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Oct
28
comment Division by zero is slow
Clever and fast, but I'm going to wonder what the heck it is doing when I come back to read the code a few months later. Comments are for the weak.
Oct
28
comment Division by zero is slow
I like this answer the best. It's a bit wordy, but clear what it is doing. It's fast and flexible (if you want to do more than a simple divide). It's not quite so fast if you want to do a Normal afterwards - about the same speed as the case with no zeroes.
Oct
28
accepted Division by zero is slow
Oct
28
revised Division by zero is slow
added 135 characters in body
Oct
28
awarded  Popular Question
Oct
27
asked Division by zero is slow
Oct
23
comment Why does integration of a radical times HeavisideTheta give a conditional expression?
I get the same as OP on the same version.
Oct
23
revised Ovals of plane curves (and esoteric surfaces in space)
edited body
Oct
23
revised Ovals of plane curves (and esoteric surfaces in space)
Further examples.
Oct
23
answered How do I check to see if two expressions are equal?
Oct
23
comment Ovals of plane curves (and esoteric surfaces in space)
It handles unbounded components. That was the original point - trying to distinguish those. You just can't make rectangles out of them. As for nested ovals, no idea!
Oct
23
revised Ovals of plane curves (and esoteric surfaces in space)
More examples
Oct
23
answered Ovals of plane curves (and esoteric surfaces in space)
Oct
22
comment Ovals of plane curves (and esoteric surfaces in space)
LogicalExpand also helps one see what is going on. I don't have any ideas how to automatically interpret the conditions though.
Oct
22
comment Ovals of plane curves (and esoteric surfaces in space)
Reduce[y^2 - x^3 + x == 0, {x, y}, Reals] gives something tidier with only two cases - one with a bounded range of x, the other unbounded.
Oct
20
answered How do I format the output to include the function definition?
Oct
20
comment How do I format the output to include the function definition?
Perhaps HoldForm[X[x, y, z]] == X[x, y, z] // TraditionalForm?
Oct
15
comment Help recreating a gif
+1. But now colour your lines according to the (dynamic) height.
Oct
13
comment Square root estimation
@dionys I'm not sure why you would expect it to work with negative numbers though. There's nothing in the algorithm that will give you a complex number.
Oct
13
comment Faster way to use Solve in a multiple parameters function
FindRoot finds just a single root numerically. So it will vary depending on where you start it. One technique might be to do a coarse grid with the full Solve. Then use those as starting points for a finer FindRoot grid.