06 May 2024 02:00:37 PM

ppc_image_analysis_test():
  C version
  Test ppc_image_analysis().

clip_matrix_test():
  clip matrix() forces the entries of a matrix to be
  integers within a given range.

  Random matrix:

 214.248 100.568 199.69 203.602 232.47
 50.3756 85.4818 195.899 70.8326 141.262
 121.736 160.362 93.02 130.917 242.819
 233.63 162.106 182.911 36.1087 154.777
 4.15665 61.9361 34.9941 205.065 39.9532
 102.241 33.0966 27.7462 254.726 55.6555

  After clipping:

 214 101 200 204 232
 50 85 196 71 141
 122 160 93 131 243
 234 162 183 36 155
 4 62 35 205 40
 102 33 28 255 56

prune_pgm_test():
  prune pgm() drops small matrix elements
  whose norm is less than some percentage of the matrix norm.

  Random matrix:

 0.512932 0.839112 0.61264 0.296032 0.637552
 0.524287 0.493583 0.972775 0.292517 0.771358
 0.526745 0.769914 0.400229 0.891529 0.283315
 0.352458 0.807725 0.919026 0.0697553 0.949327
 0.525995 0.0860558 0.192214 0.663227 0.890233

  Matrix Frobenius norm: 3.15725

  min matrix = 0.0697553
  max matrix = 0.972775
  norm^2 = 9.96825
  rel_err = 0.1
  abs_err2 = 0.996825
min = 0.0697553, max = 0.521265, e = 1.09382
min = 0.29551, max = 0.521265, e = 0.215051
min = 0.408388, max = 0.521265, e = 0.587095
min = 0.464826, max = 0.521265, e = 0.587095
min = 0.493046, max = 0.521265, e = 0.587095
min = 0.507155, max = 0.521265, e = 0.83072
min = 0.507155, max = 0.51421, e = 1.09382
min = 0.510683, max = 0.51421, e = 0.83072
min = 0.512447, max = 0.51421, e = 0.83072

  Pruned matrix:

 0.512932 0.839112 0.61264 0 0.637552
 0.524287 0 0.972775 0 0.771358
 0.526745 0.769914 0 0.891529 0
 0 0.807725 0.919026 0 0.949327
 0.525995 0 0 0.663227 0.890233
  Number of elements deleted was 9

  Matrix Frobenius norm after pruning: 3.02283
  Ratio norm_new - norm_old / norm_old = 0.0833366

truncation_error_test():
  truncation_error() measures error in neglecting matrix
  elements smaller than a given threshold.

  Random matrix:

 0.348893 0.0641713 0.020023 0.457702 0.0630958
 0.23828 0.970634 0.902208 0.85092 0.266666
 0.53976 0.375207 0.760249 0.512535 0.667724
 0.531606 0.0392803 0.437638 0.931835 0.93081
 0.720952 0.284293 0.738534 0.639979 0.354049

  Threshold    Truncation error:

  For threshold t = 0.5, truncation error = 1.00763
  For threshold t = 0.25, truncation error = 0.0668202
  For threshold t = 0.125, truncation error = 0.0100429
  For threshold t = 0.0625, truncation error = 0.00194387

ppc_image_analysis_test():
  Normal end of execution.
06 May 2024 02:00:37 PM