surface plot 

[X,Y] = meshgrid(1:0.5:10,1:20);
Z = sin(X) + cos(Y);
surf(X,Y,Z)
































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POLYFIT




















Resim







   x = linspace(0,4*pi,10); y = sin(x);      Use  polyfit  to fit a 7th-degree polynomial to the points.     p = polyfit(x,y,7);      Evaluate the polynomial on a finer grid and plot the results.     x1 = linspace(0,4*pi); y1 = polyval(p,x1); figure plot(x,y, 'o' ) hold on  plot(x1,y1) hold off         








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XLSREAD





















 [num,text]=xlsread("iks.xlsx")   num =        1       2       3       4       5       6    text =     7×2 cell array       {'Harfler'}    {'numaralar'}      {'a'      }    {0×0 char   }      {'b'      }    {0×0 char   }      {'c'      }    {0×0 char   }      {'d'      }    {0×0 char   }      {'e'      }    {0×0 char   }      {'f'      }    {0×0 char   }   XLSX DOSYASI      Harfler    numaralar      a    1      b    2      c    3      d    4      e    5      f    6    








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POLYVAL





















 polyval     p ( x ) = 3 x 2 + 2 x + 1  at the points  x = 5 , 7 , 9   p = [3 2 1]; x = [5 7 9]; y = polyval(p,x)  y = 1×3       86   162   262        I =  3 − 1 ( 3 x 4 − 4 x 2 + 1 0 x − 2 5 ) d x .      Create a vector to represent the polynomial integrand  3 x 4 − 4 x 2 + 1 0 x − 2 5 . The  x 3  term is absent and thus has a coefficient of 0.     p = [3 0 -4 10 -25];      Use  polyint  to integrate the polynomial using a constant of integration equal to  0 .     q = polyint(p)        q = 1×6       0.6000         0   -1.3333    5.0000  -25.0000         0       Find the value of the integral by evaluating  q  at the limits of integration.     a = -1; b = 3; I = diff(polyval(q,[a b]))            








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