1
vote
1answer
114 views

3D Contour Plot - parts with gradients less and more than zero

I'm trying to plot sections of the 3D Contours, with gradient less than zero, and more than zero and equal to zero. It manages to solve for the derivative, but when I apply the conditions ...
7
votes
1answer
177 views

Plotting a region with polar axes

I want to plot the region of points who satisfy the following equation: 2 < r <= 5 && 3/4 π < θ <= 5/4 π I have been able to plot region in ...
6
votes
1answer
111 views

Can't plot rotated region

I was experimenting with the code from this question when I ran into another problem with regions. ...