Discover MakerZone

MATLAB and Simulink resources for Arduino, LEGO, and Raspberry Pi

Learn more

Discover what MATLAB® can do for your career.

Opportunities for recent engineering grads.

Apply Today

Thread Subject:
Matrix inversion

Subject: Matrix inversion

From: Katula

Date: 31 Oct, 2008 21:26:02

Message: 1 of 2

Am trying to learn MATLAB,i formed a matrix which has large values,zeros and ones,when i try to get the inverse it says matrix is singular.Question is how can i combine very small values with very large values to form one matrix?

Subject: Matrix inversion

From: Roger Stafford

Date: 1 Nov, 2008 02:56:03

Message: 2 of 2

"Katula " <ssengendo_ronald@yahoo.co.uk> wrote in message <geft5a$bbp$1@fred.mathworks.com>...
> Am trying to learn MATLAB,i formed a matrix which has large values,zeros and ones,when i try to get the inverse it says matrix is singular.Question is how can i combine very small values with very large values to form one matrix?

  There is no reason why a non-singular matrix cannot have both very small and very large values at the same time. It all depends on what those values are.

  When Matlab declares that it deems a matrix to be "singular" it means that within computable accuracy the matrix has a zero value for its determinant, which in turn means that it can possess no inverse. If it does in fact have an inverse in a mathematical sense, Matlab is unable to determine that inverse with any reasonable accuracy because of inherent round-off errors.

Roger Stafford

Tags for this Thread

No tags are associated with this thread.

What are tags?

A tag is like a keyword or category label associated with each thread. Tags make it easier for you to find threads of interest.

Anyone can tag a thread. Tags are public and visible to everyone.

Contact us