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How to compare value for two variable?

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Tan Wen Kun
Tan Wen Kun 2015-12-6
编辑： Tan Wen Kun 2015-12-6
matrix=
1 1 2 2
1 1 2 2
1 1 2 2
I got a matrix that store label 1 and 2 have mean value
meanR(1) = 10.33
meanG(1) = 20.33
meanB(1) = 30.33
meanR(2) = 12.33
meanG(2) = 23.33
meanB(2) = 34.33
so how I can compare both label?
what is the function name in matlab for compare?
what is the syntax for and(& or &&) in if operation?
if compare((meanR(1),meanR(2)<=5) && (meanR(1),meanR(2)<=5) && (meanR(1),meanR(2)<=5))
chg all label 2 to 1
result =
1 1 1 1
1 1 1 1
1 1 1 1
  2 个评论
Jan
Jan 2015-12-6
The question is not clear. I cannot guess, what the "compare" operator should do. Why do you check if "meanR(2) <= 5"?
Tan Wen Kun
Tan Wen Kun 2015-12-6
编辑：Tan Wen Kun 2015-12-6
I want to compare whether the meanR, meanG, meanB value of label 1 and label 2 is within 5 or not? If this 3 statement true then I assign label 2 to label 1.

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回答（1 个）

dpb
dpb 2015-12-6
I presume you intended the three variables, not the same variable three times...simplest would be to first change storage/naming to not have to deal with three separate variables but only one. So first write
mnRGB=[meanR;meanB;meanG]; % or better yet, define this way from git-go instead
Then, the test is simply
if all(diff(mnRGB,2)<=5))
matrix(matrix==2)=1;
end
Above is a signed comparison, if it's an absolute or magnitude-only test wanted, then encapsulate the diff() operation inside abs of course.
See
doc if
doc diff
doc all
for details on syntax and Matlab's definition of TRUE for arrays and vectors.

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