Laplace图像变形的余切矩阵的效果，Matlab

clear all;
mesh_source = ‘C:\Users\li\Desktop\101028\101028_l\T_0.obj’;
[v,F] = load_mesh(mesh_source);

cotmatrix(v,F)
结果：非对角矩阵。对角元+其他零散的元素
(5158,5227) 0.20947
(5159,5227) 1.06
(5160,5227) 0.45512
(5226,5227) 0.93866
(5227,5227) -3.7111
(5228,5227) 0.40294
(5160,5228) 0.75533
(5226,5228) 0.517
(5227,5228) 0.40294
(5228,5228) -3.5602
(5229,5228) 0.57263
(5282,5228) 0.84747
(5283,5228) 0.46483
(5160,5229) 0.38974
(5161,5229) 0.7125
(5228,5229) 0.57263
(5229,5229) -3.6208
(5230,5229) 0.77691
(5283,5229) 0.83793
(5284,5229) 0.33109
(5161,5230) 0.65695
(5162,5230) 0.66164
(5229,5230) 0.77691
(5230,5230) -3.7053
(5231,5230) 0.96896
(5284,5230) 0.64081
(5162,5231) 0.5454
(5163,5231) 0.45772
(5230,5231) 0.96896
(5231,5231) -3.69
(5232,5231) 0.5389
(5284,5231) 0.2101
(5285,5231) 0.96889
(5163,5232) 0.58678
(5164,5232) 0.59164
(5231,5232) 0.5389
(5232,5232) -3.5052
(5233,5232) 0.59464
(5285,5232) 0.65113
(5286,5232) 0.54214
(5164,5233) 0.81291
(5165,5233) 0.46077
(5232,5233) 0.59464
(5233,5233) -3.5944
(5234,5233) 0.48949
(5286,5233) 0.36427
(5287,5233) 0.87234
(5165,5234) 0.68205
(5166,5234) 0.25283
(5233,5234) 0.48949
(5234,5234) -3.4672
(5235,5234) 0.60608
(5287,5234) 0.39905
(5288,5234) 0.44333
(5289,5234) 0.59433
(5166,5235) 0.88755
(5234,5235) 0.60608
(5235,5235) -3.733
(5236,5235) 0.61875
(5289,5235) 0.81388
(5290,5235) 0.80671
(5166,5236) 0.29444
(5168,5236) 0.80669
(5169,5236) 0.30211
(5235,5236) 0.61875
(5236,5236) -3.4682
(5237,5236) 0.46959
(5290,5236) 0.36754
(5291,5236) 0.60911
(5169,5237) 0.85625
(5171,5237) 0.31226
(5236,5237) 0.46959
(5237,5237) -3.5684
(5238,5237) 0.76517
(5291,5237) 0.56406
(5292,5237) 0.60105
(5171,5238) 0.68665
(5172,5238) 0.77025
(5237,5238) 0.76517
(5238,5238) -3.6527
(5239,5238) 0.71455
(5292,5238) 0.71604
(5172,5239) 0.52292
(5174,5239) 0.23144
(5175,5239) 0.67708
(5176,5239) 0.5522
(5238,5239) 0.71455
(5239,5239) -3.4738
(5240,5239) 0.37872
(5292,5239) 0.39689
(5176,5240) 0.66149
(5178,5240) 0.72177
(5239,5240) 0.37872
(5240,5240) -3.5375
(5241,5240) 0.38779
(5292,5240) 0.75353
(5293,5240) 0.63419
(5178,5241) 0.59007
(5179,5241) 0.40069
(5240,5241) 0.38779
(5241,5241) -3.4452
(5242,5241) 0.64763
(5293,5241) 0.49687
(5294,5241) 0.64344
(5295,5241) 0.27872
(5179,5242) 0.68568
(5180,5242) 0.91862
(5241,5242) 0.64763
(5242,5242) -3.7122
(5243,5242) 0.51015
(5295,5242) 0.95009
(5180,5243) 0.4629
(5181,5243) 0.5319
(5242,5243) 0.51015
(5243,5243) -3.406
(5244,5243) 0.472
(5295,5243) 0.37639
(5296,5243) 0.65799
(5297,5243) 0.39472
(5181,5244) 0.64392
(5182,5244) 0.57494
(5243,5244) 0.472
(5244,5244) -3.478
(5245,5244) 0.57065
(5297,5244) 0.68201
(5298,5244) 0.53445
(5182,5245) 0.54525
