fix: backward dispersion #1
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The duration is computed as the difference between the start and end times. If the start time is after the end time, the duration is already negative, so we don't need to prepend a "-" to it or we have a double negative before the duration value and HYSPLIT crashes.
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This addresses rich-iannone#81, and also could be considered to address rich-iannone#66.
Basically, there were 2 really small errors that made the logic of running backwards dispersion models not work.
For starters, the
run_modelfunction has a hardcoded 'forward' parameter, so no matter the direction specified inadd_dispersion_params, thehysplit_dispersionfunction always received 'forward' as the parameter. This is fixedin commit caead2f.
Second, the
add_dispersion_paramsfunction has nodurationparameter. The value ofdurationthat is passed ontohysplit_dispersionis computed by the difference in hours between start_time and end_time:https://github.com/rich-iannone/splitr/blob/44851122514e1296291f0e9b082326717549715f/R/run_model.R#L51
In a backwards model, the
end_timeis before thestart_time, so this variable takes negative values.When writing the CONTROL file, however, there is an ifelse clause that prepends a '-' to the duration value. In the case of an already negative value, this writes a line with --duration, leading to a faulty CONTROL file that HYSPLIT doesn't accept and it just doesn't run. Removing the ifelse clause seems to work and is what I did in d4ca419.