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20150510 01:23:31 +0100  commented answer  Can I use the block_matrix command to create arbitrary sizes of block matrix arrays? Some basic things about matrices don't seem to work, like, Z = matrix([[1,0],[2,3]]) Z.charpoly(y) 
20150509 23:42:06 +0100  commented answer  Can I use the block_matrix command to create arbitrary sizes of block matrix arrays? Thats a very generic description. Is there something specific which helps? 
20150509 20:40:56 +0100  asked a question  Can I use the block_matrix command to create arbitrary sizes of block matrix arrays? Like say I want to create a $4k \times 4k$ size matrix by putting together certain $4\times 4$ matrices into a $k \times k$ array.

20150509 20:25:54 +0100  commented answer  How to build a matrix thought of as an array of smaller matrices? (3) And why is "d={}" different from starting as "d=[]" ? 
20150509 20:19:49 +0100  commented answer  How to build a matrix thought of as an array of smaller matrices? (2) Can you explain this " m = [[matrix(2, 2, 0)]*4 for _ in range(4)]" ? What exactly is this doing? Is m not defined as a matrix at this step? 
20150509 20:04:06 +0100  commented answer  How to build a matrix thought of as an array of smaller matrices? (1) Why does $d[0,2]$ make sense? $d$ is not a matrix but just an empty list. If assigning matrices to $d$'s tuple coordinates make sense then why not just read the data and list and assign the appropriate matrices to d's corresponding positions? 
20150508 19:38:32 +0100  asked a question  How to build a matrix thought of as an array of smaller matrices? Say I am given a data set which looks like $[ (0,2,A), (0,3,B), (1,2,C), (1,4,D) ]$ where $A,B,C,D$ are matrices all of the same dimension say $k$. (the data set will always have unique pairs of integers  as in if (1,2,) tuple occurs then (2,1,) tuple will not occur) Now I want to create a 4x4 matrix say X of dimension $4k$ thought of as a 4x4 array of kdimensional matrices. The arrays in $X$ are to be defined as $X(0,2) = A, X(2,0) = A^{1}, X(0,3) = B, X(3,0) = B^{1}, X(1,2) = C, X(2,1) = C^{1}, X(1,4) = D, X(4,1) = D^{1}$ and all other array positions in $X$ are to be filled in with $0$ matrices of dimension $k$.
[I showed this above example with just $4$ tuples. I want to eventually do it with much larger data sets] 
20150508 18:55:48 +0100  asked a question  How does one install Sage in windows? Can someone help me with the process? I downloaded a .ova and a .vmdk file from the mirror Now what? 
20150508 03:39:01 +0100  commented answer  How can I get Sage to go over all possible maps between two sets? Why is this slightly modified thing not working? def All_Maps(A,B): from itertools import product k = len (A) return product(B,repeat = k) for f in All_Maps ([a,b],[0,1]): print f 
20150508 03:36:43 +0100  commented answer  How can I get Sage to go over all possible maps between two sets? Is that "repeat" a command? 
20150503 00:25:28 +0100  asked a question  How can I get Sage to go over all possible maps between two sets? What I want to do is this : Say I take a graph $K_{n,n}$ and choose an ordering for each edge arbitrarily  say denote each edge as $(i,j)$ where $i$ is in the left partition and $j$ is in the right partition. I have a set of matrices $A = { A_1, A_2,...,A_k }$. I want to iterate over all possible ways in which one could have assigned an A matrix to an edge of this graph.

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20150210 18:52:32 +0100  commented answer  How does one get Sage to make random choices? Thanks! Somehow I got confused! 
20150210 03:46:36 +0100  commented answer  How does one get Sage to make random choices? @tmonteil I don't know in what kind of a course can this be a homework :D I am a researcher who recently started using Python and Sage for my research! Back to the question : I don't understand what you are saying. Roughly I would think that one needs to simulate a coin toss where heads come with probability $f(x)$. How is that equivalent to comparing $f(x)$ to a randomly generated number in the interval $[0,1]$ ? (If the two options are $a$ and $b$ then say I want to choose $a$ with a probability $f(x)$ and $b$ with a probability $1f(x)$ and then I guess you mean that this is equivalent to choosing $a$ if the random number is (greater? or lesser?) then $f(x)$ or else otherwise?) I am not getting you. 
20150209 22:54:11 +0100  asked a question  How does one get Sage to make random choices? Like say in the middle of a code I compute a function value $f(x)$ and I knwo that $0 \leq f(x) \leq 1$. Now I want to write an ifthenelse which will do one option with probability $f(x)$ and the other otion with probability $1f(x)$. How does one make Sage do this? Can somoen kindly show a template example to simulate this? 
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20150120 21:55:47 +0100  asked a question  About roots of a certain polynomial equation Why is Sage hanging up trying to find roots of this equation? 
20150120 21:53:22 +0100  commented answer  How to pick out the largest root of an equation? If some of the roots turned out to be complex then would "max" throw up some kind of an error message which as an user I can catch ? 