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1d
comment Evaluating the cumulative multivariate hypergeometric distribution
If you draw 6 marbles and you want the probability of at least two of each, this can only happen by having exactly two of each.
1d
comment Dynamical system problem x(t+1) = Ax(t)
How about Normalize[{-1, 1}]//N
1d
comment Manipulate axis scale on a ListPlot
Replace ListPlot with ListLogLinearPlot
1d
comment Dynamical system problem x(t+1) = Ax(t)
The eigenvectors are correct... all eigenvector calculations are only right up to a constant multiple. Mathematica deals with this by choosing the vector that has unit norm... so {0.707107, 0.707107} points in the same direction as {1,1} and {-0.707107, 0.707107} points in the direction {-1,1}.
2d
comment Plotting 2 arrays against each other on mathematica
First, you would have to actually define etastore and phistore. In your code, they are not assigned anything. For instance, you would need to use etastore[[i]] instead of etastore[i].
2d
comment Dynamical system problem x(t+1) = Ax(t)
"Better" might depend on context, but for stability (i..e, the states $a(t)$ and $b(t)$ converging to zero) you will need Abs[r+s]<1. You can see that happening in Bob Hanlon's simulations.
2d
answered Dynamical system problem x(t+1) = Ax(t)
May
2
comment How to Simplify Complex numbers Sqrt[1 - i] Sqrt[i + 1]
The imaginary number is I not i... so Simplify[Sqrt[1 - I] Sqrt[I + 1]] gives Sqrt[2].
May
1
answered Applying a window over a list
Apr
30
comment unordered lists with maximum dispersion
I have no idea what your question is. Can you clarify what you wish help with?
Apr
29
comment Plotting logistic maps
The reason the lostic function doesn't do anything is because it's a function and you have to call it. For example: logistic[3.5, 0.1]
Apr
28
comment How to calculate Probability of “Ranking”?
Is this a probability course? If so, the answer is that you are in second place -- if you can figure out the answer.
Apr
28
comment How to find roots using the bisection method
How about: FindRoot[f[x], {x, 0.1}]. Then scan through many different starting values.
Apr
27
comment How to use Mathematica to help me get highest score in every layout?
There are at least two questions here, both fairly complicated. One is about how to program the game and the other is about how to program a strategy for the game. Clearly the first must be answered before the second can be attempted. How about if you do the first part -- then others might be more interested in attempting the second.
Apr
27
comment Periodic boundary condition trick
Have you seen this... mathematica.stackexchange.com/q/32689/1783
Apr
27
revised Need help extracting data
added 32 characters in body
Apr
27
revised Need help extracting data
deleted 950 characters in body
Apr
27
answered Need help extracting data
Apr
26
answered portions of plot missing for a relatively simple function
Apr
25
comment Use Map on a Function with two variables
Why is the Thread needed? Just using f[{1, 2, 3, 4, 5}, {1, 2, 3, 4, 5}] also gives {2, 4, 6, 8, 10}.