Delsq

  
The eigenvectors take 7200 bytes
The Laplacian matrix takes 1180 bytes
  
A =

Compressed Column Sparse (rows = 30, cols = 30, nnz = 88 [9.8%])

  (1, 1) ->  2
  (2, 1) -> -1
  (1, 2) -> -1
  (2, 2) ->  2
  (3, 2) -> -1
  (2, 3) -> -1
  (3, 3) ->  2
  (4, 3) -> -1
  (3, 4) -> -1
  (4, 4) ->  2
  (5, 4) -> -1
  (4, 5) -> -1
  (5, 5) ->  2
  (6, 5) -> -1
  (5, 6) -> -1
  (6, 6) ->  2
  (7, 6) -> -1
  (6, 7) -> -1
  (7, 7) ->  2
  (8, 7) -> -1
  (7, 8) -> -1
  (8, 8) ->  2
  (9, 8) -> -1
  (8, 9) -> -1
  (9, 9) ->  2
  (10, 9) -> -1
  (9, 10) -> -1
  (10, 10) ->  2
  (11, 10) -> -1
  (10, 11) -> -1
  (11, 11) ->  2
  (12, 11) -> -1
  (11, 12) -> -1
  (12, 12) ->  2
  (13, 12) -> -1
  (12, 13) -> -1
  (13, 13) ->  2
  (14, 13) -> -1
  (13, 14) -> -1
  (14, 14) ->  2
  (15, 14) -> -1
  (14, 15) -> -1
  (15, 15) ->  2
  (16, 15) -> -1
  (15, 16) -> -1
  (16, 16) ->  2
  (17, 16) -> -1
  (16, 17) -> -1
  (17, 17) ->  2
  (18, 17) -> -1
  (17, 18) -> -1
  (18, 18) ->  2
  (19, 18) -> -1
  (18, 19) -> -1
  (19, 19) ->  2
  (20, 19) -> -1
  (19, 20) -> -1
  (20, 20) ->  2
  (21, 20) -> -1
  (20, 21) -> -1
  (21, 21) ->  2
  (22, 21) -> -1
  (21, 22) -> -1
  (22, 22) ->  2
  (23, 22) -> -1
  (22, 23) -> -1
  (23, 23) ->  2
  (24, 23) -> -1
  (23, 24) -> -1
  (24, 24) ->  2
  (25, 24) -> -1
  (24, 25) -> -1
  (25, 25) ->  2
  (26, 25) -> -1
  (25, 26) -> -1
  (26, 26) ->  2
  (27, 26) -> -1
  (26, 27) -> -1
  (27, 27) ->  2
  (28, 27) -> -1
  (27, 28) -> -1
  (28, 28) ->  2
  (29, 28) -> -1
  (28, 29) -> -1
  (29, 29) ->  2
  (30, 29) -> -1
  (29, 30) -> -1
  (30, 30) ->  2



  0 ++---------+-----------+----------+-----------+----------+-----------+++
    + C  C C   +           +          +           +          +           + |
    |    C C C C                                                           |
  5 ++       C C  C                                                       ++
    |          C  C C C                                                    |
    |               C C  C                                                 |
 10 ++                C  C C C                                            ++
    |                      C C C  C                                        |
    |                          C  C C                                      |
 15 ++                            C C C  C                                ++
    |                                 C  C C C                             |
    |                                      C C  C                          |
 20 ++                                       C  C C C                     ++
    |                                             C C C  C                 |
    |                                                 C  C C               |
 25 ++                                                   C C C  C         ++
    |                                                        C  C C        |
    |                                                           C C C C    |
 30 ++         +           +          +           +          +      C C  C++
    +----------+-----------+----------+-----------+----------+-----------+-+
    0          5          10         15          20         25          30