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How to plot 8640 datapoints over a 1 day on a second by second basis (i.e. 86400 seconds)

Asked by Akash Menon on 18 Oct 2018
Latest activity Answered by Akash Menon on 19 Oct 2018
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Hi there community!
I wanted to build a signal on signal builder on Simulink. I have about 8640 datapoints that were measured over 10 second intervals for 1 day. I want to present the measured data as a continuous signal spread across the whole duration on a second by second basis- meaning the x-axis time range must be from 0-86400 seconds. How do I go about it? As of now I'm only able to plot the data over the 8640 range on the x-axis.
How to I essentially 'stretch' this data to fit the required range? If if only change the x-axis range on signal builder it doesn't work as it doesn't spread the data.
Any help would be great! Many thanks!!

  6 Comments

Basically you could just change the x values:
mydata=randi(10,864,1);
x=1:864;
x=x*10;
plot(x,mydata)
However 8640 datapoints will be too many to be displayed correctly.
Was the corresponding time not recorded? If not, and you are 100% certain that there is no missing data or significant variation in the sampling frequency, then you can just do as @Dennis suggested and build your own x-vector, although I would suggest using duration or datetime format so that the units are embedded.
x = days(0):seconds(10):days(1)
The time was recorded but its like this (10 second intervals): Nope there is no missing data. There are 8640 datapoints for the whole day- one recording taken every 10 seconds.

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1 Answer

Answer by Akash Menon on 19 Oct 2018
 Accepted Answer

%%Plotting the measured power signals
mydata=xlsread('pow_demand_test.xlsx');
% Adjusting the x-axis vector (86400 datapoints)
x=1:8640;
x=x*10;
% Plot
plot(x,mydata)
Thanks dennis it worked!Thanks for the tip Jonas- had some issues with implementing that x-scale because the data did not show up. Will have to look more into that about how to fix that. Now I just need to figure out how to import this into signal builder on Simulink.

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