http://www.mathworks.com/matlabcentral/newsreader/view_thread/238507 Feed for thread: Matrix inversion en-us &copy;1994-2012 by MathWorks, Inc. webmaster@mathworks.com MATLAB Central Newsreader http://blogs.law.harvard.edu/tech/rss 60 http://www.mathworks.com/images/membrane_icon.gif Fri, 31 Oct 2008 21:26:02 -0400 http://www.mathworks.com/matlabcentral/newsreader/view_thread/238507#608439 Katula 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? Sat, 01 Nov 2008 02:56:03 -0400 http://www.mathworks.com/matlabcentral/newsreader/view_thread/238507#608455 Roger Stafford "Katula " &lt;ssengendo_ronald@yahoo.co.uk&gt; wrote in message &lt;geft5a$bbp$1@fred.mathworks.com&gt;...<br> &gt; 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?<br> <br> &nbsp;&nbsp;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.<br> <br> &nbsp;&nbsp;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.<br> <br> Roger Stafford