How can I sort an array of repeating elements

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mohan
mohan 2013-4-1
Hi
I have the following array (20 by 2). The 1st column is node number and 2nd is temperature. The temperature is in descending order. There are 6 different values of temperatures. How can I sort this array such that it outputs;
set1 temp=670K nodes=10,14,15
set2 temp=668K nodes=385,431,432,440,441,442
set3 temp=655K nodes=649,650,959,960,961
set4 temp=654K nodes=80
set5 temp=653K nodes=89,90,651,652
set6 temp=646K nodes=646
ARRAY:
10 670.0
14 670.0
15 670.0
385 668.0
431 668.0
432 668.0
440 668.0
441 668.0
442 668.0
649 655.0
650 655.0
959 655.0
960 655.0
961 655.0
80 654.0
89 653.0
90 653.0
651 653.0
652 653.0
79 646.0
I hope the above is clear. Let me know if its not.
Thanks in advance.
Mohan
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Image Analyst
Image Analyst 2013-4-2
So the output is a cell array of strings:
ca{1} = 'set1 temp=670K nodes=10,14,15'
ca{2} = 'set2 temp=668K nodes=385,431,432,440,441,442'
ca{3} = 'set3 temp=655K nodes=649,650,959,960,961'
ca{4} = 'set4 temp=654K nodes=80'
ca{5} = 'set5 temp=653K nodes=89,90,651,652'
ca{6} = 'set6 temp=646K nodes=646'
or if you don't actually want to store those strings, then just print them out to the command line or a text file? Please define exactly what and where "outputs" means.
mohan
mohan 2013-4-3
Hi
The exact outputs I require is:
OUTPUT 1: group the nodes to sets but only when there are more than 1 node. see below.
*Nset, nset=set1
10, 14, 15
*Nset, nset=set2
385, 431, 432, 440, 441, 442
*Nset, nset=set3
649, 650, 959, 960, 961
*Nset, nset=set4
89, 90, 651, 652
OUTPUT 2: now combine the above information and temperature data and single node values. see below.
set1, 670
set2, 668
set3, 655
80, 654
set4, 653
79, 646
I hope the above is clear. Please get back to me if not.
Thanks
Mohan

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回答（3 个）

Image Analyst
Image Analyst 2013-4-1
Did you try sortrows():
% Sort by column 2 in descending order.
sortedArray = sortrows(ARRAY, -2)
Brian B
Brian B 2013-4-1
It depends how you want to store the sets. If you are comfortable with cell arrays, you can create one vector with the unique temperatures, and then create a cell array of the same size such that each cell has the set of nodes withe the corresponding temperature:
temperatures = unique(ARRAY(:,2));
nodes = arrayfun(@(temp)ARRAY(ARRAY(:,2)==temp, 1),temperatures,'UniformOutput',0)
Andrei Bobrov
Andrei Bobrov 2013-4-1
a = [10 670.0
14 670.0
15 670.0
385 668.0
431 668.0
432 668.0
440 668.0
441 668.0
442 668.0
649 655.0
650 655.0
959 655.0
960 655.0
961 655.0
80 654.0
89 653.0
90 653.0
651 653.0
652 653.0
79 646.0];
[b, ~, c] = unique(a(:,2),'stable');
out = [num2cell((1:max(c2))') num2cell(b) accumarray(c2,a(:,1),[],@(x){x})];

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