Find value of second dependent variable corresponding to new value of independent variable based on defined array

I have set of array with independent variable 'X' and dependent variable 'Y'. I want to find value of 'Y'given new value of 'X'. i.e. X=normrand(0,1,100,1); Y=1+0.2*X; % it can be any unknown relationship. Equation is written just for example Find value of Y for X=[0.001 1.89 -0.45 1.12]? Thanks

Answer 1

[Stephen23]

This is exactly what interp1 does:

X = normrnd(0,1,10,1)
Y = 1+0.2*X
% sort:
[Xs,idx] = sort(X);
Ys = Y(idx);
% interpolate:
Xo = [0.001,1.89,-0.45,1.12];
Yo = interp1(X,Y,Xo)

Note that you will need to explicitly specify the behavior if you want it to extrapolate as well as interpolate. You can also choose the interpolation method. Read the documentation to know more.

[chetan sharma]

Thanks and sorry for the much-delayed reply.