Plotting Temperature with respect to time in MATLAB from a file??
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Hello!!! Everyone,
I am making a Data Logger Project and had stored Log in Memory Card, and wants to plot the Temperature Data with Respect to time in MATLAB.
18:41:03,05/10/13,025.7C,+024.5C,060.0%,000.00m/s,0,0000.0mm,0000.0mm
18:41:17,05/10/13,025.7C,+024.8C,060.0%,000.00m/s,0,0000.0mm,0000.0mm
18:41:32,05/10/13,025.4C,+024.8C,059.3%,000.00m/s,0,0000.0mm,0000.0mm
18:41:48,05/10/13,025.7C,+025.1C,059.3%,000.00m/s,0,0000.0mm,0000.0mm
18:29:50,05/10/13,026.0C,+024.8C,059.0%,000.00m/s,0,0000.0mm,0000.0mm
18:30:04,05/10/13,025.7C,+024.8C,058.7%,000.00m/s,0,0000.0mm,0000.0mm
18:30:04-> Time
05/10/13-> Date
025.7C -> Unit Temperature
+024.8C -> Atmosphere Temperature
058.7% -> Relative Humidity
Rest are Not useful
Can any one tell how to plot Temperature w.r.t time for each day on Separate graphs(Figure in MATLAB)
Please Help
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Walter Roberson
2013-10-7
fid - fopen('YourFile.txt');
datacell = textscan(fid, '%s%s%fC%fC%f%*[^\n]', 'Delimiter', ',');
fclose(datacell);
fulldates = strcat(datacell{2}, {' '}, datacell{1});
datenumbers = datenum(fulldates, 'mm/dd/yy HH:MM:SS');
unittemps = datacell{3};
atmtemps = datacell{4};
relhums = datecell{5};
fig1 = figure();
ax1 = axes('Parent', fig1);
plot(datenumbers, unittemps, 'Parent', ax1);
datetick(ax1, 'x', 'HH:MM:SS');
title(ax1, 'Time vs Unit Temperature, Uni');
The refinement after this would be to split it down to individual days. For example as a quick hack:
datechars = char(datacell{2});
differentdates = any(diff(datchars, 1), 2);
Then differentdates will be true at location K if the K'th date differs from the (K+1)'th date and so indicates that you should split after the K'th row. Note that the result will be one element shorter than the number of row entries.
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