Is it no longer possible to calculate SVD in sage?
 
  
 
  
 
 
 
 
 
 
    
        
        asked 2 years ago  
 
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I recently noticed that the property .SVD() is no longer available for matrices defined over the RDF ring. 
 
Is it no longer possible to calculate singular value decomposition in sage?
 
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For me, m = matrix(RDF,4,range(1,17)); m.SVD() works in the latest Sage. Can you provide more details? What version of Sage, what is not working for you, etc.?
John Palmieri gravatar imageJohn Palmieri (
    
        2 years ago
    )
Thanks for the reply. Yes, your mwe works.
I think my issue is that my matrix was originally defined as a "sparse" matrix over RDF and therefore I guess does not have the SVD method. Running A=matrix(RDF, A.nrows(), A.ncols(), A._list()) fixes the issue. Thanks!
more_weight gravatar imagemore_weight (
    
        2 years ago
    )
1
That makes sense. I think you could also do A.dense_matrix().SVD().
John Palmieri gravatar imageJohn Palmieri (
    
        2 years ago
    )
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