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Jan
20
answered How to identify patterns in a tensor-polynomial and replace appropriate symbol?
Jan
20
comment How to identify patterns in a tensor-polynomial and replace appropriate symbol?
+1 But I just noticed it doesn't work if there's a constant term, as in 1 + r[i] ...
Jan
20
comment Why does Simplify ignore an assumption?
@NickStranniy That could very well be where I first read about this problem, too. Thanks for the link!
Jan
19
comment How can I solve this PDE with initial conditions?
@Silvia That notation doesn't really matter (OK, one has to add /.t->0 in his approach, but it's not the main problem). I feel tempted to answer, but it looks a lot like a homework problem. As a hint: first solve without the initial conditions, leading to two functions C[1] and C[2]. Then find those functions by imposing the initial conditions at t = 0. This can be done by converting both conditions to a set of equations only involving C'[i] at x and -x.
Jan
19
revised Label area on plot
added 61 characters in body
Jan
19
answered Label area on plot
Jan
19
comment Complex Region using Presentations Package
I don't have the package (heard only good things about it!) but from looking at your syntax my guess would be: the first argument in ComplexRegionDraw[Exp[z]... has to be a boolean condition, not a complex function. Therefore, you should replace that by Abs[Exp[z]]<1, or Re[Exp[z]]>0, or some condition along those lines.
Jan
18
awarded  Nice Answer
Jan
18
answered Making data persistent, as in xmgrace
Jan
18
comment Label area on plot
Related question: Scale Insetted Characters to Plot
Jan
18
revised Representation of product with exclusions
typo
Jan
18
revised Representation of product with exclusions
Resolution of graphics was bad (Retina display doesn't work with notebooks)
Jan
18
answered Representation of product with exclusions
Jan
18
comment How to systematically classify Mathematica expressions?
I would claim that you cannot learn anything about Mathematica expressions from that book. I own the hard copy because my kids like the patterns.
Jan
17
comment Rayleigh Criterion
+1 for trying to answer a moving-target question.
Jan
17
revised How to save a GraphicsRow output?
Added extend selection
Jan
17
answered How to save a GraphicsRow output?
Jan
17
comment How to study asymptotic behavior, built-in functions
Closely related question: How to expand a function into a power series with negative powers?
Jan
17
answered Why does Simplify ignore an assumption?
Jan
17
comment Ways to compute inner products of tensors
@Artes I think I'd like it better if autocomplete choices only appeared after pressing a certain special key (like Tab), not immediately while in the middle of a word. I find that intrusive.