find the relatonship between two variables

Hello all,

I would like to create the command in order to create the variable following relationship between two variables such as: if i = [ 1 4 7 10 ] then j = [1 2 3 4]. ex if i =1 then j =1 , if i = 7 then j = 3 and so on.

Thanks you for your helping.

Answer 1

[Walter Roberson]

ivals = [1 4 7 10 ];
jvals = [1 2 3 4];

j = jvals(find(i == ivals));

In the particular case where the ivals are strictly increasing then you could also use

j = interp1(ivals, jvals, i);

[Nam]

Great !!! Thanks you so much :)