Search all elements from from array A in array B and write it workspace

Hello All,

Iam trying to code to Search all elements from array A in array B and write it workspace

Array A = [0.012 0.014.... 5.04];

Array B = [0.01 0.36 0.125 0.36 .. 10.04];

my approach

for i = 1: length(Array A)

if Array A(i) = [Array B]

Output = Array A(i);

end

i = i+1;

end

<<This is not working>>

Any support would be great.. Thanks

[Adam]

It would help if you just post actual code. 'Array A' clearly is not a valid variable name.

You would also do well to read the basic Matlab help on for loops

doc for

i = 1:length( A )

will already iterate through your for loop so adding

i = i + 1;

is not required.

Also

if Array A(i) = [Array B]

is wrong/invalid in every way possible:

• Putting [ ] around a variable is un-necessary
• = is an assignment operator. == is a comparison operator
• A(i) == B would give you an array of results so you wouldn't want to put this in an if statement
• You shouldn't use the equality operator at all on floating point data due to inaccuracies in the way such data is stored. Testing equality within a tolerance is almost always better.

    doc ismembertol

will help you with this if you are using R2015a or later.

Answer 1

[Raj]

Your thinking is basically correct.

for i = 1: length(Array A) % Start with first element of A
if Array A(i) = [Array B] % compare each element of A (one at a time) with all elements of B
Output = Array A(i); % if match found then write it as Output in workspace
end
i = i+1; % increment index for A
end

However there are many syntax errors. Use this:

for i=1:numel(A)
    for j=1:numel(B)
        if A(i)==B(j)
            output(i)=A(i);
        end
    end
end
output=output(output ~= 0)

Recommend going through some basic MATLAB tutorials.

Answer 2

[Andrei Bobrov]

Output = A(ismember(A,B))