I have a concern about the way Vensim displays the horizontal scale.
I generated a simulation run and used the custom graph option to displays real data and simulated data. The simulation time is from 2005 to 2050 represented as Time 0 to 540.
For displaying the graph I selected the plot to show from 0 to 132 months.
Why do Vesim show the graph as 2 scale divisions for the 1st year and then 1 scale division per year there after?
Please find the plot attached.
Thank you
George
Time Scales of Plots
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Time Scales of Plots
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- Installed_capacity_calibrations_to_2016.PNG (22.78 KiB) Viewed 2315 times
Re: Time Scales of Plots
You have 6 divisions of 11 years here, which is a little unnatural because that means 22 month intervals. However, the labels are misleading, because they don't indicate the lack of precision - those dates should be Oct. 2006, Aug 2008, June 2010, ...
I'll see what we can do to improve the display. In the meantime, I'd either show 11 intervals or pad the chart with extra years to make things work out.
I'll see what we can do to improve the display. In the meantime, I'd either show 11 intervals or pad the chart with extra years to make things work out.
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Re: Time Scales of Plots
Thanks for the reply Tom.
I redid the simulations with the END TIME to be 126 months and the plot is a bit better but something still seems amiss
This large print seems to show beginning and ending of years but still 2008 and 2011 has only one scale division.
My timestep for the model is 0.015625.
As you mentioned, it might not be a precision issue but it is hard to convince a mathematician (My thesis supervisor) about these scales
Thank you
George
I redid the simulations with the END TIME to be 126 months and the plot is a bit better but something still seems amiss
This large print seems to show beginning and ending of years but still 2008 and 2011 has only one scale division.
My timestep for the model is 0.015625.
As you mentioned, it might not be a precision issue but it is hard to convince a mathematician (My thesis supervisor) about these scales
Thank you
George
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- Installed_capacity_calibrations_to_2016_using 126 months_large.PNG (42.35 KiB) Viewed 2311 times
Re: Time Scales of Plots
It's not an internal precision issue; it's that the label is apparently using the integer truncation of whatever the real date is.
126 won't work because 126/6 = 21 months.
144 months with 6 divisions or 132 with 11 divisions should work though.
126 won't work because 126/6 = 21 months.
144 months with 6 divisions or 132 with 11 divisions should work though.
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Re: Time Scales of Plots
Thanks for this Tom.
I assumed it was because of the real data (lots of data point are not populated)
I will try it to see.
I assumed it was because of the real data (lots of data point are not populated)
I will try it to see.