Plotting Temperature with respect to time in MATLAB from a file??

Question

Arun Sharma 2013-10-7

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评论： Arun Sharma 2013-10-10

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.

41:03,05/10/13,025.7C,+024.5C,060.0%,000.00m/s,0,0000.0mm,0000.0mm
41:17,05/10/13,025.7C,+024.8C,060.0%,000.00m/s,0,0000.0mm,0000.0mm
41:32,05/10/13,025.4C,+024.8C,059.3%,000.00m/s,0,0000.0mm,0000.0mm
41:48,05/10/13,025.7C,+025.1C,059.3%,000.00m/s,0,0000.0mm,0000.0mm
29:50,05/10/13,026.0C,+024.8C,059.0%,000.00m/s,0,0000.0mm,0000.0mm
30:04,05/10/13,025.7C,+024.8C,058.7%,000.00m/s,0,0000.0mm,0000.0mm
30:04-> Time
05/10/13-> Date
7C -> Unit Temperature
+024.8C -> Atmosphere Temperature
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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Answer 1

Walter Roberson 2013-10-7

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在 MATLAB Online 中打开

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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Answer 2

Arun Sharma 2013-10-7

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https://ww2.mathworks.cn/matlabcentral/answers/89362-plotting-temperature-with-respect-to-time-in-matlab-from-a-file#answer_98816

编辑：Walter Roberson 2013-10-7

在 MATLAB Online 中打开

LOGGER.CSV

I had attached the file, and its not working

I found some errors like

fid = fopen('YourFile.txt');
datacell = textscan(fid, '%s%s%fC%fC%f%*[^\n]', 'Delimiter', ',');
fclose(fid);

I will try to use your code.

Can i use datetick function in MATLAB for solving my problem

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Arun Sharma 2013-10-7

Thanks Sir, Actually i solved my Problem using dataticks, i will see your method to,it also looks interesting.

Arun Sharma 2013-10-10

在 MATLAB Online 中打开

Thank You So Much, I tried your method and it works. :-)

Here is the Code i wrote.

fid = fopen('LOGGER.CSV','r');
DataCell = textscan(fid,'%s %s %fC %fC %f%*[^\n]',1329,'Delimiter',',')
FullDate = strcat(DataCell{2},{' '},DataCell{1})
DateNumbers = datenum(FullDate,'mm/dd/yy HH:MM:SS')
UnitTemp = DataCell{3}
AtmTemp = DataCell{4}
Humidity = DataCell{5}
fig figure1
fig1 = figure();
ax1 = axes('Parent',fig1)
plot(DateNumbers,UnitTemp,'Parent',ax1);
grid on
axis([min(DateNumbers) max(DateNumbers) 20 30])
datetick(ax1,'x','HH:MM')
xlabel('Time\rightarrow');
ylabel('Temperature \rightarrow');
title('Temperature Graph 5th October');
fclose(fid);