Dirunal Plots from Timetable data in Matlab

Hi , I have a time table with rows of Time and gas concentratios (NOx and SO2). These are hourly concentrations from 25.06.2019- 18.08.2019, with the time format in the column as '25.06.2019 01:00:00".

Now I need to make one dirunal Plot for all NOx and SO2, for the enttire period.

How do I go about it. Thanks

Answer 1

[Hari]

Hi Roseline Thakur,

I understand that you have a timetable containing hourly gas concentration measurements (NOx and SO2) from June 25, 2019, to August 18, 2019 and you wanted to create a diurnal plot for both NOx and SO2 concentrations over the entire period, showcasing the daily variation in concentrations.

To create a diurnal plot for your data, you follow the below steps:

1. Extract Hour of Day: Since you're interested in diurnal patterns, the first step is to extract the hour of the day from your timestamps. This will allow you to average the concentrations by the hour across all days.
2. Group and Average Data by Hour: Next, you will need to group the data by the extracted hour and calculate the average concentration for each hour. This step is crucial for visualizing the diurnal pattern.
3. Plotting: Use the averaged data to plot the diurnal patterns for NOx and SO2. You can use the "plot" function for this, setting the x-axis to the hours of the day and the y-axis to the average concentrations.

References for further exploration:

• Refer to the documentation of "datetime" and "hour" to learn how to extract hours from timestamps: https://www.mathworks.com/help/matlab/ref/datetime.html
• For details on working with timetables and performing operations like grouping and averaging, see: https://www.mathworks.com/help/matlab/timetables.html
• To improve your plots, look into the plot function documentation: https://www.mathworks.com/help/matlab/ref/plot.html

Hope this helps!