# Problem with Interdependent Variables in Coordinate System Demonstration

Posted 2 years ago
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 I'm trying to develop a tool/demonstration for my Calculus II and III classes, showing different coordinate systems. I have one for rect. and polar, and another for rect., cylindrical, and spherical, but I've posted only the rect./polar one, as the problem I'm encountering in both seems to be the same. The idea is that students can manipulate either the rectangular coordinates or polar coordinates, and the other will update dynamically. The point with the given coordinates is also displayed on the plane. When I manipulate x,y, or r, everything seems to work fine, but when I update theta, none of the other variables update dynamically, and the point doesn't move. I can't seem to figure out why. Any help would be much appreciated. Attachments:
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Posted 2 years ago
 It's the damndest thing, but I got it to work by changing the upper-bound value of theta to: {\[Theta], 0}, 0, 2 N[\[Pi]], 
Posted 2 years ago
 Nice Manipulate!You need to make the bounds of both Rho and Theta similar, i.e. make the Theta as you have it with Rho, { [Theta], 0}, 0, 10]. Regards
Posted 2 years ago
 Thank you both. Getting rid of the symbol ? in the bounds (or enclosing it in N[]) solved the problem. I don't know enough about the inner workings of Mathematica to know why this would cause such an issue.