function plot_file(filename)
% plot_file(filename)
%   Plots all of the data in the file
%   The file should be of the form:
%
%   x1 y1 z1 ...
%   x2 y2 z2 ...
%   ...

% read in the data into a matrix
data = dlmread(filename);

[rows, cols] = size(data);

% tell matlab to add plots to a single graph 
% rather than replotting each one individually
hold all

% plot the data
for col = 2:cols
    plot(data(:,1), data(:, col))
end