Question

I have a simple question about how can I copy a vector into another. I have a vector with a length of 66×1 and then, another with a length of 2151×1. I want to copy the values from the first one in a exactly position on the other. I’ve tried that but it doesn’t work.

inter= 66×1
out= 2151×1

for i=1:numel(inter)
    out(101:167)= inter(i)
end

Also I’ve tried this:

for inter=(1:66);
    out(101:167)=inter;
end 

And this:

for k= (101:167)
    out(k)=inter(1:66);
end

Am I doing wrong? Thanks in advance,

Answer 1

Let’s say your vectors are

a = [1; 2; 3];
b = [4; 5; 6; 7; 8; 9];

for simplicity.

There is no need to use loops. You can just go ahead and do it like this:

startIdx = 2; %101 in your case
finalIdx = startIdx + size(a,1) - 1; % 166 in your case
b(startIdx:finalIdx) = a; 

Then b would be:

b =

     4
     1
     2
     3
     8
     9

---

A very important point here is the -1 in finalIdx. You need to substract 1 from the final index.