Multiply x sequentially with items of a vector

Dear MATLAB community,

I would like to construct an index, which should start with 100. I have computed a vector, which then determines the change in the index in each time period. For example, for 4 time periods:[1.1,1.2,1.3,1.4] Basically, the operation should compute and produce the following vector:

1. 100*1.1
2. (100*1.1)*1.2
3. ((100*1.1)*1.2)*1.3
4. (((100*1.1)*1.2)*1.3)*1.4

Thank you very much in advance! I appreciate any help, as I am still a beginner with MATLAB.

Answer 1

[Torsten]

vder(1)=v(1);
for l=2:length(v)
vder(l)=vder(l-1)*v(l);
end
vder=100*vder;

v is the original vector, vder is the vector you are looking for.

Best wishes

Torsten.

[Stephen23]

See Walter Roberson's answer for the simpler and faster way to do this.

[Torsten]

And cumprod.m works without a loop ?

Best wishes

Torsten.

Answer 2

[Walter Roberson]

cumprod([100, 1.1, 1.2, 1.3, 1.4])