Curve fit

[cunninghands]

I need help curve fitting my data, I do not know how since I am very new to
Octave.

The xdata = A
the ydata = Binding Energy per nucleon

xdata
*******
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ydata
******
0.1863999999999795
 1.351399999999955
 3.075600000000006
 2.795999999999968
 7.316199999999919
 5.141533333333215
 5.576466666666639
 5.858285714285661
 5.417249999999791
 5.60531428571423
 6.710399999999996
 6.756999999999815
 6.719720000000066
 7.176399999999981
 6.881266666666495
 6.253719999999994
 6.913745454545446
 7.922000000000025
 7.714092307692285
 7.775542857142828
 7.35658666666663
 6.399733333333319
 7.477507692307713
 7.715628571428565
 7.946853333333355
 7.624925000000027
 7.543717647058772
 7.282914285714223
 7.698319999999939
 8.219074999999988
 7.998752941176527
 8.015200000000084
 7.818989473684112
 7.779458823529395
 7.875399999999857
 8.025010526315734
 7.969531999999935
 7.9930095238095
 7.575088888888893
 7.804273684210636
 8.276160000000081
 8.219352380952303
 8.328690909090914
 8.205652173913066
 8.248199999999816
 8.159236363636312
 8.355582608695613
 8.310333333333281
 8.140817391304379
 8.504500000000046
 8.470015999999994
 8.581569230769098
 8.577851851851726
 8.690899999999967
 8.693310344827536
 8.76701333333332
 8.596146666666611
 8.724722580645121
 8.734587499999924
 8.7410303030303
 8.829329411764677
 8.787428571428526
 8.825522222222165
 8.763462857142963
 8.768566666666741
 8.818735135135254
 15.75338888888887
 8.770875675675637
 8.861357894736841
 8.810984615384541
 8.844679999999915
 8.80142564102559
 32.08409999999989
 8.824448780487751
 8.793420000000035
 8.790351219512139
 8.862876190476189
 8.847497674418621
 8.906954545454482
 8.88092444444435
 8.92086086956523
 8.893659574468
 8.921958333333166
 8.86642666666668
 8.902626086956504
 8.907540425531867
 8.972441666666656
 8.960514285714284
 9.006847999999936
 8.867591666666625
 8.94347199999995
 8.991058823529233
 8.815166666666679
 8.947200000000073
 9.024269230769148
 9.008747169811254
 9.028318518518509
 8.985170370370399
 9.014981818181758
 8.981718518518434
 9.038735714285639
 9.019143859649017
 9.042006896551603
 9.005647457627063
 8.985765517241331
 9.016705084745738
 8.996906666666669
 8.977731034482785
 9.027973333333373
 9.01289836065574
 9.044909677419369
 9.028750000000066
 9.000457142857083
 8.987974999999954
 9.007421538461431
 8.983606249999912
 8.973009230769408
 9.009333333333206
 8.984758208955386
 9.007505882352788
 8.98314857142859
 8.97421449275363
 8.969515492957782
 8.96983428571424
 8.98214999999999
 8.956136986301317
 8.977427027026867
 8.959463157894508
 8.930827027026929
 8.952170666666641
 8.935864864864934
 8.961915789473537
 8.945989610389532
 8.969902564102503
 8.964674999999925
 8.948336585365714
 8.938941772151729
 8.92972500000009
 8.948350617283738
 8.908964102564056
 8.942540000000019
 8.933392592592375
 8.961975609756088
 8.948322891566036
 8.970499999999944
 8.966706976744156
 8.949392941176415
 8.964340229885021
 8.9272285714285
 8.95912093023243
 8.956841379310363
 8.985327272727101
 8.96500224719099
 8.960662222222124
 8.945151648351542
 8.945173913043433
 8.920429787234001
 8.889920833333205
 8.915131182795571
 8.906678260869539
 8.912497872340401
 8.900109473684102
 8.905454166666642
 8.887628865979218
 8.888236734693773
 8.858659999999915
 8.865296969696811
 8.857883333333247
 8.870167346938747
 8.85964848484854
 8.870775999999921
 8.853077227722661
 8.860396078431272
 8.841453846153808
