Projection of 3D positions histograms in planes XY, YZ, and XZ

I have N points whose 3D coordinates are given. I want to plot 2D histograms for the x- and y-coordinates on XY plane at Z=0 of a 3D box. Next, on the adjacent walls of this box, I have to plot 2D histograms for y- and z-coordinates on YZ plane at X=0 and 2D histogram for x- and z-coordinates on XZ plane at Y=0.

[darova]

Use hist3 to calculate a matrix of values

[Yatish Chandra]

Yes, 'hist3' takes in any Nx2 matrix to plot histograms bars in 3D. I am not sure how that helps?

Answer 1

[darova]

Here is an example

m = 20;
    % generate some data
n = 500;
x = randn(500,1);
y = randn(500,1);
z = randn(500,1);
    % create regular grid
x1 = linspace(min(x),max(x),m);
y1 = linspace(min(y),max(y),m);
[X,Y] = meshgrid(x1,y1);
    % calculate density matrix
xy = hist3([x y],[m m]);
plot3(x,y,z,'.r')
surface(X,Y,xy*0-5,'cdata',xy)
axis vis3d

[Yatish Chandra]

m = 20;
    % generate some data
n = 500;
x = randn(500,1);
y = randn(500,1);
z = randn(500,1);
    % create regular grid
x1 = linspace(min(x),max(x),m);
y1 = linspace(min(y),max(y),m);
z1 = linspace(min(z),max(z),m);
[X,Y] = meshgrid(x1,y1);
Z=X; % HELPPPP I just tried this and instead of the third projection, I get a line.
    % calculate density matrix
xy = hist3([x y],[m m]);
yz = hist3([y z],[m m]);
xz = hist3([x z],[m m]);
plot3(x,y,z,'.r')
surface(X,Y,xy*0-5,'cdata',xy)
surface(yz*0-5,Y,Z,'cdata',yz)
surface(X,xz*0-5,Z,'cdata',xz)
axis vis3d

Please run this code. I have added a few extra lines. Everything looks very fine but I need the third projection as well. For that I need a new variable Z.

[darova]

Transpose Z matrix

surface(X,xz*0-5,Z','cdata',xz)

[Yatish Chandra]

Thanks! It worked

[darova]

My pleasure