MATLAB - fsurf

3-D Surface Plot of Expression

Plot the expression sin(x)+cos(y) over the default interval -5<x<5 and -5<y<5.

  fsurf(@(x,y) sin(x)+cos(y))
fig2plotly()

• Plot
• SSIM

Specify Interval of Surface Plot and Plot Piecewise Expression

Plot the piecewise expression

  None

over -5<y<5.

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

  f1 = @(x,y) erf(x)+cos(y);
fsurf(f1,[-5 0 -5 5])
hold on
f2 = @(x,y) sin(x)+cos(y);
fsurf(f2,[0 5 -5 5])
hold off
fig2plotly()

• Plot
• SSIM

Parameterized Surface Plot

Plot the parameterized surface

  None

for 0<u<2π and 0<v<π. Add light to the surface using camlight.

  r = @(u,v) 2 + sin(7.*u + 5.*v);
funx = @(u,v) r(u,v).*cos(u).*sin(v);
funy = @(u,v) r(u,v).*sin(u).*sin(v);
funz = @(u,v) r(u,v).*cos(v);
fsurf(funx,funy,funz,[0 2*pi 0 pi]) 
camlight
fig2plotly()

• Plot
• SSIM

Add Title and Axis Labels and Format Ticks

For x and y from -2π to 2π, plot the 3-D surface ysin(x)-xcos(y). Add a title and axis labels and display the axes outline.

  fsurf(@(x,y) y.*sin(x)-x.*cos(y),[-2*pi 2*pi])
title('ysin(x) - xcos(y) for x and y in [-2\pi,2\pi]')
xlabel('x');
ylabel('y');
zlabel('z');
box on
fig2plotly()

• Plot
• SSIM

Set the x-axis tick values and associated labels using the XTickLabel and XTick properties of axes object. Access the axes object using gca. Similarly, set the y-axis tick values and associated labels.

  ax = gca;
ax.XTick = -2*pi:pi/2:2*pi;
ax.XTickLabel = {'-2\pi','-3\pi/2','-\pi','-\pi/2','0','\pi/2','\pi','3\pi/2','2\pi'};

ax.YTick = -2*pi:pi/2:2*pi;
ax.YTickLabel = {'-2\pi','-3\pi/2','-\pi','-\pi/2','0','\pi/2','\pi','3\pi/2','2\pi'};

• Plot
• SSIM

Specify Surface Properties

Plot the parametric surface x=usin(v), y=-ucos(v), z=v with different line styles for different values of v. For -5<v<-2, use a dashed green line for the surface edges. For -2<v<2, turn off the edges by setting the EdgeColor property to 'none'.

  funx = @(u,v) u.*sin(v);
funy = @(u,v) -u.*cos(v);
funz = @(u,v) v;

fsurf(funx,funy,funz,[-5 5 -5 -2],'--','EdgeColor','g')
hold on
fsurf(funx,funy,funz,[-5 5 -2 2],'EdgeColor','none')
hold off
fig2plotly()

• Plot
• SSIM

Modify Surface After Creation

Plot the parametric surface

  None

Assign the parameterized function surface object to a variable.

  x = @(u,v) exp(-abs(u)/10).*sin(5*abs(v));
y = @(u,v) exp(-abs(u)/10).*cos(5*abs(v));
z = @(u,v) u;
fs = fsurf(x,y,z)
fig2plotly()

• Plot
• SSIM

  
fs = 
  ParameterizedFunctionSurface with properties:

    XFunction: @(u,v)exp(-abs(u)/10).*sin(5*abs(v))
    YFunction: @(u,v)exp(-abs(u)/10).*cos(5*abs(v))
    ZFunction: @(u,v)u
    EdgeColor: [0 0 0]
    LineStyle: '-'
    FaceColor: 'interp'

  Show all properties


fig2plotly()

Change the plotting interval for u to [-30 30] by setting the URange property of object. Add transparency to the surface by setting the FaceAlpha property to a value between 0 (transparent) and 1 (opaque).

  fs.URange = [-30 30];
fig2plotly()

• Plot
• SSIM

  fs.FaceAlpha = .5;
fig2plotly()

Show Contours Below Surface Plot

Show contours below a surface plot by setting the 'ShowContours' option to 'on'.

  f = @(x,y) 3*(1-x).^2.*exp(-(x.^2)-(y+1).^2)...
    - 10*(x/5 - x.^3 - y.^5).*exp(-x.^2-y.^2)...
    - 1/3*exp(-(x+1).^2 - y.^2);
fsurf(f,[-3 3],'ShowContours','on')
fig2plotly()

• Plot
• SSIM

Control Resolution of Surface Plot

Control the resolution of a surface plot using the 'MeshDensity' option. Increasing 'MeshDensity' can make smoother, more accurate plots while decreasing it can increase plotting speed.

Create two plots in a tiled chart layout. In the first plot, display the parametric surface x=sin(s), y=cos(s), z=(t/10)sin(1/s). The surface has a large gap. Fix this issue by increasing the 'MeshDensity' to 40 in the second plot. fsurf fills the gap, showing that by increasing 'MeshDensity' you increased the resolution.

  tiledlayout(2,1)
nexttile
fsurf(@(s,t) sin(s), @(s,t) cos(s), @(s,t) t/10.*sin(1./s))
view(-172,25)
title('Default MeshDensity = 35')

nexttile
fsurf(@(s,t) sin(s), @(s,t) cos(s), @(s,t) t/10.*sin(1./s),'MeshDensity',40)
view(-172,25)
title('Increased MeshDensity = 40')
fig2plotly()

• Plot
• SSIM