Difference between revisions of "ApCoCoA-1:Num.EigenValues"

From ApCoCoAWiki
Line 17: Line 17:
  
 
<example>
 
<example>
 +
Use P::=QQ[x,y,z];
 +
 
A:=Mat([[1,2,7,18],[2,4,9,12],[23,8,9,10],[7,5,3,2]]);
 
A:=Mat([[1,2,7,18],[2,4,9,12],[23,8,9,10],[7,5,3,2]]);
 
Dec(Num.EigenValues(A),3);
 
Dec(Num.EigenValues(A),3);
Line 38: Line 40:
 
     <types>
 
     <types>
 
       <type>cocoaserver</type>
 
       <type>cocoaserver</type>
 +
      <type>matrix</type>
 
     </types>
 
     </types>
 
     <key>Num.EigenValues</key>
 
     <key>Num.EigenValues</key>

Revision as of 15:30, 20 April 2009

Num.EigenValues

Computes the eigenvalues of a matrix.

Syntax

Num.EigenValues(A:MAT):MAT

Description

Please note: The function(s) explained on this page is/are using the ApCoCoAServer. You will have to start the ApCoCoAServer in order to use it/them.

This function computes the approximate complex eigenvalues of the matrix A.

  • @param A A squared matrix with rational entries.

  • @return The return value is a matrix with two rows. Each column represents one approximate complex eigenvalue of A, i.e. the first entry of a column is the real part and the second entry of the same column is the imaginary part of one complex eigenvalue.


Example

Use P::=QQ[x,y,z];

A:=Mat([[1,2,7,18],[2,4,9,12],[23,8,9,10],[7,5,3,2]]);
Dec(Num.EigenValues(A),3);
-- CoCoAServer: computing Cpu Time = 0.015
-------------------------------
Mat([
  ["28.970", "-13.677", "0.353", "0.353"],
  ["0", "0", "3.051", "-3.051"]
])
-------------------------------

See also

Introduction to CoCoAServer

Numerical.QR

Numerical.SVD

Numerical.EigenValuesAndVectors

Numerical.EigenValuesAndAllVectors