# Program for MAX & MIN

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DP 2019 年 10 月 25 日
Commented: Rena Berman 2019 年 12 月 12 日
This code not giving me maximum,minimum value and index that i am looking for. so i want the 3 maximum and 2 minimum values and index that will be same as plot figure.
and this new code will true for any TT array
close all;
TT = [ 50 0 136 30 80 59 59 229 59 20 152 69 72 120 36 233 2 8 52 156 20 30 119 5 101 177 50 25 209 33 96 67 68 125 67 100 127 83 95 88];
NN = 1:1:40;
figure (1)
stem (NN,TT);
D = movmean (TT,5);
figure (2)
plot (NN,D)
%% threeMax and twoMin will be used to store the max and min values
threeMax = zeros(1,3);
twoMin = 100*ones(1,2);
max1index = 0;
max2index = 0;
max3index = 0;
min1index = 0;
min2index = 0;
%% loop logic to rank largest 3 elements in descending order
for i = 1:1:length(D)
if D(i) > threeMax(1)
threeMax(3) = threeMax(2);
max3index = max2index;
threeMax(2) = threeMax(1);
max2index = max1index;
threeMax(1) = D(i);
max1index = i;
elseif D(i) > threeMax(2)
threeMax(3) = threeMax(2);
max3index = max2index;
threeMax(2) = D(i);
max2index = i;
elseif D(i) > threeMax(3)
threeMax(3) = D(i);
max3index = i;
else
end
end
%% loop logic to locate the 2 smallest nonzero elements
for i = 1:1:length(D)
if D(i) < twoMin(1) && D(i) > 0
twoMin(1) = D(i);
min1index = i;
elseif D(i) < twoMin(2) && D(i) > 0
twoMin(2) = D(i);
min2index = i;
else
end
end
AND ALSO SEE EXAMPLE FIGURE THAT I UPLODED
THANK YOU

#### 7 件のコメント

John D'Errico 2019 年 10 月 25 日
A little demanding are you? Yes, sir! We will immediately assign our best person to this task, because we know you are important, and we cannot allow you to have to learn MATLAB yourself.
Think of it like this: when you ask a confusing or ambiguous question, expect people to be unwilling to jump in there and offer help. Odds are they will guess wrong on any assumptions they need to make because you were not explicit in what you are asking. Then they will need to make multiple responses. Sorry, but for me, its not worth the hassle, and that will be true for many others. Remember that we are purely VOLUNTEERS on Answers.
Also, if you demand that people answer you immediately, then expect people to be a little leery of responding too.
So if you want help, then make your question CLEAR. And RELAX. Someone may decide to answer your question, or not, and it may take longer than you want. Remember that Answers is a free site. If you insist on an immediate answer, then you might consider paying someone for the service. I'm sure there are people who would be willing to write your code for you for the correct fee.
Star Strider 2019 年 10 月 25 日
@John D’Errico — Thank you!
Rena Berman 2019 年 12 月 12 日

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### 件の回答 (2)

David Hill 2019 年 10 月 26 日
Your plot is not marking the three maximum values. If you did want the maximum values and the minum values in between, then you could just force it.
[M1,i1]=max(TT);
TT(i1)=nan;
[M2,i2]=max(TT);
TT(i2)=nan;
[M3,i3]=max(TT);
m=sort([i1,i2,i3]);
[m1,i4]=min(TT(m(1):m(2)));
[m2,i5]=min(TT(m2:end));

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Image Analyst 2019 年 10 月 28 日
It's not clear how those particular locations were chosen. My best guess is that you are trying to find the peaks and valleys of a smoothed version of your data. So I'd try movmean() or sgolayfilt() followed by findpeaks().

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