Solve Quartic Equation using root and deleting complex numbers from row

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Chris Parry
Chris Parry on 25 Jun 2013
I have a 4x5 matrix, each row being the coeffecients of a quartic equation. I use the roots function to obtain a 4x4 matrix with the roots solution. Each row has two complex numbers, not always in the same column as another row. What is the best way to delete the complex numbers and keep the solutions on the same row, just reducing the cloumn size. For example taking: [1,2,1i,2i;3,4,3i,4i;5i,6i,5,6;7i,8i,7,8] and getting[1,2;3,4;5,6;7,8]

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Accepted Answer

Walter Roberson
Walter Roberson on 25 Jun 2013
reshape(YourMatrix(imag(YourMatrix == 0)), 2, []) .'
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Richard Brown
Richard Brown on 25 Jun 2013
Edited: Richard Brown on 25 Jun 2013
You need to work with the transpose
At = YourMatrix.';
reshape(At(imag(At) == 0), 2, []).'
edit: Looks like Matt and I were writing the same comment at the same time

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