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Matt Learner

How to find the location of a minimum value in cell array?

Asked by Matt Learner
on 28 Nov 2012
Latest activity Commented on by Walter Roberson
on 26 Aug 2015 at 10:32

consider the following example, Suppose if I have a cell notation

q=cell(5,1);

And if I have different dimensions for each cell, for example

q{1} = [6 7 9 4 0 0 1 2 3 1];
q{2} = [3 5 0 4 0 0 1 2 8 1];
q{3} = [3 5 0 5 4 3 4 2 6 4 0 0 1 2 8 1];
q{4} = [4 0 0 1 2 8 1];
q{5} = [4 0 0 0 2 8];

Now if I wish to find the latest cell location containing minimum non zero value, How can I find it?

In the above example, minimum non zero value is 1 and it is present in all cells, that is, q{1} q{2} q{3} q{4} except q{5}. So here the latest cell containing 1 is q{4} and 1 is located at 4th and 7th place of q{4}. I wish to get the location details mentioning that value 1 is present in q(4,4) and q(4,7). How can I find that?

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2 Answers

Answer by Matt Fig
on 28 Nov 2012
 Accepted answer
L = cellfun(@(x) find(x==1),q,'Un',0);

Now L has all the information you need.

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Matt Learner
on 28 Nov 2012

Thank you very much for your help. It completely solved my issue.

Thanks again. :)

nadia nadi
on 26 Aug 2015 at 10:16

Dear,

if I want to find minimum matrix from this code what should I do. I tried your code but I couldn't fit it to my code. I have many matrices when I want to find the maximum one by using the size I get the right answer but for minimum matrix I got empty matrix. I used this code

for i=1:10
MaxSubmat=load('MaxSubmatfile.txt');
Remind=load('Remindfile.txt');
ee{i}=MaxSubmat;
aa{i}=Remind;
end
[SizeMaxSubmat,MaxSubmat1]=max(cellfun(@(x) size(x,2),ee ))   
[SizeRemind, Remind1]=min(cellfun(@(x) size(x,2),aa ))
MaxSub=ee{MaxSubmat1};
Reminder=aa{Remind1};
sizeReminder=size(Reminder,2)

I don't why it give give Reminder=[] and sizeReminder= 0 for while I know is more than one. could you please help me with this code I will appreciate that a lot.

regards, Nadia

Walter Roberson
on 26 Aug 2015 at 10:32

You are load()'ing the same file each time, and it has no data in it.


Answer by Vishal Rane
on 28 Nov 2012

The first thing that comes to mind is

find(q{n} > 0)

It will you give you locations of elements matching the condition ' > 0' in q{n}, else it returns empty.

You could use that to build your logic.

Refer Link for examples on the find command.

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