R help - Sep 2010 - Using feather.plot to try and generate a stick plot of current velocity data (and having issues)

Hello All,

 

I am attempting to use the feather.plot function from the plotrix
package to graph current velocity data as I have speed and direction.  I
let "r" be the first 10 rows of current speed data and
"theta" be the
first 10 rows of directional data in radians.  I had tried this with 10
measurements, but keep getting the following error message:

 

 
> feather.plot(r,theta,1:10,yref=0,use.arrows=FALSE, fp.type="m")
 

Error in segments(xpos, yref, xpos + x, y, ...) : invalid third argument

 

My goal was to trouble shoot this smaller data set and see if I could
ramp up to few thousand entries to basically generate a stick plot of
current flow data.  Curious if I was doing anything obviously wrong with
my arguments or if I should be using an entirely different function.

 

 

Thanks for any guidance

Eddie Hughes


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On 09/15/2010 01:29 PM, Hughes, Ed wrote:
> Hello All,
>
>
>
> I am attempting to use the feather.plot function from the plotrix
> package to graph current velocity data as I have speed and direction.  I
> let "r" be the first 10 rows of current speed data and
"theta" be the
> first 10 rows of directional data in radians.  I had tried this with 10
> measurements, but keep getting the following error message:
>
>
>
>
>
>> feather.plot(r,theta,1:10,yref=0,use.arrows=FALSE,
fp.type="m")
>
>
>
> Error in segments(xpos, yref, xpos + x, y, ...) : invalid third argument
>
>
>
> My goal was to trouble shoot this smaller data set and see if I could
> ramp up to few thousand entries to basically generate a stick plot of
> current flow data.  Curious if I was doing anything obviously wrong with
> my arguments or if I should be using an entirely different function.
>
Hi Eddie,
I think the problem is with the format of your data. I tried a whole 
bunch of variants of vectors, matrices and data frames and couldn't 
reproduce your error. Could you post a sample data set that causes this 
problem? Thanks.

Jim

Hi all,
After a bit of offlist correspondence, the problem with feather.plot was 
found to be with the input data format (lists) and the particular data 
revealed a bug in the function. A fix for the bug and a warning about 
lists as input will be in the next version of plotrix (3.0-1).

Jim