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I need to make groups from array

조회 수: 3(최근 30일)
zhoug zho
zhoug zho 2021년 6월 30일
편집: zhoug zho 2021년 7월 1일
I have this array, I need to make groups of these 14 elements with the rule that if value of a new element is 1 to 5 percent higher than the value of previous elements then the new element will be part of previous group, otherwise new group will start if it is higher than 5%. Thanks
  댓글 수: 5
zhoug zho
zhoug zho 2021년 6월 30일
can you give an example based on our discussion, . then i will try to adjust the loop according to my need.

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채택된 답변

Walter Roberson
Walter Roberson 2021년 6월 30일
A = [.06, .18, .15, .14, .13, .12, .125, .15, .105, .115, .34, .32, .03 .14]
A = 1×14
0.0600 0.1800 0.1500 0.1400 0.1300 0.1200 0.1250 0.1500 0.1050 0.1150 0.3400 0.3200 0.0300 0.1400
mask = A(2:end) > 1.05 * A(1:end-1);
group_lengths = diff([0, find(mask), length(A)])
group_lengths = 1×6
1 6 2 1 3 1
mat2cell(A, 1, group_lengths)
ans = 1×6 cell array
{[0.0600]} {[0.1800 0.1500 0.1400 0.1300 0.1200 0.1250]} {[0.1500 0.1050]} {[0.1150]} {[0.3400 0.3200 0.0300]} {[0.1400]}
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zhoug zho
zhoug zho 2021년 7월 1일
got it... Thank you so much.

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추가 답변(1개)

David Hill
David Hill 2021년 6월 30일
Some guessing. You only said it stays in group is greater by 1-5%, I assumed a new group otherwise. Anyways, you modify the below to meet your needs.
n{1}=yourArray(1);
c=1;
for k=2:length(yourArray)
if yourArray(k)<=1.05*yourArray(k-1)&&yourArray(k)>=1.01*yourArray(k-1)
n{c}=[n{c},yourArray(k)];
else
c=c+1;
n{c}=yourArray(k);
end
end
  댓글 수: 2
Walter Roberson
Walter Roberson 2021년 6월 30일
However, if it is lower it needs to stay with the group being built according to https://www.mathworks.com/matlabcentral/answers/868868-i-need-to-make-groups-from-array#comment_1613113 and that means that you should not be testing against a lower bound. The 1% is a red herring; the only question is more than 5% increase (new group) otherwise continue the same group.

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