Move element to the end of the vector.

Hi there.

I am trying to create a function that moves every element of 'v' that is equal to 'a' to the end of the vector. Argument 'v' is the first input and it is a row-vector, while 'a' is a scalar. For example, the command

>> x = move_me([1 2 3 4],2);

makes x equal to [1 3 4 2]

So my function so far looks like this:

function w=moveme(v,a)

for ii=1:length(v)
    if v(ii)==a          
       w=[v(v~=a) v(v==a)];
     end
end

and seems to work fine. But when I add an extra component to account for the scenario in which no element equals 'a' then my function doesn't work:

for ii=1:length(v)
    if v(ii)==a          
       w=[v(v~=a) v(v==a)];
    else
        w=v;
    end
end

What am I missing here?

Answer 1

[Matt J]

Your loop index ii is not being used. There is no need to use a loop anyway. It can be done in one line:

function w=moveme(v,a)

     w=[v(v~=a),  v(v==a)];

[Ioannis Georgopoulos]

Thank you Matt for your prompt reply.