[julia-users] Writing CSV

[digxx]

with
writedlm("C:\\Users\\Diger\\Documents\\Julia\\x_values.csv",zip(x_s[1,1:end],x[1:end],epsilon[1,1:end,1],omega[300,1:end,1]),',')
I wanted to write a csv file comma separated...
Now in the manual it says that everything is saved as string, though the 
last column (omega) is saved as double which is actually what i wanted.
How can I get the others to be saved as double as well?