Thread: [Matlab] 2D Sequence Plot in 3D

Dear Friends,

I am trying to plot a 2D sequence in 3D with the following code, but I dont know why it does not work.

Code:

z=ones(30,30);
for i=1:30
    for j=1:30
        z(i,j)=sin(i*j);
    end
end
x=1:30;
y=1:30;
plot3(x,y,z);
grid on;
box on;
xlabel('x');
ylabel('y');
zlabel('z');

My main idea is to put points at when and travels through the integers from to .

Thanks for the help.

Originally Posted by bkarpuz

Dear Friends,

I am trying to plot a 2D sequence in 3D with the following code, but I dont know why it does not work.

Code:

z=ones(30,30);
for i=1:30
    for j=1:30
        z(i,j)=sin(i*j);
    end
end
x=1:30;
y=1:30;
plot3(x,y,z);
grid on;
box on;
xlabel('x');
ylabel('y');
zlabel('z');

My main idea is to put points at when and travels through the integers from to .

Thanks for the help.

Try:

Code:

x=1:30;
y=1:30;
 
[X,Y]=meshgrid(x,y)
Z=sin(X.*Y);
 
plot3(X,Y,Z);

Originally Posted by CaptainBlack

Try:

Code:

x=1:30;
y=1:30;
 
[X,Y]=meshgrid(x,y)
Z=sin(X.*Y);
 
plot3(X,Y,Z);

Ty CB but I have a double sequence (I need to calculate it by iteration).
I could write the following code and it works but I wonder if I can show it as a surface or not (something like meshing but negative parts yellow and positive parts red)?

Code:

z=ones(30,30);
for x=2:30
    for y=2:30
        z(x,y)=power(-1,y)*z(x-1,y)+2*power(-1,x)*z(x,y-1);
    end;
end;
for x=1:30
    for y=1:30
        if z(x,y)>0
            plot3(x,y,z(x,y),'r*');
        else
            plot3(x,y,z(x,y),'y*');
        end
        grid on;hold on;
    end;
end;
box on;
view(0,90);
xlabel('x');
ylabel('y');
zlabel('z');

Thanks again.