bill s
Reputation
34,488
443/400 score
 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}.