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Consultant (environmental stats a specialty) and teacher.


Jan
10
reviewed No Action Needed How to obtain a smaller-sized output from Solve
Jan
10
reviewed No Action Needed mysql insert set problem
Jan
10
reviewed No Action Needed System Identification with large Input/Output Data
Jan
10
reviewed Reviewed Function to preserve evaluation on display?
Jan
10
revised Function to preserve evaluation on display?
added 10 characters in body; edited tags
Jan
10
reviewed Reviewed Show does not combine the plots
Jan
10
comment Show does not combine the plots
Show is supposed to overlay all the plots. (If this is not what you want, look at Grid, GraphicsGrid, TableForm, etc.) Is there some problem with how the overlay is occurring?
Jan
10
answered Using NSolve on an equation that involves Mean and TruncatedDistribution
Jan
10
reviewed Close How do I make a frequency heatmap?
Jan
9
awarded  Nice Answer
Jan
9
revised Plotting partial sums and its Cesàro means
deleted 6 characters in body
Jan
9
comment defining recursively a function with multiple if conditions
Lorenzo, did you notice that f[x,n,0] is always $1/2$ for positive $n$? (Its other values tend to be incorrect, too, which becomes obvious when you plot them.) I think the problem is not with Nasser's solution, but with your recurrence: it does not correctly give the probability you are hoping to compute.
Jan
9
revised How to expand a function into a power series with negative powers?
edited title
Jan
9
revised How to expand a function into a power series with negative powers?
added 90 characters in body
Jan
9
revised How to expand a function into a power series with negative powers?
added 112 characters in body; edited tags
Jan
9
answered How to expand a function into a power series with negative powers?
Jan
9
comment Evaluate multivariable function
I changed some "=" to "-" in the first formula but otherwise left it alone, even though it disagrees with your Mathematica input in quite a few places. You might want to check that you typed the correct formula into MMA. In particular, the two of you may disagree sharply about the interpretation of "x-y/2", because it rarely equals $\frac{x-y}{2}$.
Jan
9
revised Evaluate multivariable function
added 78 characters in body
Jan
8
comment RecurrenceTable with vector
Although you say you see the same problem "using MapThread", in MMA 8 this succeeds: RecurrenceTable[{x[n + 1] == MapThread[Times, {{1, 2, 3}, x[n]}], x[0] == {1, 2, 3}}, x, {n, 3}]. (This expression was prompted by @b.gatessucks' answer.)
Jan
8
comment RecurrenceTable with vector
(+1) The truly curious thing about this work-around is if you merely leave List out of the definition of g, the RecurrenceTable expression does not work (it returns an empty list). Tracing the evaluation reveals the problem: {1,2,3}*x[n] is expanded as {x[n], 2 x[n], 3 x[n]}, because MMA does not (yet) know that x[n] is a list at the time of expansion.