I need to make groups from array

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zhoug zho 2021-6-30

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编辑： zhoug zho 2021-7-1

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

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zhoug zho 2021-6-30

Yes I need to compare all adjacent elements to form groups. Like firstly I compare element one and two and then two and three and then three and four, and so on.

zhoug zho 2021-6-30

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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Walter Roberson 2021-6-30

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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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Walter Roberson 2021-7-1

在 MATLAB Online 中打开

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) < 0.95 * A(1:end-1) | A(2:end) > 1.05 * A(1:end-1);
group_lengths = diff([0, find(mask), length(A)])
group_lengths = 1×13
     1     1     1     1     1     2     1     1     1     1     1     1     1
mat2cell(A, 1, group_lengths)
ans = 1×13 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]}

zhoug zho 2021-7-1

编辑：zhoug zho 2021-7-1

got it... Thank you so much.

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更多回答（1 个）

David Hill 2021-6-30

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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

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zhoug zho 2021-6-30

Thanks David,

Walter Roberson 2021-6-30

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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