finding al points of a vector in my array and assigning them a different number.

Hi, I have specific timespoints along my timeline that I want to assign a diiferent number. So let's say I have a timeline from 1 to 2000 and I have a vector with a different amount of time points that are somewhere on my timeline (so between 1 and 2000). I want to create a new vector, called indicator, where all the specific time points are assigned a value of 1 and where all the other time points in my timeline are assigned 0. Here is what I have:

counter = 0;

for ii = 1:length(timeline)

if ii == specific_time_points

counter = counter + 1;

indicator (counter) = ii;

indicator = 1;

else indicator = 0;

end

end

But, 'indicator' now only has one value of 0, instead I want it to give a vector of length 2000 with 1's were my specific_time_points are and zeros for the rest of my timeline.

I don't know what I am doing wrong, I hope someone can help me.

[Lois Slangen]

I should mention however that I have two different vectors, lets say specific_time_points1 and specific_time_points2 that have the same timeline. And my new vector indicator should contain a 1 where specific_time_points1 and/or specific_time_points2 are in the timeline and zero every where else.

Answer 1

[Andrey Kiselnikov]

Hi here it is

a = 1:1:10;
b = [1 3 5];

>> ismember(a,b)

ans =

  1×10 logical array

   1   0   1   0   1   0   0   0   0   0

If my help was useful please mark answer as accepted!

[Andrei Bobrov]

indicator  = ismember(timeline,specific_time_points);

[Lois Slangen]

Yes that work, however I have two different vectors, lets say specific_time_points1 and specific_time_points2 that have the same timeline. And my new vector indicator should contain a 1 where specific_time_points1 and/or specific_time_points2 are in the timeline and zero every where else.

[Lois Slangen]

I am sorry I didn't include that in my original question

[Andrey Kiselnikov]

indicator_1 = ismember(timeline,specific_time_points1);
indicator_2 = ismember(timeline,specific_time_points2);
indicator = indicator_1 | indicator_2;

it was for better understanding, in one line it looks like

indicator = ismember(timeline,specific_time_points1) | ismember(timeline,specific_time_points2);

[Andrei Bobrov]

indicator  = ismember(timeline,...
    [specific_time_points1(:);specific_time_points2(:)]);