Reputation
1,092
Next privilege 2,000 Rep.
Edit questions and answers
Badges
6 19
Newest
 Organizer
Impact
~10k people reached

20h
comment Importing Excel Spreadsheet containing Array Formulas
This bug is still present in 10.1. Any chance to get fixed in 10.2 ?
Jun
23
comment Is FrameTicks broken in 10.1.0?
I would say that rcollyer has provided a convincing argumentation -- somtimes "things change" and we simple humans have to adapt and break with dear habits. ;-) In any case I would suggest to remove the bug tag because Mathematica does behave according to its current documentation.
Jun
23
comment Mathematica learning resource dealing with bayesian inference
+1. Much needed advice since one has to really look hard to find something. There is also the Mathematica Navigator.
Jun
23
comment How to define an expression which is differently evaluated in calculations and printed
+1. Nice collection; I tried to use Format[ nearZero[ val_] ] together with Interpretation but that does not work out as nicely. It really seems to be about "to hold or not to hold".
Jun
22
comment Is there any Mathematica functionality enabling its use for the blind?
Is reading out really helping a blind person? Wouldn't they want to "read" code like on an Refreshable Braille Display? So maybe somekind of BrailleForm would be a start next to Speak?
Jun
21
comment Draw from a given list according to empirical distribution
A couple of data samples and maybe initial attempts would improve the question.
Jun
21
comment Draw from a given list according to empirical distribution
Great if that helped. Btw you may also upvote...hint,hint. ;-)
Jun
21
comment How to elegantly map multiple functions over a matrix?
+1. Great to be reminded for what use case Outer was conceived of.
Jun
20
comment How convert list of numbers to list of points on x-axis?
That is why I sometimes go for the named function as it is so close to mathematics. While beatifully compact I do find other solutions quite unfortunate with regard to transparency and ease of understanding.
Jun
20
comment How convert list of numbers to list of points on x-axis?
I did with 1 Mio random numbers in the vector and the pure function was faster by around 25 % though in absolute duration that did maybe not matter that much (around .13 secs for my machine for the Thread-sokution).
Jun
20
comment How convert list of numbers to list of points on x-axis?
+1. Thread certainly is a beautiful solution. Nevertheless the performance advantage of a pure function seems hard to beat?
Jun
20
comment Simplification of exponential
+1. I had not seen your answer when I posted my comment.
Jun
20
comment Simplification of exponential
This does work ComplexExpand[E^(-2*t*g)*Sqrt[E^(4*t*(g + 2*I*l))]] // FullSimplify[#, {g > 0, t > 0, l > 0}] &.
Jun
12
comment Solving $\frac{dx}{dt} = A \frac{ (1-x)}{(t-t^2)} - \frac{(B*x -C*x^2)}{(t-t^2 )*(t-x)}$
+1. Excellent answer, thank you.
Jun
11
comment Solving $\frac{dx}{dt} = A \frac{ (1-x)}{(t-t^2)} - \frac{(B*x -C*x^2)}{(t-t^2 )*(t-x)}$
In the link provided in the OP (Mathematics SE) a poster hinted at the DE being an Abel ODE which might be solved in closed form by substitution which was also shown in the post there. Those kind of ODE are also known to Mathematica as is documented here‌​. Should Mathematica come up with a closed form solution or can other CAS come up with one? Also I wonder why Version 10.0 gave a solution?
Jun
10
comment Solving $\frac{dx}{dt} = A \frac{ (1-x)}{(t-t^2)} - \frac{(B*x -C*x^2)}{(t-t^2 )*(t-x)}$
It does indeed not seem to evaluate at all (10.1) and thus the solution obtained in the link you gave (coming from Version 10.0) makes one wonder. Have you checked whether the given solution is correct? If it is then Version 10.1 might have introduced a bug.
Jun
10
comment Solving $\frac{dx}{dt} = A \frac{ (1-x)}{(t-t^2)} - \frac{(B*x -C*x^2)}{(t-t^2 )*(t-x)}$
Welcome! Note that C is an internally predefined symbol so I would advise to use lower case variable names.
Jun
9
comment Mathematica 10 Dataset doesn't format more than 4 columns?
I posted some work around function viewDataset for tabular datasets here.
Jun
6
comment DSolve returns a wrong solution
What about converting the problem into a system of ODE, e.g. there is a (somehwat complicated) solution to DSolve[{ r1'[t] == r2[t], r2'[t] == k/(r1[t]*r1[t])}, { r1[t], r2[t] }, t] ?
Jun
6
comment DSolve returns a wrong solution
What is the other solution, eg. the one previously obtained with Mathematica 9?