File: empty.cat

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scilab 2.6-4
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matrices          Scilab Group          Scilab Function            matrices
NAME
   empty ([]) - empty matrix
  
DESCRIPTION
    []  denotes the empty matrix. It is uniquely defined and has 0 row and 0
  column, i.e.  size([]) =[0,0] . The following convenient conventions are
  made:
  
    [] * A = A * [] = [] 
  
    [] + A = A + [] = A 
  
   [ [], A] = [A, []] = A  inv([]) =[] 
  
    det([])=cond([])=rcond([])=1, rank([])=0 
  
   Matrix functions return [] or an error message when there is no obvious
  answer. Empty linear systems  ( syslin  lists) may have several rows or
  columns.
  
EXAMPLE
 s=poly(0,'s'); A = [s, s+1]; 
 A+[], A*[]
 A=rand(2,2); AA=A([],1), size(AA)
 svd([])
 w=ssrand(2,2,2); wr=[]*w; size(wr), w1=ss2tf(wr), size(w1)
SEE ALSO
   matrices, poly, string, boolean, rational, syslin