3D plot isocolor

Hi,

I’m new to matlab and I am trying to make a 3D plot of an equation created from experimental design 3^2 modelling determined from leaching experiments to show the optimisation direction.

The equation is Metal Extraction =1.95+(0.94/2)*A+(0.13/2)*B+(0.40/2)*AC

Where A can be x, B can be y and C can be z.

I have read a few answers and tried isocolors to get a plot using the example from tutorial page, which works for values 1 to 20, but when I use the values from -1 to 1 it comes up with a blank plot.

Could someone please help me in graphing my equation.

[x,y,z] = meshgrid(-1:1,-1:1,-1:1);

data = 1.95+(0.94/2).*x+(0.13/2).*y+(0.40/2).*x.*z ;

cdata = smooth3(rand(size(data)),'box',7);

p = patch(isosurface(x,y,z,data,10));

isonormals(x,y,z,data,p)

isocolors(x,y,z,cdata,p)

p.FaceColor = 'interp';

p.EdgeColor = 'none';

view(150,30)

daspect([1 1 1])

axis tight

camlight

lighting gouraud

I have plotted the equation in excel, but I have to make one variable equal to 1 to get any graphs.

Thanks for the assistance.

Answer 1

[darova]

It is because there is no such value as data=10 for those intervals you set

[x,y,z] = meshgrid(-1:1,-1:1,-1:1);
data = 1.95+(0.94/2).*x+(0.13/2).*y+(0.40/2).*x.*z ;
p = patch(isosurface(x,y,z,data,10));            % try 2 instead of 10

Also [-1:1] interval is only 3 values

>> -1:1
ans =
    -1     0     1

[sarah jones]

Thank you so much for the help. I now get a much better looking graph.

[darova]

you are welcome