- Looking through the demos, I see some things that as far as I know are

not documented or hardly mentioned in any of my reading about graphing

calculator. Is there a place where I can find out more secrets?

For example, under Examples/Three Dimensions/Tangent Plane, what do

the ug(a,b) and vh(a,b) do?

Also under Examples/Advanced Topics/Dot Product, you can drag the

endpoints of both vectors around and the complex number is

automaticaly updated. Is there a way to make it so that a point in

the standard x-y plane can be dragged around the graph and the x and y

coordinates would be automatically updated?

Any help would be greatly appreciated. Thanks - On Feb 18, 2009, at 3:08 PM, johnalbers2003 wrote:
Looking through the demos, I see some things that as far as I know are

not documented or hardly mentioned in any of my reading about graphing

calculator. Is there a place where I can find out more secrets?

For example, under Examples/Three Dimensions/Tangent Plane, what do

the ug(a,b) and vh(a,b) do?These are actually the "graphing variables"*u*and*v*multiplying the functions g(a,b) and h(a,b).I've redone the file slightly below to make it clearer (at least to me) what's going on:Both of the equations below work, but the second version is more streamlined, and enables you to use more surface graphics, such as checkerboarding, as shown. - On Feb 18, 2009, at 3:08 PM, johnalbers2003 wrote:
Also under Examples/Advanced Topics/Dot Product, you can drag the

endpoints of both vectors around and the complex number is

automaticaly updated. Is there a way to make it so that a point in

the standard x-y plane can be dragged around the graph and the x and y

coordinates would be automatically updated?It's actually the points "a" and "b", represented by complex numbers, that are being dragged around.