Starting diary file diary-08-Apr-2013.txt

what

M-files in the current directory /Users/gilbert/Documents/CS219spring2013/Matlab

clustereg    jacobi       misseq       
gploth       misluby      startup      

MAT-files in the current directory /Users/gilbert/Documents/CS219spring2013/Matlab

clusters         meshes           oldndmats        
heatproblem      ndmats           

load ndmats

whos
  Name        Size             Bytes  Class     Attributes

  A         100x100             8168  double    sparse    
  invp        1x100              800  double              
  pnd         1x100              800  double              
  xy        100x2               1600  double              

spy(A)
gplotg(A,xy)
gploth(A,xy,1:100)


spy(A)
L = chol(A)';
spy(L)
etreeplotg(A,1)

pnd

n = length(A)
n =
   100
size(pnd)
ans =
     1   100
pinv(pnd) = 1:n;
pinv

reshape(pinv,10,10)
ans =
    78    76    80    74    72    90    54    52    56    50
    77    75    79    73    71    89    53    51    55    49
    85    84    83    82    81    88    60    59    58    57
    68    66    70    64    62    87    46    44    48    42
    67    65    69    63    61    86    45    43    47    41
   100    99    98    97    96    95    94    93    92    91
    29    27    31    25    23    40    10     8    12     6
    28    26    30    24    22    39     9     7    11     5
    36    35    34    33    32    38    16    15    14    13
    20    19    21    18    17    37     3     2     4     1

Ap = A(pnd,pnd);
spy(Ap),shg
etreeplotg(Ap,1)
spy(Ap),shg
L = chol(Ap)';
spy(L)
etreeplotg(Ap,1)

diary off