FILE PERMISSONS

'r'
Open file for reading.
'w'
Open or create new file for writing. Discard existing contents, if any.
'a'
Open or create new file for writing. Append data to the end of the file.
'r+'
Open file for reading and writing.
'w+'
Open or create new file for reading and writing. Discard existing contents, if any.
'a+'
Open or create new file for reading and writing. Append data to the end of the file.
'A'
Open file for appending without automatic flushing of the current output buffer.
'W'
Open file for writing without automatic flushing of the current output buffer.

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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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