Multiply x sequentially with items of a vector

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Christoph Meier
Christoph Meier 2015-8-7
评论： Torsten 2015-8-7
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.

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采纳的回答

Torsten
Torsten 2015-8-7
编辑：Torsten 2015-8-7
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.
  2 个评论
Stephen23
Stephen23 2015-8-7
编辑：Stephen23 2015-8-7
See Walter Roberson's answer for the simpler and faster way to do this.
Torsten
Torsten 2015-8-7
And cumprod.m works without a loop ?
Best wishes
Torsten.

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更多回答（1 个）

Walter Roberson
Walter Roberson 2015-8-7
编辑：Stephen23 2015-8-7
cumprod([100, 1.1, 1.2, 1.3, 1.4])

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