离散数据积分问题
试验中掌握了一些离散数据，其中x=[0.00E+00
0.471232142
0.942210605
1.327284063
1.642129344
1.899554643
2.110032295
2.282124775
2.422833019
2.537881225
2.631949706
2.708865291
2.771756995
2.823183308
2.865236263
2.899626536
2.927753015
2.950759686
2.969814103
2.986390011
3.001573309
3.015943418
3.029567056
3.042250739
3.053980228
3.065042556
3.075759512
3.08613643
3.095975888
3.105097821
3.113324727
3.120601295
3.127078113
3.13306417
3.13881663
3.144528394
3.150379946
3.156599685
3.163536448
3.171452529
3.180287908
3.189575934
3.198935407
3.208628012
3.218726861
3.228685628
3.238185195
3.247536557
3.25726925
3.267088565
3.276283337
3.284571985
3.292277754
3.299705351
3.307104608
3.314723576
3.322624778
3.330511799
3.337965237
3.344876275
3.351452552
3.357854218
3.364177142
3.370534193
3.377117974
3.384082895
3.391475725
3.39923975
3.407109313
3.414606967
3.421323489
3.42730748
3.432837274
3.438151642
3.443426654
3.44882377
3.454439901
3.460291519
3.466292115
3.472313244
3.478242392
3.484031222
3.489725877
3.495406681
3.501131151
3.506940321
3.512918506
3.51922936
3.526118011
3.533759617
3.542088454
3.550863301
3.559913911
3.569472933
3.579852922
3.591357187
3.604190238
3.618453521
3.634380842
3.652610287
3.67416663
3.699621854
3.72908862
3.762243335
3.800876306
3.846564228
3.900569516
3.962241436
4.028644489
4.096210176
4.163239681
4.231709758
4.304277597
4.384363172
4.477159088
4.586787328
4.71637449
4.869555885
5.050628955
5.264673982
5.517696769
5.816797363
6.170369524
6.587360907
7.080223723
7.662757491
8
];
y=[-1.49E-32
-1.20E-15
-3.66E-14
-1.04E-12
-3.38E-11
-1.06E-09
-2.59E-08
-4.61E-07
-5.85E-06
-5.27E-05
-3.39E-04
-1.59E-03
-5.63E-03
-1.60E-02
-3.91E-02
-8.51E-02
-0.167968366
-0.302334857
-0.501093236
-0.785152652
-1.189694627
-1.76450204
-2.560462994
-3.610969355
-4.94314103
-6.614760848
-8.720275305
-11.31978364
-14.39566174
-17.86794286
-21.583711
-25.38619567
-29.21886904
-33.16975049
-37.3674356
-41.9573581
-47.13512305
-53.21948662
-60.79385734
-70.59795583
-83.25774332
-98.92555536
-117.7116175
-141.0508791
-170.505073
-205.7889921
-246.330649
-293.8622102
-352.4406936
-422.0632148
-497.7552348
-575.232833
-655.3387118
-739.9142701
-831.1490036
-931.9249157
-1042.986858
-1159.410178
-1273.243114
-1380.74864
-1483.443126
-1582.433476
-1677.883649
-1770.07774
-1859.979517
-1947.074834
-2028.411144
-2099.231538
-2153.580202
-2187.392367
-2201.878434
-2201.846744
-2190.93855
-2170.749003
-2141.579285
-2102.745838
-2053.289751
-1992.766038
-1922.202767
-1843.936193
-1760.807235
-1675.066682
-1587.471147
-1497.988343
-1406.762416
-1314.131168
-1219.750873
-1122.177352
-1019.170717
-910.3405256
-799.3478745
-691.885364
-591.7303766
-497.8528515
-409.3862953
-326.6832303
-251.515325
-186.0860107
-131.3967489
-87.1418131
-52.93921917
-29.02577597
-14.31705439
-6.394260393
-2.492396318
-0.825245409
-0.229960957
-5.59E-02
-1.28E-02
-2.92E-03
-6.91E-04
-1.62E-04
-3.62E-05
-7.27E-06
-1.23E-06
-1.69E-07
-1.88E-08
-1.67E-09
-1.20E-10
-7.80E-12
-6.34E-13
-7.64E-14
-1.23E-14
-5.22E-15
-5.53E-15
-6.62E-15
-3.90E-15]
想用Y对X积分， 我想先拟合出一条合适的曲线再做积分，而不是利用梯形法来做。但是不知道该怎么来找一个合适的曲线，利用多项式得出的结果都比较奇怪。请大家不吝赐教啊。