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金虫 (小有名气)

应助: 1 (幼儿园)
金币: 489.4
散金: 53
帖子: 101
在线: 248小时
虫号: 1166035
注册: 2010-12-09
性别: GG
专业: 区域环境化学

[求助] 利用matlab进行分段拟合求一个常数a，拐点m，直线y=kx+b，数据如下

x=[3.00221124
2.80819715
2.77570885
2.700689847
2.472327868
2.427454075
2.373975089
2.283402274
2.263844265
2.211565695
2.190535589
2.186051277
2.159868791
2.159868791
2.152924318
2.148267733
2.107786015
2.089391873
2.079441542
2.066862759
2.059238834
2.054123734
2.05284086
2.051556338
2.047692843
2.02287119
2.020222182
2.009555414
2.002830439
2.002830439
1.993338843
1.986503546
1.983756292
1.979621206
1.974081026
1.962907725
1.962907725
1.962907725
1.962907725
1.961502244
1.953027617
1.948763218
1.932969638
1.932969638
1.932969638
1.919859472
1.912501087
1.906575144
1.900613874
1.894616855
1.894616855
1.880990603
1.867176109
1.867176109
1.867176109
1.867176109
1.867176109
1.865629318
1.864080131
1.83736998
1.834180185
1.830980182
1.814824742
1.803358605
1.800058272
1.800058272
1.798404012
1.798404012
1.780024213
1.780024213
1.780024213
1.780024213
1.780024213
1.778336449
1.766441661
1.763017
1.757857918
1.743968805
1.743968805
1.728109442
1.728109442
1.726331664
1.726331664
1.726331664
1.726331664
1.726331664
1.710187816
1.70837786
1.706564623
1.706564623
1.706564623
1.706564623
1.688249093
1.688249093
1.688249093
1.688249093
1.688249093
1.688249093
1.680827909
1.648658626
1.638996715
1.62924054
1.611435915
1.609437912
1.60341984
1.595338988
1.595338988
1.591273942
1.589235205
1.589235205
1.589235205
1.589235205
1.589235205
1.589235205
1.589235205
1.587192303
1.58514522
1.568615918
1.568615918
1.566530411
1.560247668
1.560247668
1.558144618
1.553925203
1.545432582
1.54329811
1.523880024
1.523880024
1.521698998
1.521698998
1.521698998
1.521698998
1.512927012
1.506297154
1.501852702
1.477048724
1.477048724
1.477048724
1.456286733
1.451613827
1.435084525
1.427916036
1.427916036
1.425515074
1.40854497
1.40854497
1.383791231
1.371180723
1.358409158
1.358409158
1.353254507
1.332366019
1.327075001
1.327075001
1.324418957
1.280933845
1.272565596
1.272565596
1.272565596
1.272565596
1.252762968
1.252762968
1.232560261
1.226712291
1.223775432
1.214912744
1.214912744
1.196948189
1.193922468
1.184789985
1.153731588
1.153731588
1.153731588
1.153731588
1.134622726
1.134622726
1.134622726
1.134622726
1.088561953
1.088561953
1.088561953
1.068153081
1.068153081
1.043804052
1.01884732
1.01884732
1.00063188
1.00063188
1.00063188
0.928219303
0.891998039
0.867100488
0.850150929
0.850150929
0.850150929
0.722705983
0.693147181
0.672944473
0.587786665
0.570979547
]
y=[0
0.693147181
1.098612289
1.386294361
1.609437912
1.791759469
1.945910149
2.079441542
2.197224577
2.302585093
2.397895273
2.48490665
2.564949357
2.63905733
2.708050201
2.772588722
2.833213344
2.890371758
2.944438979
2.995732274
3.044522438
3.091042453
3.135494216
3.17805383
3.218875825
3.258096538
3.295836866
3.33220451
3.36729583
3.401197382
3.433987204
3.465735903
3.496507561
3.526360525
3.555348061
3.583518938
3.610917913
3.63758616
3.663561646
3.688879454
3.713572067
3.737669618
3.761200116
3.784189634
3.80666249
3.828641396
3.850147602
3.871201011
3.891820298
3.912023005
3.931825633
3.951243719
3.970291914
3.988984047
4.007333185
4.025351691
4.043051268
4.060443011
4.077537444
4.094344562
4.110873864
4.127134385
4.143134726
4.158883083
4.17438727
4.189654742
4.204692619
4.219507705
4.234106505
4.248495242
4.262679877
4.276666119
4.290459441
4.304065093
4.317488114
4.33073334
4.343805422
4.356708827
4.369447852
4.382026635
4.394449155
4.406719247
4.418840608
4.430816799
4.442651256
4.454347296
4.465908119
4.477336814
4.48863637
4.49980967
4.510859507
4.521788577
4.532599493
4.543294782
4.553876892
4.564348191
4.574710979
4.584967479
4.59511985
4.605170186
4.615120517
4.624972813
4.634728988
4.644390899
4.65396035
4.663439094
4.672828834
4.682131227
4.691347882
4.700480366
4.709530201
4.718498871
4.727387819
4.736198448
4.744932128
4.753590191
4.762173935
4.770684624
4.779123493
4.787491743
4.795790546
4.804021045
4.812184355
4.820281566
4.828313737
4.836281907
4.844187086
4.852030264
4.859812404
4.86753445
4.875197323
4.882801923
4.890349128
4.8978398
4.905274778
4.912654886
4.919980926
4.927253685
4.934473933
4.941642423
4.94875989
4.955827058
4.96284463
4.9698133
4.976733742
4.983606622
4.990432587
4.997212274
5.003946306
5.010635294
5.017279837
5.023880521
5.030437921
5.036952602
5.043425117
5.049856007
5.056245805
5.062595033
5.068904202
5.075173815
5.081404365
5.087596335
5.093750201
5.099866428
5.105945474
5.111987788
5.117993812
5.123963979
5.129898715
5.135798437
5.141663557
5.147494477
5.153291594
5.159055299
5.164785974
5.170483995
5.176149733
5.18178355
5.187385806
5.192956851
5.198497031
5.204006687
5.209486153
5.214935758
5.220355825
5.225746674
5.231108617
5.236441963
5.241747015
5.247024072
5.252273428
5.257495372
5.262690189
5.267858159
5.272999559
5.278114659
5.283203729
5.288267031
5.293304825
5.298317367
]

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