# Indexing concatenated matricies without changing the order

조회 수: 5(최근 30일)
Elia 2014년 10월 30일
댓글: Abhiram Bhanuprakash 2014년 10월 31일
I'm attempting to index an outputted matricy from one function into a bigger matricy. My code at the moment:
% code
while j <= length(sec)
y=sec(j,:);
[max,~]=coros(y,thershold,x);
maxbox = [maxbox;max];
j=j+1;
end
The output max finds the largest values in a data set and outputs it as a matricy [x y]. Sample output:
if true
3 10
5 12
9 15
end
I then use maxbox = [maxbox;max]; to concatenate the matricies. I'd like to have each output correspond to the value of j it was found at. So that I know when they occur as well as where they occur. (j being time).
Sample of desired output:
if true
j 3 10
j 5 12
j 9 15
end
Before I concatenate it with the next matricy of values at j+1. Help is appreciated! Thanks.

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### 채택된 답변

Abhiram Bhanuprakash 2014년 10월 30일
Hi Elia,
I guess you can use the 'ones' and 'size' functions to do this.
In your case, inside the 'while' loop, you can do:
maxbox = [maxbox;max];
temp = j*ones(size(maxbox,1),1);
maxbox = [temp maxbox];
j = j+1;
end
For documentation on 'ones' and 'size' functions, you can refer:
- ones: here
- size: here
Hope this helps,
Cheers!
Abhiram
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Abhiram Bhanuprakash 2014년 10월 31일
Thanks Elia and Image Analyst!

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