Enter values into x array and y array

Hi, I have sorted the data out of the txt file. I wonder how could I enter the year and dat into an x and y array respectively so that I can plot (x,y). Thank you.

 filename = input('Please enter the file name: ');
 fid01 = fopen(filename,'r');
 for i= 1:15
    line = fgets(fid01);
 end
 for i = 16:66
    line = fgets(fid01);
    z = strread(line,'%s');
    year = str2num(z{1});  
    for j = 2:13
        dat = str2num(z{j});
        if ( dat== -99.9900)
            dat = NaN;
        end      
        year = year + (j-1)/12 ;
        x = year;
        y = dat;
        fprintf('%f      %f\n',x,y);
    end
 end

Answer 1

[Walter Roberson]

fmt = repmat('%f',1,14);
fid = fopen('CO2.txt','rt');
data = textscan(fid, fmt, 'HeaderLines', 15, 'CollectOutput', 1);
fclose(fid);

x = bsxfun(@plus, data{1}(:,1), (0:11)/12);
y = data{1}(:,2:13);
y(y<0) = nan;
plot(x, y);
legend({'Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'});