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Having trouble with a short code in Octave... Complete beginner, So any help Welcome

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Hi, I have a short code to do as part of an assignment. I've almost got it working, but I cannot seem to get the graph right and I cant figure out what I've done wrong.
Any help appreciated. Files attached.

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And what seems to be the Q?
I'll note there doesn't seem that there should be any reason to have to run this in a loop; that's very inefficient and doesn't make any use at all of the primary feature of Matlab; MATrix LABoratory. Octave is a work-alike with similar features; learn to use it as intended as well.
HINT:
While I didn't study the code at all thoroughly, the if block in the plotting is very poorly structured as multiple separate blocks for all cases instead of as one construct. They could possibly be part of the problem altho as noted I didn't read it carefully enough to be sure one way or the other; just that it's awkward at best.
Logical addressing would be "the Matlab way" for such an operation.
[Answers Dev] Restored edits made to question and body.
@Anusha Sridharan:thank you! Is it also possible to restore the question's original attachment?

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Stephen Cobeldick 님의 답변 10 Nov 2018
Stephen Cobeldick 님이 편집함. 10 Nov 2018
 채택된 답변

% 1)
M0 = [1,4,3,100,12,1000,25,32,500,700,20,9000,25,650,40,3,67,2,305,80,200,50,2,15,4];
M1 = [1,6,2,120,14,900,25,35,550,650,23,7500,25,700,43,6,72,8,360,70,220,60,1,14,8];
M2 = [1.5,5,7,150,13,550,1,40,520,600,27,5500,27,900,44,12,75,9,360,50,190,50,4,13,6];
M3 = [122,120,120,170,140,700,100.5,134,570,600,125,6100,125,1050,122,130,187,109,460,145,330,160,105,113,104];
M4 = [25,25,30,40,50,600,6,33,500,600,26,5500,26,1150,14,32,126,8,360,28,230,60,2,13,5];
% 2)
M = [M0;M1;M2;M3;M4];
% 3)
M = M - (M(:,end)-mean(M(:,end)));
% 4a)
RM = (M - min(M,[],1)) ./ mean(M,1);
% 4b)
ARM = RM + (1 - RM(1,:));
% 5)
idr = ARM(5,:)>1.3;
idb = ARM(5,:)<0.7;
idg = ~idr & ~idb;
plot(ARM(:,idr),'r',ARM(:,idb),'b',ARM(:,idg),'g')
Note:
  1. The deadline for this homework was yesterday.
  2. Your professor/tutor can find this website just as easily as you can.
  3. Submitting work that is not your own without acknowledgement is plagiarism.

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