MATLAB: How can i find deleted rows from matrix?

MATLAB

 x0 = [2     3     2     2     2;
     2     3     2     2     2;
     2     4     1     2     2;
     2     4     1     2     2;
     2     3     2     2     2;
     2     3     2     2     2];
 x0(any(x0<2,2),:) = [];
 x0 = [2     3     2     2     2;
     2     3     2     2     2;
     2     3     2     2     2;
     2     3     2     2     2];

I want to see deleted row separately i.e

     2     4     1     2     2;
     2     4     1     2     2;

I want to know index of x0 which deleted.

Best Answer

use k = x0(any(x0<2,2),:) ;

k will be your matrix which you are going to delete.

Related Solutions

MATLAB: Is it possible to find corresponding row from other matrix’s row?

It is easy, you just need to assign the logical conditions to an index variable. So instead of this:

x0(any(x0<2,2),:) = [];

you should allocate that logical condition to a variable:

idx = any(x0<2,2);

and then you can use idx for any of the matrices:

>> xdel = x0(idx,:)
xdel =
   2   4   1   2   2
   2   4   1   2   2
>> xnew = x0(~idx,:)
xnew =
   2   3   2   2   2
   2   3   2   2   2
   2   3   2   2   2
   2   3   2   2   2

and now you can try x00(idx,:) and x00(~idx,:) yourself!

MATLAB: Equations instead of plain values (roots)

They are not ‘equations’. They are symbolic quantities. To convert them to double values, use the double function:

F = double(roots(E))

The imaginary parts are negligible in this example, so consider using:

F = real(double(roots(E)))

Best Answer

Related Solutions

MATLAB: Is it possible to find corresponding row from other matrix’s row?

MATLAB: Equations instead of plain values (roots)

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