Approximately, yes. You can choose as many points ##(x_i,y_i)## you like - the more the better - say ##n+1## many, then set ##p(x)=a_0x^n+a_1x^{n-1}+\ldots +a_{n-1}x+a_n## and solve ##p(x_i)=y_i## for the coefficients ##a_i##. That doesn't give you the correct answer in case your function is defined otherwise and you only drew a certain part of the graph, but it is a good approximation for what you have drawn.is it possible to draw a random curve on a piece of graph paper and find the function that defines that curve? Assuming smooth curves.
How do you sketch a four dimensional graph, ##(Re(x_i)+i\cdot Im(x_i)\; , \;Re(y_i)+i\cdot Im(y_i))\,?##And if so,is it possible to do so with complex curves?