compare integer values

How i can compare between each element in specific matrix and constant value as 0.5 and then take action if the result true .

Answer 1

[Image Analyst]

You mean something like this:

% Make some sample data.
m=rand(1, 10)
% See where it exceeds 0.5.
biggerThanPoint5 = m > 0.5
% Make some other array that we want to act upon.
out = 11 * ones(1,10)
% Set out = 99 where m>0.5
out(biggerThanPoint5) = 99

Results in command window:

m =
    0.4898    0.4456    0.6463    0.7094    0.7547    0.2760    0.6797    0.6551    0.1626    0.1190
biggerThanPoint5 =
     0     0     1     1     1     0     1     1     0     0
out =
    11    11    11    11    11    11    11    11    11    11
out =
    11    11    99    99    99    11    99    99    11    11

[Bayan]

thanks a lot ^_^

Answer 2

[Honglei Chen]

Say you have the matrix A, and you have a function foo contains the operation you'd like to apply to elements of A if they equal to 0.5, you can do

A(A==0.5) = arrayfun(@foo,A(A==0.5))