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Jul
19
comment Solve matrix equation A*X=X*B using LeastSquares
@mrgloom See this article. Checking if the two matrices commute may not be completely trivial if they consist of floating point numbers. My first approach would be PossibleZeroQ...
Jul
16
comment Adding a tree to a list of trees within a loop
You should really go through some basic Mathematica tutorials first, it works very differently than you think it does. For your question at hand take a look at this post (and the whole thread in general!)
Jul
16
comment Issuing user-defined messages takes a long time (Message is slow)
Front end. They are basically what you have in both cases.
Jul
16
comment Issuing user-defined messages takes a long time (Message is slow)
I have very similar timings under V8 and V10 (did not check V9 now) under Linux
Jul
12
comment Potential pollution of Global` context in fresh kernel
Nevermind my earlier comment, I get {"list", "msgs", "rhs", "z"} under Linux.
Jul
10
comment Transparency rendering problems in Mathematica 10 (Mac)
I can reproduce the dots you see under Linux. Also, I think that @Thomas is correct. Try this: Contours -> {.9}, ContourShading -> None, ContourStyle -> {{Red,Thickness[0.1]}}
Jun
18
comment Mathematica Destructuring
I just stumbled over this and I have to say I really like it! Using this with the shorthand notation is especially neat!
May
15
comment Is there a way to solve the linear equation, Ax=b, in which A is a “non-constant” sparse matrix that depends on x?
@murray I'm a bit confused by your comment... How is it a linear equation if A depends on x at all?
May
2
comment How to exchange two arguments?
Very neat! Never thought about this one!
Apr
23
comment Performance regression for Fold?
I can confirm the exact same behaviour on Linux Mint Debian with both Mathematica 8 and 9.
Apr
23
revised Solving a stochastic differential equation
deleted 4 characters in body
Apr
15
comment How can I calculate the limit without using the L'Hopital's rule
Nice, I like this way much better :)
Apr
14
comment How can I calculate the limit without using the L'Hopital's rule
Ok, we will see what the OP says anyways.
Apr
14
comment How can I calculate the limit without using the L'Hopital's rule
I am guessing this is math homework and should be migrated, don't you think so?
Feb
12
comment Make Sinc'[0] return 0 instead of Indeterminate
I of course agree that you need to take the limit but the same reasoning could be applied to Sinc alone. So I agree with @Rojo above that the reason to have a Sinc function should be that you don't have to evaluate Limit[Sin[x]/x,x->0] every time. It would be nice if the same was true for Sinc'.
Feb
11
comment Double integral with variable in the limits
@AlexeiBoulbitch Can you elaborate on your comment a bit? I would be interested what you mean with quasi analtytical. Also, how do you know it's not dimensionless?
Feb
6
comment Integration of DiracDelta
I think it would be nice to replace the integration region in the first integral by R^3 though.
Feb
6
comment Integration of DiracDelta
Hmpf... you beat me to it ;) +1
Feb
2
awarded  Yearling
Jan
7
comment Understanding Villegas-Gayley
@JacobAkkerboom Could you explain to us what you mean by downcode?