replace array value

2011 5 5
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I have a matrix
A=[1 2 3; 4 6 6;7 7 7]
I want to replace all 6 in the second column with 12 i.e A should be
as follows: A=[1 2 3; 4 12 12;7 7 7]
How to do that easily?

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Andrei Bobrov
Andrei Bobrov 2011-5-5

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A(A==6)=12

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Actually I need to know replace a particular value of a particular column or row with a specific value. your code replace all values having 6 i.e if
A=[1 2 3; 4 6 6;7 6 7] then output is
A=[1 2 3; 4 12 12;7 12 7]
but output need is:
A=[1 2 3; 4 12 6;7 12 7]
Oleg Komarov
Oleg Komarov 2011-5-5
A(A(:,2)==6,2) = 12;

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