    0.0030
    0.0002    0.0104    0.1733    1.0852    2.6741    2.6725    1.1119    0.1973    0.0152    0.0005
    0.0000    0.0012    0.0183    0.1099    0.2684    0.2683    0.1107    0.0190    0.0014    0.0000];
surf(Z,'cdatamapping','direct')
Z= [   0.0001    0.0013    0.0053   -0.0299   -0.1809   -0.2465   -0.1100   -0.0168   -0.0008   -0.0000
    0.0005    0.0089    0.0259   -0.3673   -1.8670   -2.4736   -1.0866   -0.1602   -0.0067    0.0000
    0.0004    0.0214    0.1739   -0.3147   -4.0919   -6.4101   -2.7589   -0.2779    0.0131    0.0020
   -0.0088   -0.0871    0.0364    1.8559    1.4995   -2.2171   -0.2729    0.8368    0.2016    0.0130
   -0.0308   -0.4313   -1.7334   -0.1148    3.0731    0.4444    2.6145    2.4410    0.4877    0.0301
   -0.0336   -0.4990   -2.3552   -2.1722    0.8856   -0.0531    2.6416    2.4064    0.4771    0.0294
   -0.0137   -0.1967   -0.8083    0.2289    3.3983    3.1955    2.4338    1.2129    0.2108    0.0125
   -0.0014   -0.0017    0.3189    2.7414    7.1622    7.1361    3.1242    0.6633    0.0674    0.0030
    0.0002    0.0104    0.1733    1.0852    2.6741    2.6725    1.1119    0.1973    0.0152    0.0005
    0.0000    0.0012    0.0183    0.1099    0.2684    0.2683    0.1107    0.0190    0.0014    0.0000];
surf(Z,'facecol','interp') // interpolated shading mode (color_flag == 3)
Z= [   0.0001    0.0013    0.0053   -0.0299   -0.1809   -0.2465   -0.1100   -0.0168   -0.0008   -0.0000
    0.0005    0.0089    0.0259   -0.3673   -1.8670   -2.4736   -1.0866   -0.1602   -0.0067    0.0000
    0.0004    0.0214    0.1739   -0.3147   -4.0919   -6.4101   -2.7589   -0.2779    0.0131    0.0020
   -0.0088   -0.0871    0.0364    1.8559    1.4995   -2.2171   -0.2729    0.8368    0.2016    0.0130
   -0.0308   -0.4313   -1.7334   -0.1148    3.0731    0.4444    2.6145    2.4410    0.4877    0.0301
   -0.0336   -0.4990   -2.3552   -2.1722    0.8856   -0.0531    2.6416    2.4064    0.4771    0.0294
   -0.0137   -0.1967   -0.8083    0.2289    3.3983    3.1955    2.4338    1.2129    0.2108    0.0125
   -0.0014   -0.0017    0.3189    2.7414    7.1622    7.1361    3.1242    0.6633    0.0674    0.0030
    0.0002    0.0104    0.1733    1.0852    2.6741    2.6725    1.1119    0.1973    0.0152    0.0005
    0.0000    0.0012    0.0183    0.1099    0.2684    0.2683    0.1107    0.0190    0.0014    0.0000];
scf(10)
axfig10=gca();
surf(axfig10,Z,'ydat',[100:109],'marker','d','markerfac','green','markeredg','yel') // draw onto the axe of figure 10

See also

  • plot2d — 2D plot
  • clf — Clears and resets a figure or a frame uicontrol
  • close — Closes graphic figures, progression or wait bars, the help browser, xcos, the variables browser or editor.
  • delete — delete a graphic entity and its children.
  • LineSpec — to quickly customize the lines appearance in a plot
  • GlobalProperty — customizes the objects appearance (curves, surfaces...) in a plot or surf command

History

Version Description
6.0.2 The "Foreground", "markForeground", and "markBackground" global properties colors can now be specified as named colors chosen in the full predefined colors list, or by their "#RRGGBB" hexadecimal codes, or by their colormap indices. surf(X,Y,fun..) and surf(X,Y,list(fun, params)) syntaxes added.
2025.0.0 Function returns the created handle(s).
Report an issue
<< sphere 3d_plot surface properties >> Last updated:
Thu May 22 12:51:00 CEST 2025
 
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