Vincent asked . 2023-03-18

fast and beautiful way to convert vector ranges to indexes

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 :-)

indexing , Creating and Concatenating Matrices , Language Fundamentals

Expert Answer

Kshitij Singh answered . 2025-03-28 22:33:04

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

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

Summary:

The cumsum(v2) creates a cumulative sum vector c.
A zero vector v3 is created with a length of the last value in c.
Positions in v3 at 1 and c(1:end-1) are set to 1.
Another cumulative sum is calculated over this v3.
The last element of v3 is removed.

The result is a vector v3 that mirrors the cumulative structure of v2 but adjusted for the specific indexing manipulation.

This process transforms a cumulative indexing approach into a sequential one, useful in various signal processing or data transformation scenarios.

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