fast and beautiful way to convert vector ranges to indexes

1 min readMar 18, 2023

Hi there,

my question could easily be solved with a simple loop but I’m curious if there is a nice genuine matlab way of doing this: I have a vector “v1” containing 10 entries. First 5 belong together, next 2 belong together and the last 3 again (somehow). So I got a vector “v2” with

v2 = [5; 2; 3];

I want now something like

v3 = [1 1 1 1 1 2 2 3 3 3];

So I could access my v1 vector with:

v1(v3==1);

(Background for the question are different colors for each group with the plot-command.)

Thanks already in advance — I’m sure Matlab holds a nice and short way of doing this :-)

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c=cumsum(v2);
v3=zeros(1,c(end));
 v3([1,c(1:end-1)])=1;

v3=cumsum(v3);
 v3(end)=[],

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