How to code this? Resampling of vector

Question

Lucas 2014-2-5

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评论： Lucas 2014-2-5

Hi all,

Currently I am trying to resample a signal by changing its signal frequency; The signal is given by time vector t and signal vector s. Example:

t=[ 1 2 3 4 5 6 7 8 9 10 11 12]

s=[3 3.5 3 5.5 2 2.5 3 5 7 2.5 3.5 4 ]

I want to create a vector s_new in which the sum of the values of s on the interval <0,4] is one element, the sum of interval <4,8] is an element etc, creating:

s_new= [15 12.5 17]

I have been toying around with histc but didnt succeed. Any ideas on coding this?

Thanks in advance! Lucas

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Azzi Abdelmalek 2014-2-5

Lucas commented

Thanks guys, but I actually want to use any resampling frequency, so the reshape command doesnt necessarily work (works only if old and new sampling times are integer multiples of each other). Thanks anyway!

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Answer 1

Mischa Kim 2014-2-5

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https://ww2.mathworks.cn/matlabcentral/answers/114933-how-to-code-this-resampling-of-vector#answer_123344

编辑：Mischa Kim 2014-2-5

在 MATLAB Online 中打开

For these straightforward time values, this will do

sum(reshape(s,4,3))

If t gets more complex you should be able to find a similar solution, though.

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Answer 2

David Sanchez 2014-2-5

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在 MATLAB Online 中打开

s_new(1) = sum(s(find(s<4)))
s_new(2) = sum(s(find( (s<8)&(s>=4) )))
s_new(3) =sum(s(find( (s<12)&(s>=8) )))
...

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Answer 3

Azzi Abdelmalek 2014-2-5

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https://ww2.mathworks.cn/matlabcentral/answers/114933-how-to-code-this-resampling-of-vector#answer_123357

编辑：Azzi Abdelmalek 2014-2-5

在 MATLAB Online 中打开

t=[ 1 2.5 2.8  3 3.1  4 5 6 7 8 9 10 11 12];
s=[3 3.5 3.5 4 3 5.5 2 2.5 3 5 7 2.5 3.5 4 ]
ii=hist(t,[2 6 10]) % 2 is the middle of the interval [0,4];
ii2=cumsum(ii);
ii1=[1 ii2(1:end-1)+1]; 
out=arrayfun(@(ii,jj) sum(s(ii:jj)),ii1,ii2)