 8.835902912621243
 8.830243137254708
 8.836076923076833
 8.822045714285682
 8.832018867924468
 8.820344444444398
 8.801469090909046
 8.805222429906475
 8.793592592592395
 8.800132110091768
 8.788056603773564
 8.800496296296204
 8.803163636363529
 8.789347747747668
 8.797414285714241
 8.780594690265476
 8.785326315789387
 8.767227586206902
 8.775646017699057
 8.768904347826036
 8.762464285714263
 8.772245614035032
 8.76890434782592
 8.773655172413783
 8.762393162393003
 8.767118644067793
 8.756100840335984
 8.7608
 8.747049180327839
 8.726225806451623
 8.734611570247937
 8.728975609756105
 8.729733333333296
 8.731770491803175
 8.721398373983712
 8.726225806451517
 8.716063999999976
 8.720857142857053
 8.703559055118163
 8.708374999999986
 8.689107692307614
 8.703559055118163
 8.679694656488543
 8.68864516129026
 8.69866666666668
 8.701093750000053
 8.684217054263552
 8.689107692307614
 8.679694656488543
 8.684545454545583
 8.673164179104377
 8.655264705882194
 8.668300751879661
 8.660430769230757
 8.663363636363663
 8.666208955223945
 8.650340740740644
 8.65526470588239
 8.646510948905018
 8.651391304347673
 8.631130434782552
 8.636086330935136
 8.627852941176377
 8.631130434782552
 8.634314285714266
 8.604591549295634
 8.606127659574419
 8.5980281690141
 8.583524475524339
 8.582166666666625
 8.561544827586166
 8.560356164383434
 8.532837837837775
 8.506053333333332
 8.540163265306175
 8.556277777777613
 8.533823129251724
 8.532837837837775
 8.519355704697952
 8.518479999999881
 8.498368421052604
 8.484831168831089
 8.492927152317909
 8.485464052287586
 8.48610526315781
 8.478779220779284
 8.466167741935406
 8.471641025640894
 8.459235668789708
 8.458784810126566
 8.440424999999905
 8.446616352201106
 8.447743589743514
 8.446987341772081
 8.440424999999905
 8.04819627329174
 8.428271604938292
 8.416588957055263
 8.41641463414631
 8.404945454545452
 8.41101234567895
 8.40504878048772
 8.399228915662544
 8.38800000000008
 8.388000000000002
 8.371552941176398
 8.371455621301779
 8.365809523809579
 8.360588235293992
 8.355298245613966
 8.355488372093033
 8.344901734104081
 8.339793103448212
 8.31915909090908
 8.324091428571366
 8.313863636363449
 8.323724137930894
 8.31915909090908
 8.309016949152408
 8.304224719101041
 8.294279329608882
 8.289622222222217
 8.284444444444416
 8.279867403314791
 8.279266666666613
 8.275340659340586
 8.265770491803231
 8.261369565217391
 8.247698924730972
 8.246940540540399
 8.233497326203143
 8.241108695652077
 8.237677419354865
 13.21247058823535
 8.229361702127642
 8.220338624338632
 8.221221052631519
 8.208395833333208
 8.202575916230284
 8.194839378238218
 8.201599999999846
 8.198687499999828
 8.191030927834975
 8.182482051281864
 8.18353061224478
 8.171474747474701
 8.170375634517651
 8.169265306122263
 8.166767676767607
 8.163195979899474
 8.164319999999911
 8.156159203980035
 8.152693069306912
 8.145862745097849
 8.144669950738791
 8.137951219512159
 8.136725490195975
 8.134640776699037
 8.126859903381673
 8.123634615384562
 8.095085714285641
 8.035233644859808
 8.107062200956991
 8.062679245282908
 8.090647619047527
 8.043943925233558
 8.01692592592582
 7.99040366972477
 7.986128440366951
 8.019436363636368
 7.951387387387292
 7.940807174887797
 7.921999999999968
 7.907629955947203
 7.901561403508742
 7.889582608695664
 7.873793103448194
 7.86399999999992
 7.86399999999992
 7.869775862068864
 7.860000000000015
 7.858273504273557
 7.84862978723387
 7.828016806722782




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