Thread Subject:

random shufflling

I want to shuffle the elements of a matrix in row wise (i.e., not the entire row together) by placing the elemnets randomly, but not to change the column wise (i.e., sum of the column elements should be the same before and after shuffling, but can change the rows). Can anybody please help me in coding. Any command is available.
Eg:-A=[1 0 0 0 0 0
           0 1 0 0 0 0
           0 0 1 0 0 0
           0 0 0 1 0 0
           0 0 0 0 1 0
           0 0 0 0 0 1 ]
After shuffling may be some what like this,
     B= [0 0 1 0 0 0
           0 1 0 0 0 0
           0 0 0 1 0 0
           1 0 0 0 0 0
           0 0 0 0 0 1
           0 0 0 0 1 0 ]
I would like to generate matrix of size F*NDx NP* ND, where F=1, ---,5. and NP=1,....10. Here, ND =6. Iin each row, from column 1 to 6 , 7 to 12, 13 to 18, ----, only one one can be placed.

Thanks in advance---
Kind regards,
Shibu

"SHIBU A" wrote in message <ig7is8$1um$1@fred.mathworks.com>...
> I want to shuffle the elements of a matrix in row wise (i.e., not the entire row together) by placing the elemnets randomly, but not to change the column wise (i.e., sum of the column elements should be the same before and after shuffling, but can change the rows). Can anybody please help me in coding. Any command is available.
> Eg:-A=[1 0 0 0 0 0
> 0 1 0 0 0 0
> 0 0 1 0 0 0
> 0 0 0 1 0 0
> 0 0 0 0 1 0
> 0 0 0 0 0 1 ]
> After shuffling may be some what like this,
> B= [0 0 1 0 0 0
> 0 1 0 0 0 0
> 0 0 0 1 0 0
> 1 0 0 0 0 0
> 0 0 0 0 0 1
> 0 0 0 0 1 0 ]

One way would be with a FOR-loop:
%%%
A = eye(10);
for ii = 1:size(A,2);
    A(:,ii) = A(randperm(size(A,1)),ii);
end
%%%
Expand upon it as you need

"SHIBU A" wrote in message <ig7is8$1um$1@fred.mathworks.com>...
> I want to shuffle the elements of a matrix in row wise (i.e., not the entire row together) by placing the elemnets randomly, but not to change the column wise (i.e., sum of the column elements should be the same before and after shuffling, but can change the rows). Can anybody please help me in coding. Any command is available.
> Eg:-A=[1 0 0 0 0 0
> 0 1 0 0 0 0
> 0 0 1 0 0 0
> 0 0 0 1 0 0
> 0 0 0 0 1 0
> 0 0 0 0 0 1 ]
> After shuffling may be some what like this,
> B= [0 0 1 0 0 0
> 0 1 0 0 0 0
> 0 0 0 1 0 0
> 1 0 0 0 0 0
> 0 0 0 0 0 1
> 0 0 0 0 1 0 ]
> I would like to generate matrix of size F*NDx NP* ND, where F=1, ---,5. and NP=1,....10. Here, ND =6. Iin each row, from column 1 to 6 , 7 to 12, 13 to 18, ----, only one one can be placed.
>
> Thanks in advance---
> Kind regards,
> Shibu

The functions RANDSWAP and SHAKE do exactly this:
http://www.mathworks.com/matlabcentral/fileexchange/12621-randswap
http://www.mathworks.com/matlabcentral/fileexchange/10067-shake

hth
Jos

Dear SHIBU,

> I want to shuffle the elements of a matrix in row wise...

You can specify the dimension to operate on in Shuffle also:
  http://www.mathworks.com/matlabcentral/fileexchange/27076

Kind regards, Jan