Pencocokan Kurva

>> x=[1 1.3 1.5 1.9 2 3 3.5 4.1 5 6]
x =

  Columns 1 through 9

    1.0000    1.3000    1.5000    1.9000    2.0000    3.0000    3.5000    4.1000    5.0000

  Column 10

    6.0000

>> y=[4.4 6.4 7.4 7.8 7.4 -20.8 -62.2 -151.6 -406 -940.6]
y =

  Columns 1 through 9

    4.4000    6.4000    7.4000    7.8000    7.4000  -20.8000  -62.2000 -151.6000 -406.0000

  Column 10

 -940.6000

>> plot(x,y)
>> plot(x,y,':o')
>> A=linspace(1,6)

A =

  Columns 1 through 9

    1.0000    1.0505    1.1010    1.1515    1.2020    1.2525    1.3030    1.3535    1.4040

  Columns 10 through 18

    1.4545    1.5051    1.5556    1.6061    1.6566    1.7071    1.7576    1.8081    1.8586

  Columns 19 through 27

    1.9091    1.9596    2.0101    2.0606    2.1111    2.1616    2.2121    2.2626    2.3131

  Columns 28 through 36

    2.3636    2.4141    2.4646    2.5152    2.5657    2.6162    2.6667    2.7172    2.7677

  Columns 37 through 45

    2.8182    2.8687    2.9192    2.9697    3.0202    3.0707    3.1212    3.1717    3.2222

  Columns 46 through 54

    3.2727    3.3232    3.3737    3.4242    3.4747    3.5253    3.5758    3.6263    3.6768

  Columns 55 through 63

    3.7273    3.7778    3.8283    3.8788    3.9293    3.9798    4.0303    4.0808    4.1313

  Columns 64 through 72

    4.1818    4.2323    4.2828    4.3333    4.3838    4.4343    4.4848    4.5354    4.5859

  Columns 73 through 81

    4.6364    4.6869    4.7374    4.7879    4.8384    4.8889    4.9394    4.9899    5.0404

  Columns 82 through 90

    5.0909    5.1414    5.1919    5.2424    5.2929    5.3434    5.3939    5.4444    5.4949

  Columns 91 through 99

    5.5455    5.5960    5.6465    5.6970    5.7475    5.7980    5.8485    5.8990    5.9495

  Column 100

    6.0000

>> p=polyfit(x,y,2)

p =

  -65.2291  286.3546 -265.7766

>> B=polyval(p,A)

B =

  Columns 1 through 9

  -44.6512  -36.9440  -29.5696  -22.5280  -15.8191   -9.4430   -3.3997    2.3109    7.6887

  Columns 10 through 18

   12.7337   17.4459   21.8254   25.8722   29.5861   32.9673   36.0157   38.7314   41.1143

  Columns 19 through 27

   43.1644   44.8817   46.2663   47.3181   48.0372   48.4234   48.4769   48.1977   47.5857

  Columns 28 through 36

   46.6409   45.3633   43.7530   41.8099   39.5340   36.9254   33.9840   30.7098   27.1029

  Columns 37 through 45

   23.1632   18.8907   14.2855    9.3475    4.0767   -1.5268   -7.4631  -13.7322  -20.3341

  Columns 46 through 54

  -27.2687  -34.5360  -42.1362  -50.0691  -58.3348  -66.9332  -75.8645  -85.1284  -94.7252

  Columns 55 through 63

 -104.6547 -114.9170 -125.5121 -136.4399 -147.7005 -159.2938 -171.2200 -183.4788 -196.0705

  Columns 64 through 72

 -208.9949 -222.2521 -235.8421 -249.7648 -264.0203 -278.6086 -293.5296 -308.7834 -324.3700

  Columns 73 through 81

 -340.2893 -356.5415 -373.1263 -390.0440 -407.2944 -424.8776 -442.7935 -461.0422 -479.6237

  Columns 82 through 90

 -498.5379 -517.7850 -537.3647 -557.2773 -577.5226 -598.1007 -619.0115 -640.2552 -661.8316

  Columns 91 through 99

 -683.7407 -705.9826 -728.5573 -751.4648 -774.7050 -798.2780 -822.1838 -846.4223 -870.9936

  Column 100

 -895.8977

>> plot(x,y,':ok',A,B,':r')
>> grid on

>> plot(x,y,':ok',A,B,':r','LineWidth',2)
>> xlabel('Nilai x')
>> ylabel('Nilai y')
>> title('Grafik Pencocokan Kurva Kuadrat Terkecil')
>> grid
>> gtext('{\leftarrow} Pencocokan Kurva Kuadrat Terkecil')