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  1. a0=4
  2. b=10
  3. n=5
  4. x=linspace(a0,b,n)
  5. B=linspace(x,x,3);
  6. C= ones(5,1)
  7. D=B(:,1)
  8. E=D.^2
  9. A= [C D E]
  10. S= A'*A
  11. y=cos(x)'
  12. t=A'*y;
  13. a=S^(-1)*t
  14.  
  15.  xx=linspace(a0,b,40)
  16.  p=a(1,1)*1+ a(2,1)*x+a(3,1)*x.^2
  17.  
  18.   plot(x,y,'ro')
  19.   hold on
  20.   plot(xx,p,'o')
Success #stdin #stdout #stderr 0.16s 53052KB
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stdin
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Standard input is empty
stdout
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a0 =  4
b =  10
n =  5
x =

    4.0000    5.5000    7.0000    8.5000   10.0000

C =

   1
   1
   1
   1
   1

D =

    4.0000
    5.5000
    7.0000
    8.5000
   10.0000

E =

    16.000
    30.250
    49.000
    72.250
   100.000

A =

     1.0000     4.0000    16.0000
     1.0000     5.5000    30.2500
     1.0000     7.0000    49.0000
     1.0000     8.5000    72.2500
     1.0000    10.0000   100.0000

S =

       5.00000      35.00000     267.50000
      35.00000     267.50000    2187.50000
     267.50000    2187.50000   18792.12500

y =

  -0.65364
   0.70867
   0.75390
  -0.60201
  -0.83907

a =

  -5.83997
   1.93229
  -0.14603

xx =

 Columns 1 through 8:

    4.0000    4.1538    4.3077    4.4615    4.6154    4.7692    4.9231    5.0769

 Columns 9 through 16:

    5.2308    5.3846    5.5385    5.6923    5.8462    6.0000    6.1538    6.3077

 Columns 17 through 24:

    6.4615    6.6154    6.7692    6.9231    7.0769    7.2308    7.3846    7.5385

 Columns 25 through 32:

    7.6923    7.8462    8.0000    8.1538    8.3077    8.4615    8.6154    8.7692

 Columns 33 through 40:

    8.9231    9.0769    9.2308    9.3846    9.5385    9.6923    9.8462   10.0000

p =

  -0.447251   0.370287   0.530697   0.033979  -1.119866
stderr
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error: __plt2vv__: vector lengths must match
error: called from
    __plt__>__plt2vv__ at line 483 column 5
    __plt__>__plt2__ at line 242 column 14
    __plt__ at line 107 column 17
    plot at line 223 column 10
    /home/LddAUk/prog.octave at line 20 column 4
https://ideone.com/kxe7b5
language:
Octave (octave 4.4.1)
created:
3 years ago
visibility:
public

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