How to calculate Signal to noise ratio of multiple signals?

i have (.dat) file consisting of 24 signals of size 2040*24 and i need to calculate the SNR of each signal. How can i do that? Here is my attached file.

Answer 1

[KSSV]

[m,n] = size(data) ;  % where data is 2040*24 matrix 
S = zeros(n,1) ; 
for i = 1:n
    S(i) = snr(data(:,i)) ; 
end

[LOVKESH SHIVANI]

thanks. but i am getting negative value of snr among them for several of my signals which is doubtful. Is there anything which can be interpreted with it, beside that noise power is dominant than signal power or communication isnt possible.