Make a 2D Plot with 3 variables

Hi,

I have an equation for a variable R that is dependent on two variables x and y. I solved the equation and have a list of values for R.

How do I plot R with respect to x and y. I can't find a way to specify x and y axis that correspond to the R values.

Thanks.

[Walter Roberson]

How do I plot R with respect to x and y

That sounds as if you have two independent variables and one dependent variable. That would require a 3D plot, unless you wanted to do overlay two different independent variable axes on the same plot (see plotyy() and yyaxis() )

[Gekkouga]

plot3() worked.

I was so silly.

Thanks.

[Arthur Roué]

If you want a 2D representation, you can use contour function.

Answer 1

[KSSV]

Read about contour, countourf, pcolor.

[X,Y,Z] = peaks(100) ; 
figure
pcolor(X,Y,Z) ; sjading interp ; colorbar
figure
contour(X,Y,Z) 
figure
contourf(X,Y,Z)
% 3d representation 
figure
surf(X,Y,Z)

If you don't want to use X, Y use only Z. It will be plotted w.r.t to indices.

[X,Y,Z] = peaks(100) ;
figure
pcolor(Z) ; sjading interp ; colorbar
figure
contour(Z) 
figure
contourf(Z)

[Gekkouga]

Hi,

Thanks for the suggestion. But plot3() is what I was expecting for. It worked.

[KSSV]

Have a look on scatter, scatter3 you can plot with different colors and see the variations.