Hello and sorry to be late,

as far as I understand, you have plotted the function defined by : cos(theta1)*tan( tetha2)+ acos(theta3) = L

This function was just an example bu not the true, nevermind.

I try to explain better my problem : I ve 3 functions defined by 3 parameters, thoses 3 functions represent a vector :

X = f(theta1,theta2,theta3)

Y = g(theta1,theta2,theta3)

Z = h(theta1,theta2,theta3)

If I want to have a surface and not a solid region trace out by the vector [X,Y,Z] when theta1,2,3 vary from 0 to 90, I have to add condition which link theta1,2,3 for exemple sqrt ( X^2 + Y^2 + Z^2) = Radius

This condition will link theta1,2,3 and I would like to plot only the surface = equation vector + condition, is there a way to plot a function with condition on parameters ?

for example :

assume (sqrt ( X^2 + Y^2 + Z^2) = Radius);

plot3d({X,Y,Z}, theta1=0..Pi, theta2=0..Pi, ---------etc--------------);

in this plot I didn't tell maple range for theta3 because theta3 is defined by the condition sqrt ( X^2 + Y^2 + Z^2) = Radius when theta1,2 are defined.

I hope I am more precise.

Thank's

Sorry I made a mistake, the function is nu=f(theta1,theta2)

Here is the function (I have substitute L, R and theta3 by value) :

http://img507.imageshack.us/img507/7240/theta2.jpg

Here is an example of plotting :

http://img508.imageshack.us/img508/6786/78110090.jpg

you can see the gap although in reality there is no gap !

Thank's

Thank's for your answer.

You're true, the vector will trace out a solid region, so I ve to add a constraint (its length for example).

But I don't know how if maple can plot a function with constraint ?

For example (the right expression is very difficult) cos(theta1)*tan( tetha2)+ acos(theta3) = L

Thank's

Thank's for your answer.

You're true, the vector will trace out a solid region, so I ve to add a constraint (its length for example).

But I don't know how if maple can plot a function with constraint ?

For example (the right expression is very difficult) cos(theta1)*tan( tetha2)+ acos(theta3) = L

Thank's