help with matrix manipulation

Hello all,

I currently have two matrices, called rangetruncate and afmagtruncate, with the nth row of each representing a series of x and y coordinates. As the matrix rangetruncate has multiple values in each row that are the same I wish to add together the corresponding afmagtruncate values and average, leaving each row in the afmagfinal matrix corresponding to a single vector of x coordinates called finalrange. The rangetruncate matrix has been previously rounded to 2 dp. The code i have written however seems to skip out iterations every now and again and i cant figure out why.

    [e f] = size(rangetruncate);
    rangefinal = 0:0.01:10000;
    afmagfinal = zeros(e,numel(rangefinal));

    % create loop for each row then parse for each value of rangefinal
    for i = 1:e
        for j = 1:numel(rangefinal)
            thisrange = rangefinal(j);
            total = 0;
            count = 0;
            for k = 1:f
                if thisrange == rangetruncate(i,k);
                    % sum of y values
                    total = total + afmagtruncate(i,k);
                    % increment number of occurrences
                    count = count + 1;
                end
            end
            % perform average and store in afmagfinal
            afmagfinal(i,j) = total/count;
        end
    end

I would be very grateful if you could offer any suggestions as to what could be the cause or an easier way of doing it. Many thanks

Answer 1

[Walter Roberson]

http://matlab.wikia.com/wiki/FAQ#Why_is_0.3_-_0.2_-_0.1_.28or_similar.29_not_equal_to_zero.3F

[Evan]

Thanks very much for the help