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  • 33 votes cast
May
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Oct
9
comment Coloring random points in an annulus
@kguler: Yes, when I set randomInAnnulus[R1_, R2_, cb_: 0, n_: 100] := Transpose@{# Cos@#2 + cb, # Sin@#2 + cb} &[ Sqrt@RandomReal[{R1, R2}^2, n], RandomReal[2 \[Pi], n]]; and I pick cb so large that x*y > 0 for all points I get an error.
Oct
8
comment Coloring random points in an annulus
It does work well, but if I replace the condition for the check with another one it fails if there are no such points (for instance when I shift the annulus in the first kwadrant. Is there an easy way to resolve this?
Oct
7
accepted Coloring random points in an annulus
Oct
6
comment Coloring random points in an annulus
Is there any advantage (i.e., speed) in using any of those three?
Oct
6
comment Coloring random points in an annulus
Yes, I have noticed it is quite slow. Do you have any ideas how to do it faster?
Oct
6
asked Coloring random points in an annulus
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25
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Apr
7
comment How do I use the result of Solve in a function definition?
@SjoerdC.deVries Well, when at the same time when I call a function. So not only if I execute the whole worksheet.
Apr
7
accepted How do I use the result of Solve in a function definition?
Apr
7
comment How do I use the result of Solve in a function definition?
@SjoerdC.deVries Thanks. I know this, but the way I made it set Z to a particular value, but I have fixed it in another way.
Apr
6
comment How do I use the result of Solve in a function definition?
@RM Right, good point! Can you explain why I cannot use capital letters as function names?
Apr
6
comment How do I use the result of Solve in a function definition?
Thanks, I will try this, but I think there was a problem when $z$ was already set (by running it once with different amax). Is there a way to reset the value of z before doing a computation?