(5183,5245) 0.52635
(5244,5245) 0.57065
(5245,5245) -3.5396
(5246,5245) 0.81656
(5298,5245) 0.70796
(5299,5245) 0.37284
(5183,5246) 0.67305
(5245,5246) 0.81656
(5246,5246) -3.6541
(5247,5246) 0.7246
(5299,5246) 0.64692
(5300,5246) 0.79299
(5183,5247) 0.47841
(5184,5247) 0.64886
(5246,5247) 0.7246
(5247,5247) -3.5206
(5248,5247) 0.54159
(5300,5247) 0.48487
(5301,5247) 0.64227
(5184,5248) 0.40553
(5185,5248) 0.58429
(5186,5248) 0.3671
(5247,5248) 0.54159
(5248,5248) -3.4078
(5249,5248) 0.63223
(5301,5248) 0.48045
(5302,5248) 0.39665
(5186,5249) 0.84924
(5188,5249) 0.64923
(5248,5249) 0.63223
(5249,5249) -3.706
(5250,5249) 0.78493
(5302,5249) 0.79038
(5188,5250) 0.33646
(5249,5250) 0.78493
(5250,5250) -3.6646
(5251,5250) 1.0074
(5252,5250) 0.29517
(5302,5250) 0.47342
(5303,5250) 0.76727
(5188,5251) 0.48102
(5190,5251) 1.0234
(5192,5251) 0.60082
(5250,5251) 1.0074
(5251,5251) -3.7668
(5252,5251) 0.65417
(5192,5252) 0.34036
(5250,5252) 0.29517
(5251,5252) 0.65417
(5252,5252) -3.4918
(5253,5252) 0.5675
(5303,5252) 0.75738
(5304,5252) 0.27125
(5305,5252) 0.60598
(5192,5253) 0.72591
(5193,5253) 0.90065
(5252,5253) 0.5675
(5253,5253) -3.7772
(5254,5253) 0.47676
(5305,5253) 1.1063
(5193,5254) 0.45265
(5194,5254) 0.50467
(5253,5254) 0.47676
(5254,5254) -3.4885
(5255,5254) 0.59355
(5305,5254) 0.41736
(5306,5254) 0.72564
(5307,5254) 0.3179
(5194,5255) 0.68853
(5195,5255) 0.51838
(5196,5255) 0.46745
(5254,5255) 0.59355
(5255,5255) -3.539
(5256,5255) 0.82377
(5307,5255) 0.44734
(5196,5256) 0.57855
(5255,5256) 0.82377
(5256,5256) -3.6768
(5257,5256) 0.40036
(5307,5256) 0.32163
(5308,5256) 0.87375
(5309,5256) 0.67872
(5196,5257) 0.76062
(5197,5257) 0.50998
(5256,5257) 0.40036
(5257,5257) -3.5805
(5258,5257) 0.43925
(5309,5257) 0.80611
(5310,5257) 0.66417
(5197,5258) 0.88462
(5257,5258) 0.43925
(5258,5258) -3.6076
(5259,5258) 0.54593
(5310,5258) 0.5769
(5311,5258) 0.87207
(5312,5258) 0.28883
(5197,5259) 0.35204
(5198,5259) 1.2404
(5199,5259) 0.30549
(5258,5259) 0.54593
(5259,5259) -3.7971
(5260,5259) 0.35107
(5312,5259) 1.0022
(5199,5260) 1.2752
(5200,5260) 0.51841
(5259,5260) 0.35107
(5260,5260) -4.0291
(5261,5260) 0.78407
(5312,5260) 1.1003
(5200,5261) 0.78172
(5201,5261) 0.63775
(5202,5261) -0.28024
(5260,5261) 0.78407
(5261,5261) -3.916
(5262,5261) 0.90898
(5312,5261) -0.17549
(5313,5261) 0.43183
(5314,5261) 0.82743
(5202,5262) 0.9494
(5261,5262) 0.90898
(5262,5262) -4.0591
(5263,5262) 0.40599
(5264,5262) 1.3316
(5314,5262) 0.46312
(5202,5263) 0.94623
(5203,5263) 0.4819
(5204,5263) 0.37466
(5205,5263) 1.0478
(5262,5263) 0.40599
(5263,5263) -3.6859
(5264,5263) 0.42933
(5205,5264) 0.24562
(5262,5264) 1.3316
(5263,5264) 0.42933
(5264,5264) -4.0003
(5265,5264) 1.3127
(5314,52