Using R lines() to show sunrise and sunset
Make a dummy variable using an if test. Ifelse(as.numeric(hour(time))<11,df$rise=0,df$rise=1) Then you could use filter() to split the dataset into two parts, or you could use pivot_wider(). Tim -----Original Message----- From: R-help <r-help-bounces at r-project.org> On Behalf Of Gregory Coats via R-help Sent: Monday, July 18, 2022 8:18 PM To: David Winsemius <dwinsemius at comcast.net> Cc: Gregory Coats via R-help <r-help at r-project.org> Subject: Re: [R] Using R lines() to show sunrise and sunset [External Email] Thanks. Yes, I can follow https://urldefense.proofpoint.com/v2/url?u=https-3A__www.stat.berkeley.edu_-7Es133_dates.html&d=DwIFaQ&c=sJ6xIWYx-zLMB3EPkvcnVg&r=9PEhQh2kVeAsRzsn7AkP-g&m=cc9Eq3DGpCl6kcfJbKVLDsJ9i6TKk7SF79PHaRy8-GoQctAlVTXhQIVEHHwO08Q8&s=ym6pjfQa0pw3I4kXT4_gM3iUDXXy52lWTJkwCbXi2NM&e= Dates and Times in R But my problem is, How to direct R to accept the first computed value as a sunrise, and the second computed values as a sunset? Greg Coats 571-423-9847
On Jul 18, 2022, at 7:58 PM, David Winsemius <dwinsemius at comcast.net> wrote: The first thought it to do is make sure you have the data in POSIXct format for the date times. Sent from my iPhone
On Jul 18, 2022, at 6:51 PM, Gregory Coats via R-help <r-help at r-project.org> wrote: ?I compiled a program on my Apple MacBook that takes as inputs Year and Month and Day Latitude and Longitude And then computes these two outputs Sunrise Year-Month-Day Hour:Minute:Second Sunset Year-Month-Day Hour:Minute:Second It automatically handles Daylight Savings Time. A typical input, followed by the automatically computed outputs looks likes this. ./sunrise_05 2022 01 1 38.8586314239524 77.0512533684194 2022-01-01 07:26:45 2022-01-01 16:57:07 ./sunrise_05 2022 01 2 38.8586314239524 77.0512533684194 2022-01-02 07:26:52 2022-01-02 16:57:56 I want to use R?s lines() command to show the sunrise and sunset times for the year 2012. How do I tell R that the first computed output is sunrise, and the second computer output is sunset? Greg Coats [[alternative HTML version deleted]]
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