## flow redirection in an array

on 12 May 2016

### Ano (view profile)

on 12 May 2016
Dear all, I would like to perform a flow redirection for a dam of water once a condition is verified, here I am given an example to clarify the idea and the result that I would like to obtain, so you can help me figure out what is the proper way to do it. such each column is a 'door' where the flow can pass, and the rows are the time, once the flow is =10, the flow must be redirected to a new door (create a new column) and the flow at the old door must be reduced to 0, the new door is closed if the flow at the old door is below 10, otherwise it must continue within the new door, such the newData matrix must be as follow:
data= 2 1 3 4
2 1 10 4
2 1 10 4
1 3 10 10
1 2 10 10
1 2 10 4
newData= 2 1 3 4 0 0
2 1 0 4 3 0
2 1 0 4 3 0
1 3 0 0 3 4
1 2 0 0 3 4
1 2 0 4 3 0
any suggestions?! thank you!

Guillaume

### Guillaume (view profile)

on 12 May 2016
Why do the new columns receive 3 and 4 respectively?
Ano

### Ano (view profile)

on 12 May 2016
they receive the previous value that comes directly before the flow reach its limit in this case 10.

### Andrei Bobrov (view profile)

on 12 May 2016

data= [2 1 3 4
2 1 10 4
2 1 10 4
1 3 10 10
1 2 10 10
1 2 10 4]
t = data >= 10;
ii = any(t);
t0 = t(:,ii);
[m,n] = size(t0);
d = data(:,ii);
k = cumsum(t0).*t0;
v = d([k(2:end,:);zeros(1,n)] == 1);
newData = [data(:,~ii),reshape(bsxfun(@times,v(:)',cat(3,~t0,t0)),m,[])]