How to retrive a function from an array data.

Hi team, I have written the following code:

np=1000;

time=0;

Fs=1/0.8e-9;

tme=time(1)+[0:np-1]'/Fs;

X=50e-6*sin(2*pi*12e6*tme+39.2/180*pi);

Then, X is an array of data representing sine signal 50e-6*sin(2*pi*12e6*tme+39.2/180*pi) sampled at Fs=1/0.8e-9 frequency.

My question is if I was given of X array in matlab or .csv, can I use matlab to find the math function (in this case, it is a sine function)?

Thanks!