[R] violin plot help

Jeff Newmiller jdnewmil at dcn.davis.ca.us
Tue May 16 18:30:22 CEST 2017

Please use reply-all or equivalent to keep the list in the conversation. I don't do private online consultation.

Your example suggested you did not know the difference, but your error suggests a completely different expression triggered the error, so all the more reason to give us an example that we can run to trigger the same error. 

Items B and C are recommendations to read the help pages for those syntax elements. You should already have read enough of an introduction to R to have encountered the use of the question mark to bring up the help pages. If not, please do. 
Sent from my phone. Please excuse my brevity.

On May 16, 2017 9:00:09 AM PDT, "Abdelrahman, Omar (RER)" <Omar.Abdelrahman at miamidade.gov> wrote:
>Thanks Jeff. I will send plain text from now on. I am not sure what B
>or C mean; is there a guide that I can reference? I know the difference
>between "=" and "==" , they work the same in Stata and SAS. 
>-----Original Message-----
>From: Jeff Newmiller [mailto:jdnewmil at dcn.davis.ca.us] 
>Sent: Tuesday, May 16, 2017 11:43 AM
>To: r-help at r-project.org; Abdelrahman, Omar (RER)
><Omar.Abdelrahman at miamidade.gov>; 'r-help at r-project.org'
><r-help at r-project.org>
>Subject: Re: [R] violin plot help
>A) the Posting Guide (re plain text only... your emails may be damaged
>by the mailing list if you send html-formatted email... only you can
>solve this by figuring out how to use your email software)
>B) Help on assignment (?`=`)
>C) Help on logical tests (?`==`)
>Sent from my phone. Please excuse my brevity.
>On May 16, 2017 7:06:40 AM PDT, "Abdelrahman, Omar (RER)"
><Omar.Abdelrahman at miamidade.gov> wrote:
>>I am trying to produce multiple violin plots by 3 categorical 
>>variables, each violin representing 1 year worth of data. The
>>Watershed (7 levels: county canals)
>>Geography (5 levels: west; central; east; mouth; bay)
>>Parameter (8 levels: water quality chemical parameters)
>>Year (25 levels: 1992-2017)
>>I want to produce 1 plot for each Parameter-Watershed subdivided into 
>>Geography with a violin for each year. I used facets with the
>>code (not by year):
>>ggplot () +
>>facet_grid (PARAMETER ~Wshed, scales="free_y") +
>>geom_violin (data=merged, aes(x=Geo, y=RESULT))
>>I do not want facets, they crowd the information so it is unreadable.
>>just started with R this week and have not been able to figure out the
>>foreach protocol, or any other loop protocol. I tried to subset the 
>>data to do it iteratively with the following code:
>>subdf<-subset (merged, Wshed = "AC")
>>but got an error: Error: unexpected input in "subdf=subset (merged, 
>>Wshed == ""
>>Any help would be greatly appreciated.
>>Omar Abdelrahman, Biologist II
>>Miami-Dade County, Department of Regulatory and Economic Resources 
>>Division of Environmental Resources Management (DERM) Overtown Transit
>>701 NW 1st Court, 5th Floor
>>Miami, FL 33136-3912
>>(305) 372-6872
>>abdelo at miamidade.gov<mailto:abdelo at miamidade.gov>
>>	[[alternative HTML version deleted]]
>>R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see 
>>PLEASE do read the posting guide
>>and provide commented, minimal, self-contained, reproducible code.

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