Biuld Min Index Array from Two dimensional Array

2011 6 30
2 个回答
1 次查看（30 天）

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Hi Guys,
I got a question on Matlab. I am trying to build Array of min values from Two dimensional Array. Basically, the idea is to look for minimum value at each column & record the index.
If there are more then one minimum value then record it in different array, but the new array upto that point should be similar to previous one.
Its like finding minimum values link from mxn array.
Can you please help me to efficiently code this?
Thanks

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回答（2 个）

Sean de Wolski
Sean de Wolski 2011-6-30

0 个投票

[junk, index] = min(your_matrix); %will get you the first index
To get all minimum indices:
A = magic(4); %sample
A(7) = 2; %set duplicate for example
[r c] = find(bsxfun(@eq,min(A),A)); %all column mins
colmindex = accumarray(c,r,[],@(x){x})' %bin them into a row vector cell array with each index
Ruk Niz
Ruk Niz 2011-6-30

0 个投票

Hi Sean, Thanks for reply. This gives me the first Minimum at each column.
I am hoping to build multiple level of index. If say one column contains more than 1 minimum then I would like to create multiple single index array.
Say A =
0 0 1 2 3 4
2 3 1 3 4 1
1 1 2 0 3 7
>> [junk, index] = min(A)
junk =
0 0 1 0 3 1
index =
1 1 1 3 1 2
Gives only the first minimum index but if you look at the matrix. I am hoping to get the following
index1 = 1 1 1 3 1 2 index2 = 1 1 2 3 1 2 index3 = 1 1 1 3 3 2 index4 = 1 1 2 3 3 2
same for junk variable.
Rdgs Ruk

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Ruk Niz
Ruk Niz
2011-6-30

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