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Feb
4
comment Strange behaviour of NotElement in Reduce
@jkuczm I haven't reported it yet. I want to give WRI support some slack - I've written three bug reports in a week, or something like that. So, go ahead (and reference this Mma.SE question in case they would want to participate directly).
Feb
3
comment Improving visibility of text in scanned image
@JasonB Like most heuristic image processing algorithms, sometimes it works, sometimes not...
Feb
3
comment Improving visibility of text in scanned image
Here might be a good place to point out the existence of LocalAdaptiveBinarize. Its documentation has an example with highly variable text contrast, just in case source material is less than stellar in quality.
Feb
3
revised Finding a vector many times
edited tags
Feb
3
comment Personal Reminder with Speak capability repeats multiple times
Have you considered something simpler, such as RunScheduledTask[Speak["Test"]; RemoveScheduledTask[$ScheduledTask], {0}, AbsoluteTime[] + 5 (* seconds *)] ?
Feb
2
reviewed Approve How to make a contour shading like this
Feb
2
revised Strange behaviour of NotElement in Reduce
added 7 characters in body
Feb
2
revised Strange behaviour of NotElement in Reduce
added 723 characters in body
Feb
2
comment Strange behaviour of NotElement in Reduce
@gwr This all makes me wonder what's special about Element and NotElement inside Reduce, and how they're handled there. One more example to consider: Reduce[x - E == 1 - E, x, Integers] doesn't fail to return the correct answer, and according to Trace, the equation is not simplified before it gets passed to Reduce.
Feb
2
comment Strange behaviour of NotElement in Reduce
@gwr Yes, this is - sort of - what I have suspected, but how is this behaviour - or rather, behaviour of Element inside Reduce as demonstrated in the end of my question - consistent with this interpretation? I can't wrap my mind around it.
Feb
2
revised Strange behaviour of NotElement in Reduce
deleted 8 characters in body
Feb
2
asked Strange behaviour of NotElement in Reduce
Feb
2
comment Distance between a circle and a line
It is easy to think of at least half a dozen methods to solve this in Mma, varying in their levels of "don't make me think". :)
Feb
2
comment Distance between a circle and a line
The most straightforward, although not the most efficient answer to this problem would be direct conversion to minimizing implicit region distances: MinValue[RegionDistance[ImplicitRegion[(x - 3)^2 + (y + 2)^2 == 4, {x, y}], {x1, y1}], {x1, y1} \[Element] ImplicitRegion[x + 2 y == 9, {x, y}], {x1, y1}, Reals]
Feb
1
comment Get rational and irrational parts
BTW: One can use ToNumberField[num][[2, 1]] to extract the rational part ("a") of any quadratic field. No need to even specify the generator!
Feb
1
revised Is there a way to find the values of x for a graph in a given area?
added 4 characters in body
Feb
1
reviewed Approve Visualize how a function varies as its parameters vary
Jan
31
revised How to compare two polygons?
added 114 characters in body
Jan
31
revised Is there a way to find the values of x for a graph in a given area?
deleted 3 characters in body
Jan
31
comment Imaginary part of complex number, nothing works?
Consider tugging // ComplexExpand // Simplify on the end.