  | #### D.3.2.24 jordanmatrix Procedure from library `linalg.lib` (see linalg_lib). Usage: jordanmatrix(list(e,s,m)); ideal e, intvec s, intvec m Assume: ncols(e)==size(s)==size(m) Return:
      matrix J;  Jordan matrix with list(e,s,m)==jordan(J)
Example:
    LIB "linalg.lib";
    ring R=0,x,dp;
    ideal e=ideal(2,3);
    intvec s=1,2;
    intvec m=1,1;
    print(jordanmatrix(list(e,s,m)));
    ==> 2,0,0,
    ==> 0,3,0,
    ==> 0,1,3

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