Real time plotting with text file - iphone

Question

I am trying to do real-time plotting (or close to real-time, as long as it updates every 1 to 2 second) of the temperature vs time. The temperature and time data will be stored in a text file. This text file will be constantly updated by a separate program.
Is it possible to do this using Matlab or C?
I found these codes online, but I have no idea how to use them; do I just create a new Matlab script and put them into the script?
function [t] = livePlot(period, filename)
//% inputs : period : update rate in seconds
//% filename : name of the file to get data from
//%
//% outputs: t : the timer object
//% >> stop(t)
//% ends streaming
//%%
close all;
t = timer('StartDelay', 1, 'Period', period, ...
'ExecutionMode', 'fixedRate');
//%% timer object callback functions
t.StopFcn = {#stopFigure};
t.TimerFcn = {#updateFigure};
//%% initialize timer object user data
d = get(t, 'UserData');
d.data = []; % array for the data to plot
axes('Position', [0 0 1 1], 'Visible', 'off');
d.axes_handle = axes('Position', [.2 .1 .7 .8]);
d.line_handle = plot(NaN,NaN);
d.fid = fopen(filename, 'r');
set(t, 'UserData', d);
start(t);
end
function stopFigure(obj, event)
//% close function handle
d = get(obj, 'UserData');
fclose(d.fid);
end
function updateFigure(obj, event)
d = get(obj, 'UserData');
//% read new data from file
tmp = readFile(obj);
//% append to array in user data
d.data = [d.data transpose(tmp)];
//% update the plot
set(gcf, 'CurrentAxes', d.axes_handle);
set(d.line_handle, 'XData', 1:length(d.data), 'YData', d.data);
//% store the timer object user-data
set(obj, 'UserData', d);
end
function [tmp] = readFile(obj)
//% read binary data. file-ID is in the timer user-data
d = get(obj, 'UserData');
tmp = fread(d.fid);
fprintf('Current file location : %d \n', ftell(d.fid));
//% fprintf('End of file indicator : %d \n', feof(d.fid));
//% reset the end-of-file indicator
fseek(d.fid, -1, 0);
fseek(d.fid, 1, 0);
//% fprintf('End of file indicator : %d \n', feof(d.fid));
set(obj, 'UserData', d);
end

Answer 1

If your text file contain following value for temperature and date.sorry for not in proper format bu consider column 1 for day,2 for time and 3 for temp.
Day Time Temp
1 09:00 16
2 09:00 16.2
Then you can use below sample c code for ploting
f = fopen('yourdata.txt');
c = textscan(f,'%f %s %f','HeaderLines',1);
fclose(f);
d = [c{1}-1 + rem(datenum(c{2},'HH:MM'),1), c{3}];