creating a sequence matrix
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From: burcu on 11 May 2010 12:37 Dear all, I'm trying to create a statistics matrix with Matlab but couldn't find a way. Here is the problem. I have a column matrix of 1x1000. 1000 lines includes recurrent 5 different data. So i want to create a 5x5 matrix from this data like: aa bb cc dd ee bb ba bc bd be ca cb cc cd ce da db dc dd de ea eb ec ed ee And this matrix will include the transition rates from one integer to another. To be more clear, first line of the first column will count the number of transition from a to a, second column of second line will count transition number from b to a etc. And my 1x1000 matrix is like the transpose of the matrix below: [a , a, a, b, a, c, d, a, b, e .....]' I need to find how many times from one state to another state transition has been occurred in my dataset to find transition probablity briefly. Thanks in advance Burcu
From: us on 11 May 2010 12:58 "burcu " <burcu102(a)hotmail.com> wrote in message <hsc13g$k8q$1(a)fred.mathworks.com>... > Dear all, > > I'm trying to create a statistics matrix with Matlab but couldn't find a way. Here is the problem. I have a column matrix of 1x1000. 1000 lines includes recurrent 5 different data. So i want to create a 5x5 matrix from this data like: > > aa bb cc dd ee > bb ba bc bd be > ca cb cc cd ce > da db dc dd de > ea eb ec ed ee > > And this matrix will include the transition rates from one integer to another. To be more clear, first line of the first column will count the number of transition from a to a, second column of second line will count transition number from b to a etc. And my 1x1000 matrix is like the transpose of the matrix below: > > [a , a, a, b, a, c, d, a, b, e .....]' > > I need to find how many times from one state to another state transition has been occurred in my dataset to find transition probablity briefly. > > Thanks in advance > Burcu a hint: help accumarray; us
From: burcu on 11 May 2010 13:27 Hi Us, Thank you very much for the hint but this function doesnt seem to be creating a matrix for transition numbers from one variable to another, rather it's counting the occurrence, making some other functions. tried to apply this to my problem but no luck. Burcu > > a hint: > > help accumarray; > > us
From: us on 11 May 2010 14:33 "burcu " <burcu102(a)hotmail.com> wrote in message <hsc41v$192$1(a)fred.mathworks.com>... > Hi Us, > > Thank you very much for the hint but this function doesnt seem to be creating a matrix for transition numbers from one variable to another, rather it's counting the occurrence, making some other functions. > tried to apply this to my problem but no luck. > > Burcu > > > > > a hint: > > > > help accumarray; > > > > us well... ACCUMARRAY typically is used (by most CSSMers) to create transition matrices... and, unless i completely misunderstood what you need... one of the solutions v=[2,3,4,3,5,2,3,5,2,3,4,2,1].'; % <- note: col vec tm=accumarray([v(1:end-1),v(2:end)],1) %{ % tm = 0 0 0 0 0 % <- eg, no transition 1-> 1 0 3 0 0 % <- eg, transition 2->3 occurs three times... 0 0 0 2 2 0 1 1 0 0 0 2 0 0 0 %} us
From: burcu on 11 May 2010 15:03
This is exactly what i need:) i have taken v in a different way, now it works. Thank you very much! Burcu > > well... ACCUMARRAY typically is used (by most CSSMers) to create transition matrices... and, unless i completely misunderstood what you need... > > one of the solutions > > v=[2,3,4,3,5,2,3,5,2,3,4,2,1].'; % <- note: col vec > tm=accumarray([v(1:end-1),v(2:end)],1) > %{ > % tm = > 0 0 0 0 0 % <- eg, no transition 1-> > 1 0 3 0 0 % <- eg, transition 2->3 occurs three times... > 0 0 0 2 2 > 0 1 1 0 0 > 0 2 0 0 0 > %} > > us |