> On Apr 22, 2018, at 4:50 PM, bbb_...@verizon.net wrote:
>
>
> Hi Sarah
>
> Thank you very much for your pointers.
>
> Is there a way to specify the date string as POSIXct when reading in?
Please read the Arguments and Details sections of the help page for read.csv
with particular attention to the colClasses argument options.
--
David.
>
> I have tried the following (very inelegant way) and still have no luck.
>
> --- Begin Code ---
>
> # 1st read in the spreadsheet with stringsAsFactors set to FALSE
>
>> abc <- read.csv("gntr1.csv", header=TRUE, stringsAsFactors=FALSE)
>> abc
> code tasks.labels start end depends done
> 1 101 task 1 2018-04-01 2018-04-15 101 100
> 2 102 task2 2018-04-15 2018-05-31 101 50
> 3 103 task 3 2018-06-01 2018-06-30 102 0
>
>
> # Next convert the date strings to POSIXct format:
> # The Idea here is to take each of the individual columns in the spreadsheet
> # and convert them to the required format and then assemble the dataframe
> back again:
>
>
>> c1d1 <- abc$tasks.labels
>> c1d1
> [1] "task 1" "task2" "task 3"
>> c2d1 <- as.POSIXct(abc$start)
>> c2d1
> [1] "2018-04-01 EDT" "2018-04-15 EDT" "2018-06-01 EDT"
>> c3d1 <- as.POSIXct(abc$end)
>> c3d1
> [1] "2018-04-15 EDT" "2018-05-31 EDT" "2018-06-30 EDT"
>> cdfg <- data.frame(c1d1,c2d1,c3d1)
>> cdfg
> c1d1 c2d1 c3d1
> 1 task 1 2018-04-01 2018-04-15
> 2 task2 2018-04-15 2018-05-31
> 3 task 3 2018-06-01 2018-06-30
>
>
> # But still no luck !
>
>> gantt.chart(cdfg)
> Error in `$<-.data.frame`(`*tmp*`, "priorities", value = numeric(0)) :
> replacement has 0 rows, data has 3
>> str(cdfg)
> 'data.frame': 3 obs. of 3 variables:
> $ c1d1: Factor w/ 3 levels "task 1","task 3",..: 1 3 2
> $ c2d1: POSIXct, format: "2018-04-01" "2018-04-15" "2018-06-01"
> $ c3d1: POSIXct, format: "2018-04-15" "2018-05-31" "2018-06-30"
>> dput(cdfg)
> structure(list(c1d1 = structure(c(1L, 3L, 2L), .Label = c("task 1",
> "task 3", "task2"), class = "factor"), c2d1 = structure(c(1522555200,
> 1523764800, 1527825600), class = c("POSIXct", "POSIXt"), tzone = ""),
> c3d1 = structure(c(1523764800, 1527739200, 1530331200), class =
> c("POSIXct",
> "POSIXt"), tzone = "")), .Names = c("c1d1", "c2d1", "c3d1"
> ), row.names = c(NA, -3L), class = "data.frame")
>>
>
> ----- End Code ---
>
>
> Thank you and Regards
> Indr
>
>
>
>
>
> -----Original Message-----
> From: Sarah Goslee <sarah.gos...@gmail.com>
> To: bbb_aaa <bbb_...@verizon.net>
> Cc: David Winsemius <dwinsem...@comcast.net>; r-help <r-help@r-project.org>
> Sent: Sun, Apr 22, 2018 6:30 pm
> Subject: Re: [R] Gantt Chart Using Plotrix
>
> Hi,
>
> The help file for gantt.chart states that dates must be in POSIXct
> format, and the example shows how to do that. There's no reason that I
> can see that you can't use a data frame as input to gantt.chart, but
> you need to be very careful that your data frame matches the correct
> format. I bet also that your character fields were imported as
> factors, because you didn't specify not to.
>
> Try running the first couple lines of the example code, then compare
>
> str(abc)
>
> with
>
> str(gantt.info)
>
> and adjust the format of your dataset as necessary.
>
> If you still can't figure it out, then use dput(abc) to provide a
> reproducible example, and submit that to the list. We can't tell the
> format of the various columns from a copy and paste.
>
> Sarah
>
> On Sun, Apr 22, 2018 at 6:10 PM, <bbb_...@verizon.net> wrote:
>> From the help file for plotrix:
>> " ... x - a list of task labels, start/end times and task priorities as
>> returned by get.gantt.info ..."
>>
>> So I try to create an object that will contain this information.
>>
>> abc <- read.csv("gntr1a.csv")
>>
>> # The above csv file was generated from MS .xlsx file containing the tasks
>> and corresponding dates
>>
>>> abc
>> code tasks.labels start end depends done
>> 1 101 task 1 2018/04/01 2018/04/15 NA 100
>> 2 102 task2 2018/04/15 2018/05/31 101 50
>> 3 103 task 3 2018/06/01 2018/06/30 102 0
>>> gantt.chart(abc)
>> Error in `$<-.data.frame`(`*tmp*`, priorities, value = numeric(0)) :
>> replacement has 0 rows, data has 3
>>>
>>
>> Manually adding the required tasks and dates (as given in the help file
>> example) is not practical for my situation ....
>>
>>
>>
>>
>>
>> -----Original Message-----
>> From: David Winsemius <dwinsem...@comcast.net>
>> To: bbb_aaa <bbb_...@verizon.net>
>> Cc: r-help <r-help@r-project.org>
>> Sent: Sun, Apr 22, 2018 4:31 pm
>> Subject: Re: [R] Gantt Chart Using Plotrix
>>
>>
>>> On Apr 22, 2018, at 11:50 AM, bbb_...@verizon.net wrote:
>>>
>>> Hi
>>>
>>> I am trying to generate a complex Gantt chart using the gantt.chart
>>> function in the plotrix package.
>>>
>>> Ideally I would like to use a spreadsheet to populate the activities
>>> (tasks) and start and end dates that this function expects and then export
>>> the spreadsheet file as a .CSV text file so I can read in this file to
>>> generate the gantt chart. Reading through the help file I have not been
>>> able to see what exactly this spreadsheet should like. The example provided
>>> with the "gantt.chart" function seems to indicate all the information needs
>>> to be hand coded. Because of the complexity of my chart this is not only
>>> very error prone but also is impractical.
>>>
>>> Can anyone help me with this? There is also a "get.gantt.info" function for
>>> creating a gantt object but the help on this is almost next to nothing !
>>>
>>> Any help you can provide on this would be great.
>>>
>>> There is another R package called "plan" which is very user friendly but
>>> for my purpose this doesn't have all the functionality I am looking for.
>>
>> The method to generate the most interest and attention to a question is to
>> post a reproducible example with a clear description of the desired
>> "functionality".
>>
>>>
>>> Thanks
>>> indr
>>>
>>> ______________________________________________
>>> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
>>> https://stat.ethz.ch/mailman/listinfo/r-help
>>> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
>>> and provide commented, minimal, self-contained, reproducible code.
>>
>> David Winsemius
>> Alameda, CA, USA
>>
>> 'Any technology distinguishable from magic is insufficiently advanced.'
>> -Gehm's Corollary to Clarke's Third Law
>>
>
> --
> Sarah Goslee
> http://www.functionaldiversity.org
>
David Winsemius
Alameda, CA, USA
'Any technology distinguishable from magic is insufficiently advanced.'
-Gehm's Corollary to Clarke's Third Law
______________________________________________
R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
