Question about combining surf and plot3 (2024)

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Saddam N Y on 26 Jun 2024 at 9:37

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Edited: Star Strider about 8 hours ago

Question.mat

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Hello all,

I would like to plot a 3D plot in which I plot some scattered 3D points and at the same time I would like to plot surfaces which correspond to the limits of the ranges of my three variables. I attach a .dat file which contains the variables, the variable 'parameters' contain the 3D data which to be plotted, they are 500 data points for each of the three variables. The variables p1, p2 and p3 contain the ranges of my three variables, I would like to plot the surfaces which correspond to the limits of these variables, for example for the third variable, this will do the job for the lower limit:

surf(p3(1)*ones(size(parameters,2),size(parameters,2)),'FaceColor','r','FaceAlpha',0.3,'EdgeColor','none')

I have a problem which is that after I use the command plot3 to plot the data as follows:

figure('units','normalized','outerposition',[0 0 1 1])

surf(p3(1)*ones(size(parameters,2),size(parameters,2)),'FaceColor','r','FaceAlpha',0.3,'EdgeColor','none')

hold on

plot3(parameters(1,:),parameters(2,:),parameters(3,:),'*r','MarkerSize',15)

hold on

plot3(parameters(1,IDEIM_mu),parameters(2,IDEIM_mu),parameters(3,IDEIM_mu),'ko','MarkerSize',20)

xlim([0.8*p1(1) 1.2*p1(2)]);

ylim([0.8*p2(1) 1.2*p2(2)]);

zlim([0.8*p3(1) 1.2*p3(2)]);

Then the first surface plot disappers. Could you please let me know how I could combine the two kind of plots ? Thanks.

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Aquatris on 26 Jun 2024 at 10:44

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Edited: Aquatris on 26 Jun 2024 at 10:45

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Ran in:

My guess is your axis limits are not covering the surface plot. Comment them out and see if your surface plot is still there. If it is still there, you should adjust your axis limits

[X,Y] = meshgrid(1:0.5:10,1:20);

Z = sin(X) + cos(Y);

xDot = [8 6 1];

yDot = [2 12 16];

zDot = [.5 1 .8];

surf(X,Y,Z)

hold on

plot3(xDot,yDot,zDot,'r-*' )

hold off

Answers (1)

Star Strider on 26 Jun 2024 at 12:21

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Edited: Star Strider about 5 hours ago

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Ran in:

Question.mat

TThe first ‘surface plot’ is just a patch plot at that goes from 0 to 500 in each (x,y) direction, at a z-value of 0.002, as can be seen when plottting it. Since xlim is set to [4E+7 6E+9] the surface plot simply never appears, since it is outside those limits.

load('Question.mat')

whos('-file','Question.mat')

Name Size Bytes Class Attributes IDEIM_mu 1x20 160 double line1 2x1 16 matlab.graphics.chart.decoration.ConstantLine line2 2x1 16 matlab.graphics.chart.decoration.ConstantLine p1 2x1 16 double p2 2x1 16 double p3 2x1 16 double parameters 3x500 12000 double t 1x501 4008 double

Data_Presented_To_surf = p3(1)*ones(size(parameters,2),size(parameters,2))

Data_Presented_To_surf = 500x500

0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020

<mw-icon class=""></mw-icon>

format shortG

figure('units','normalized','outerposition',[0 0 1 1])

surf(p3(1)*ones(size(parameters,2),size(parameters,2)),'FaceColor','r','FaceAlpha',0.3,'EdgeColor','none')

hold on

plot3(parameters(1,:),parameters(2,:),parameters(3,:),'*r','MarkerSize',15)

hold on

plot3(parameters(1,IDEIM_mu),parameters(2,IDEIM_mu),parameters(3,IDEIM_mu),'ko','MarkerSize',20)

xlim([0.8*p1(1) 1.2*p1(2)]);

xlim

ans = 1x2

1.0e+00 * 4e+07 6e+09

<mw-icon class=""></mw-icon>

ylim([0.8*p2(1) 1.2*p2(2)]);

ylim

ans = 1x2

0.016 0.132

<mw-icon class=""></mw-icon>

zlim([0.8*p3(1) 1.2*p3(2)]);

zlim

ans = 1x2

0.0016 0.0132

<mw-icon class=""></mw-icon>

EDIT — (28 Jun 2024 at 02:37)

To make the red surface aappear, just give it tthe appropriate (x,y) coorinates —

xs = linspace(min(ylim), max(xlim), 500);

ys = linspace(min(ylim), max(ylim), 500);

figure('units','normalized','outerposition',[0 0 1 1])

surf(xs, ys, p3(1)*ones(size(parameters,2),size(parameters,2)),'FaceColor','r','FaceAlpha',0.3,'EdgeColor','none')

hold on

plot3(parameters(1,:),parameters(2,:),parameters(3,:),'*r','MarkerSize',15)

hold on

plot3(parameters(1,IDEIM_mu),parameters(2,IDEIM_mu),parameters(3,IDEIM_mu),'ko','MarkerSize',20)

xlim([0.8*p1(1) 1.2*p1(2)]);

xlim

ans = 1x2

1.0e+00 * 4e+07 6e+09

<mw-icon class=""></mw-icon>

ylim([0.8*p2(1) 1.2*p2(2)]);

ylim

ans = 1x2

0.016 0.132

<mw-icon class=""></mw-icon>

zlim([0.8*p3(1) 1.2*p3(2)]);

... and there it is!

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