How to check every single element in a vector

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Abdul A on 23 Feb 2017
Edited: Abdul A on 27 Feb 2017
Hello everyone, I have a question about Matlab. I have a vector A=[ 1 1.2 1.3 1.4] and I need to create a loop to check every single element. Here is what I am trying to do:
for i= 1:100
whatever equations or process that gave me A=[ 1 1.2 1.3 1.4]
if A>=0.5
%(I want to check every single element not just a particular one. if not, I want Matlab to calculate a new value for A and check it again and again until they all less than 0.5. we started from i=1 in the first iteration. if the condition is not fulfilled take i=2, calculate a new A, and check again)
else
break
end
end
where A is printed vertically A=A(:)
Thank you

Abdul A on 27 Feb 2017
Edited: Abdul A on 27 Feb 2017
Thank you for your prompt response.
for i=1:100
A=[? ? ? ?]
if any (A>=0.5)
else
break
end
end

Beder on 23 Feb 2017
B=zeros(size(A));
B(A>=0.5)=1;
while sum(B)>0
for i=1:size(B)
if B(i)==1
A(i)=YOURFUNCTION
end
end
B=zeros(size(A));
B(A>=0.5)=1;
end
not tested. But maybe a hint how to do it. There will be for sure more advanced solutions out there :)