Plotting f (x, y) = ln(x^2 + y^2 ) - Mathematica Help

[kash-k]

I'm trying to plot this
f (x, y) = ln(x^2 + y^2 )

any one got a idea how to?

 

[Philosophaie]

Plot3D[f, {x, xmin, xmax}, {y, ymin, ymax}]
make a three-dimensional plot of f as a function of the
variables x and y

 

[EnumaElish]

More accurately,

Plot3D[Log[x^2 + y^2], {x, xmin, xmax}, {y, ymin, ymax}]

or

f[x_,y_]=Log[x^2 + y^2]
Plot3D[f[x,y], {x, xmin, xmax}, {y, ymin, ymax}]

 

[kash-k]

i want to make this symmetric in both x and y with 2 graph by using the cartesian coordinate system with the plot3D command and secondly using the cyclindrical coordinate system using the parametricplot3d command. been a long time since I've used mathematica but i don't think your codes does the above right?

 

[kash-k]

anyone ?

 

[EnumaElish]

You can have symmetric x and y axes by specifying xmin=ymin and xmax=ymax, either in Plot3D or in ParametricPlot3D.

For more info, see: http://reference.wolfram.com/mathematica/ref/Plot3D.html

and http://reference.wolfram.com/mathematica/ref/ParametricPlot3D.html