# Revision history [back]

### Can I get a exact solution for SVD?

Here's an example.

 A=matrix(RDF,2,2,[1/2,-1/2,-1/2,1/2]) A.SVD()

 <result> ( [-0.707106781187 0.707106781187] [ 0.707106781187 0.707106781187], [ 1.0 0.0] [ 0.0 7.85046229342e-17], [-0.707106781187 0.707106781187] [ 0.707106781187 0.707106781187] ) The exact solution is -1/sqrt(2),1/sqrt(2), 1/sqrt(2), 1/sqrt(2) and D=(1, 0),(0, 0) Something like this... http://www.wolframalpha.com/input/?i=SVD+%7B%7B1%2F2%2C+-1%2F2%7D%2C%7B-1%2F2%2C+1%2F2%7D%7D Is there a way to get the exact solution? One more question... Why doesn't the next code work? A=matrix(RR,2,2,[1/2,-1/2,-1/2,1/2]) A.SVD() 

### Can I get a exact solution for SVD?

Here's an example.

 A=matrix(RDF,2,2,[1/2,-1/2,-1/2,1/2]) A.SVD()

 <result> ( [-0.707106781187 0.707106781187] [ 0.707106781187 0.707106781187], [ 1.0 0.0] [ 0.0 7.85046229342e-17], [-0.707106781187 0.707106781187] [ 0.707106781187 0.707106781187] ) The exact solution is -1/sqrt(2),1/sqrt(2), 1/sqrt(2), 1/sqrt(2) and D=(1, 0),(0, 0) Something like this... http://www.wolframalpha.com/input/?i=SVD+%7B%7B1%2F2%2C+-1%2F2%7D%2C%7B-1%2F2%2C+1%2F2%7D%7D Is there a way to get the exact solution? One more question... Why doesn't the next code work? A=matrix(RR,2,2,[1/2,-1/2,-1/2,1/2]) A.SVD()