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Find the row and col of array?

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Tara
Tara 2013-4-22
i have an array
A=[0.9784 0.0102 0.0045;0.0085 0.9784 0.0730;0.9673 0.0156 0.0063];
before i get A, i create A = zeros(numTest,numLabels);
i want to find the row and col,i try
co=find(A==0.9784)
but it result Empty matrix: 0-by-1. what should i do? Thank you

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Image Analyst
Image Analyst 2013-4-22
You should read the FAQ: http://matlab.wikia.com/wiki/FAQ#Why_is_0.3_-_0.2_-_0.1_.28or_similar.29_not_equal_to_zero.3F After that, if you still don't understand, write back.
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Walter Roberson
Walter Roberson 2013-4-22
You don't. That value, 0.9784, does not exist in the matrix. At the command line, give the command
format long g
and then
disp(A(1))
and
disp(A(1)-0.9784)
Image Analyst
Image Analyst 2013-4-22
Try this:
[rows, columns] = find(abs(A-0.9784) < 0.00009)
In the command window:
A =
0.9784 0.0102 0.0045
0.0085 0.9784 0.073
0.9673 0.0156 0.0063
rows =
1
2
columns =
1
2
So the value happens at (1,1) and (2,2).

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