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Loop for extracting a matrix

Asked by Meddour Aissam riad on 14 Jun 2019
Latest activity Edited by dpb
on 14 Jun 2019
Hi everyone,
I have an array/matrix of two column : acceleration (speed) , it contain 150 values. for each 10 valuies I want my program to calculates the average speed and acceleration of all 10 values ​​(from 0 to 10, then from 10 to 20 ...)
can you help me with a program

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dpb
on 14 Jun 2019
"...calculates the average speed and acceleration of all 10 values ​​(from 0 to 10, then from 10 to 20 ...)"
NB: each of those ranges is acutally 11 elements, not 10...

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2 Answers

Guillaume
Answer by Guillaume
on 14 Jun 2019

Reshape your array into a 3D array with rows of 10 elements, columns of 150/10 = 15 elements, and 2 pages. Take the mean across the rows to get a 1x15x2 array which is the mean across ten consecutive values. Squeeze that back into a 15x2 array:
squeeze(mean(reshape(yourarray, 10, [], 2), 1)) %will error if the number of rows is not a multiple of 10

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dpb
Answer by dpb
on 14 Jun 2019
Edited by dpb
on 14 Jun 2019

nAvg=10;
mnAV=reshape(mean(reshape(av,nAvg,[])),[],2);
Same caveat w/ Guillaume; errors if not divisible by nAvg and the final reshape is based on the input array being specifically two columns. That limitation can be removed by using size(av,2) in place of the hardcoded '2', of course.

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