finding elements in a vector from another vector

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Paul Rogers 2020-7-18

评论： Star Strider 2020-7-18

I'd like to create a vector y with the positions of the elements of x in m.

i.e.

x=0 (first element of x) has and index of 1 in m. So y(1)=1

x=241 (second element of x) has index of 242 in x. So y(2)=242

m and x are in attached

Star Strider 2020-7-18

Try this:

M = load('m.mat');
X = load('x.mat');
m = M.m;
x = X.x;
[~,y] = ismembertol(x, m, 1E-4)

producing:

I checked that separately for a few values using find, and it appears to produce the correct result.

Paul Rogers 2020-7-18

I think it's best we don't edit comment so people can read different options and figure it out based on their version

Star Strider 2020-7-18

Noted.

MATLAB Language Fundamentals Matrices and Arrays Matrix Indexing

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