How to calculate matrixA^100 manually

  • Context: Undergrad 
  • Thread starter Thread starter promisedhl
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Discussion Overview

The discussion revolves around methods for calculating the 100th power of a 3x3 matrix manually, focusing on theoretical approaches and techniques rather than computational tools like MATLAB.

Discussion Character

  • Homework-related
  • Mathematical reasoning
  • Exploratory

Main Points Raised

  • One participant suggests using the property that (A^50)^2 can simplify the calculation.
  • Another participant proposes checking if the matrix is diagonalizable or using Jordan form to express it as a sum of a diagonal matrix and a nilpotent matrix.
  • A different approach mentioned involves using the minimal polynomial to express A^100 in terms of the identity matrix I, the matrix A, and A squared.
  • One participant reports successfully calculating A^100 by finding the eigenvalues of the matrix.

Areas of Agreement / Disagreement

Participants present multiple competing methods for calculating the matrix power, and there is no consensus on a single approach as the best or most effective.

Contextual Notes

The discussion does not clarify specific properties of the matrix in question, which may influence the applicability of the proposed methods.

promisedhl
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hi guys...my teacher wants me to calculate A^100 of a 3*3 matrix by hand...i can't use MATLAB for this...how do i do it...i can't imagine multiplying 100 time...
help me
 
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(A^50)^2

But most likely this is a specific matrix, with interesting properties that make it easy to calculate power no matter how high.
 
Check if the matrix is diagonalizable or, if it isn't, use the Jordan form to write it as a sum of a diagonal plus nilpotent matrix.
 
thanks guys...will try all
 
Yet another way is to use the minimal polynomial to express A^100 in terms of I, A, A^2.
 
i actually did it by finding the eigen values of the matrix...
anyways thank u guys for responding
 

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