To superpose 2d plots, I just use the command `hold on` before plotting. However, when I try using this with 3d plots `plot3()`, I get a 2d projection of the superposed plots, instead of getting a 3d plot. What is going on?
gives me a 3d plot as expected. However, adding a point at the origin:
gives a flat 2d image. Am I typing something wrong? Thank you.