# Make a 2D Plot with 3 variables

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Gekkouga on 4 Sep 2020
Commented: KSSV on 4 Sep 2020
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.
Arthur Roué on 4 Sep 2020
If you want a 2D representation, you can use contour function.

KSSV on 4 Sep 2020
[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)
##### 2 CommentsShowHide 1 older comment
KSSV on 4 Sep 2020
Have a look on scatter, scatter3 you can plot with different colors and see the variations.

R2020a

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