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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
10
awarded  Necromancer
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
9
answered Show More Rows of Dataset
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?
May
26
comment Listing elements starting from 0
It may simply be a matter of (bad?) taste to not use zero as a cardinal number: Does non-machine-communication - there are still some non STEM-hominides around - really gain from a "zeroth" position indicator? Again I would be totally indifferent with regard to a subscript or index value of zero which will be easily implemented. Just a very personal opinion.
May
22
revised Bug in Solve (Mathematica 9)
The issue seems to have been fixed.
May
22
revised Wrong Limit in Mathematica 10.0.0
The title is misleading since it seems to only occur in the earliest release of Version 10.
May
22
suggested approved edit on Wrong Limit in Mathematica 10.0.0
May
22
suggested approved edit on Bug in Solve (Mathematica 9)
May
22
comment ODE fitting to dataset
Just a minor advice but it really pays out to not use symbols in one's code that start with capital letters. By doing so there is complete safety as of not interfering with Mathematica's definitions. Eg. variables C or D or N already demonstrate the case.
May
21
comment How to eliminate variables when using Solve[]
As I had posted with another question for Reduce (cf. Mr.Wizard's entry below). The feature is still documented and can be found here‌​.
May
21
comment Behavior of Reduce with variables as domain
@Mr. Wizard - probably. There is of course also Reduce[ Eliminate[x + y == 1 && x y == 2, y] , x].
May
21
comment Behavior of Reduce with variables as domain
It seems to still be documented as can be seen here‌​? Isn't Reduce a sepecial instance of Solve, eg. with the option Method->Reduce?
May
20
comment Problem using NDSolveValue
You may try the option SolveDelayed -> True and take a look at this.
May
20
answered Plot ParametricNDSolve
May
20
comment Plot ParametricNDSolve
Set ´a[0] ==b[0] == 1` then use something like f = a[3] /. sol where 3 is the parameter value for w. You can then do Plot[ Evaluate@Abs[ f[t] ]^2 , {t,0,100},PlotRange -> All ]. Seems to work out fine.
May
20
comment Evaluation problems with NDSolve using the fixed step ExplicitEuler-Method
@Michael E2 - That is a nice idea, albeit it does get cumbersome. I probably will go for your Mod[t, 1] solution and adapt the EventSeries accordingly as stated. After all a model is a model and not 'reality' - some compromise has to be made eventually.
May
20
comment Plot ParametricNDSolve
Won't you need initial conditions, eg. a[0] == somevalue and b[0] == somevalue?