How to compare value for two variable?

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

[Jan]

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]

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.

Answer 1

[dpb]

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.