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

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chetan sharma 2016-9-13

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评论： chetan sharma 2017-7-28

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

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Answer 1

Stephen23 2016-9-13

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编辑：Stephen23 2016-9-13

在 MATLAB Online 中打开

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.