Vector where elements equals previous elements + 1

I wish to make a column vector where ecah element eqaul the previous element + 1. I also want to be able to decide by a loop how mane elements the vector should contain. Example: start =1;end=1 should give the vector [1}. start=1;end=3 should give the vector [1 2 3]. I hope someone has an idea about how to solve this.

[Daniel Shub]

This is such a basic thing that I would really suggest you having another read of the manual.

Answer 1

[Andrei Bobrov]

do as wrote Daniel

OR

end1 = 3;
for jj = end1:-1:1
    vector(jj) = jj;
end

[Daniel Shub]

I am not convinced Karl will be able to figure out make that go from A to B ...

[Karl]

Thanks!

Answer 2

[Daniel Shub]

Using end is a bad choice since it is special in MATLAB. I think what you are asking for is

    a:b

[Karl]

It is no problem for me using a term other than end. I just with to make a vector equall to [1 (1+1) (1+1+1) (1+1+1+1)...(1xn)] where I can adjust n...

[Azzi Abdelmalek]

Why this is different from Daniel's answer?

n=5
a=1
b=n
out=a:b

[Karl]

That did the trick. Thanks!

Answer 3

[Azzi Abdelmalek]

   a=[1 1 1)
out=cumsum(a)

[Karl]

This was an example where start =1 and end=3 in mye exemple aboove. However, I need a loop, so that I don't have to write the number of 1's every time as in your line 1. I have lots of different vetor lengths that I vary all the time.

[Daniel Shub]

Azzi, while I agree this works, why would you go this way?

[Azzi Abdelmalek]

I've just misunderstood the question

[Daniel Shub]

Ahh now I see. I can see how the description would lead you to think CUMSUM is the right answer.