convert a data to a function

Hi, i have currently received a data ( table of points (xi, yi)

and i want to convert it even approximatively to a function

is that possible with matlab ?

need help!

[madhan ravi]

Are you talking about fitting ?

[JEDIDI Ran]

i have number of point (x,y) like that , and i want to turn it as function y=f(x) (get it expression) the closet function to the plot

2.07E+00 0.45

2.07E+00 1.37

2.07E+00 2.33

2.07E+00 3.36

2.07E+00 4.45

2.07E+00 5.59

2.07E+00 6.8

2.08E+00 8.07

2.08E+00 9.4

2.08E+00 10.8

2.08E+00 12.29

2.08E+00 13.8

Answer 1

[madhan ravi]

https://www.mathworks.com/help/matlab/ref/polyfit.html

[JEDIDI Ran]

thanks !

[JEDIDI Ran]

i have used polyfit function to do so and i have got that plot the red one is the polyfit function , the blue is the one i have it data , as you see they are close to each other but

P(t)= =2.995134969444502*(10^3)*(t^10)+(2.454194242827056*(10^3))*(t^9)-(3.074449680687996*(10^4))*(t^8)-(1.831814183200164*(10^4))*(t^7)+(1.225116448716314*(10^5))*(t^6)+(1.225116448716314*(10^5))*(t^5)-(2.265044070414277*(10^5))*(t^4)+(6.259310423328208*(10^2))*(t^3)+(1.720638633336634*(10^5))*(t^2)+(8.587517861009773*(10^4))*t+(2.102731998692876*(10^5));

so P(t=0)= (2.102731998692876*(10^5)) different from zero

what should i do to make it close ?