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Compare rows of a column vector

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marie lasz
marie lasz 2021-2-16
回答： Rik 2021-2-17
Hey beautiful people,
I am confused here that i have this vector and i have to compare three values of each row and result should give the most appearing (frequent )value. It is a kind or error correction , in some rows there is one different value and two values are same which I didn't capture. Can some one help me how should i compare each row with three col values? that is how I obtained that by this code.
vec= ones(1024, 1);
ex=[1 1 1];
ex_vec=vec.*ex;
b_w_img--watermarked image
b_img--host image
for k = 1 : numel(b_img)
% diff = b_W_img{k}(4,2) - b_img{k}(4,2);
diff = round((b_W_img{k}(4,2)),1) -round(( b_img{k}(4,2)),1);
ex_vec(k)=diff;
end
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marie lasz
marie lasz 2021-2-16
编辑：marie lasz 2021-2-16
Not yet , because I was testing with mode function. and why I will not need a loop ? I have to insert those single value resulty in a matrix. Let me see the documentation.
Jan
Jan 2021-2-16
Do you mean:
ex_vec(k, :) = diff;
% ^
The code
vec= ones(1024, 1);
ex=[1 1 1];
ex_vec=vec.*ex;
can be simplified to:
ex_vec = zeros(1024, 3);
Or do I oversee something?

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回答（2 个）

Jan
Jan 2021-2-16
编辑：Jan 2021-2-16
The screenshot show the contents of ex_vec. It does not matter how you have obtained it. All you want to know is how to find rows with less then 3 equal elements. Did I understand this correctly?
not3EqElem = sum(ex_vec == min(ex_vec, [], 1)) < 3;
or
not3EqElem = ~(ex_vec(:, 1) == ex_vec(:, 2) & ex_vec(:, 2) == ex_vec(:, 3));
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Jan
Jan 2021-2-17
Why is 0.4 the most frequent value in [ 0, 0,4 -0,4 ] ? Do you mean [0, 0.4, 0.4] or should the sign be ignored?
If mode() satisfies your needs, using this command would be athe best idea.
marie lasz
marie lasz 2021-2-17
yes I meant that [0, 0.4, 0.4]. but don't know how it will read row wise.

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Rik
Rik 2021-2-17
Ran in:
Just like most functions like it, mode allows you to specify the dimension to operate on:
A= [0, 0.4, 0.4;...
1, 1, 0];
mode(A,2)
ans = 2×1
0.4000 1.0000

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