plot multiple lines in a graph

Hi, my code is the following:

%%Initialize variables.

workDir='C:\Users\gabri\Desktop\Nova_pasta\Arquivos_Saida_Imex';

for i=1:25

cd(workDir);

   pasta= ['cd  ' num2str(i) ];
   eval (pasta)

delimiter = '\t';
startRow = 6;

formatSpec = '%f%f%f%f%[^\n\r]';

%%Open the text file.
fileID = fopen('arqanepi.rwo','r');

dataArray = textscan(fileID, formatSpec, 'Delimiter', delimiter, 'HeaderLines' ,startRow-1, 'ReturnOnError', false);

%%Close the text file.

fclose(fileID);

%%Allocate imported array to column variable names

days(:,i) = dataArray{:, 1};

Oil(:,i) = dataArray{:, 2};

Gas(:,i) = dataArray{:, 3};

Water(:,i)= dataArray{:, 4};

   cd (workDir)

end

plot(days(:,1), Oil(:,1))

     hold on

for i=2:25

plot(days(:,i), Oil(:,i))

hold off

end

I have a problem in the plotting phase. I only get a single line of oil x days.

Can someone help me to plot all 25 lines of Oil in one single graph of oil x days?

Thanks in Advance !

[Walter Roberson]

duplicates http://uk.mathworks.com/matlabcentral/answers/271755-plotting-multiple-text-files-columns-in-the-same-graph