473 reputation
310
bio website fa.its.tudelft.nl/~teuwen
location Delft, Netherlands
age 28
visits member for 2 years, 11 months
seen Oct 17 at 13:55

About me

I'm a PhD candidate in analysis (harmonic analysis). I have a Master of Science degree in mathematics (analysis).

I am interested in many topics in analysis, but in particular: harmonic analysis, functional analysis, operator theory and special functions.

My email address is jonasteuwen@gmail.com.

I would appreciate it if you would correct my spelling and grammatical errors.


Me elsewhere


Nov
3
awarded  Nice Question
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
Jul
2
awarded  Curious
Apr
26
awarded  Notable Question
Jan
25
awarded  Yearling
Feb
6
awarded  Popular Question
Jan
25
awarded  Yearling
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?
Apr
6
asked How do I use the result of Solve in a function definition?
Mar
11
accepted Indeterminate expression. Where?
Mar
11
asked Indeterminate expression. Where?