Certainly not a homework question. Elementary questions do not necessarily
indicate that one is a student! Always learning...

Dr Conor Ryan


On 28 September 2013 11:39, Patrick Burns <pburns@pburns.seanet.com> wrote:

> On 27/09/2013 21:01, Bert Gunter wrote:
>
>> On Fri, Sep 27, 2013 at 12:44 PM, Sarah Goslee <sarah.goslee@gmail.com>
>> wrote:
>>
>>> It's a straightforward trigonometry problem, isn't it?
>>>
>>
>> Indeed! (  (r,theta) to (x,y) coordinates  ) . So I wonder if this is
>> a homework problem. If so, the OP should note that we try not to do
>> homework here.
>>
>
> So that would make it unanimous that everyone here is trying
> not to do homework.
>
> Pat
>
>
>
>> Cheers,
>> Bert
>>
>>>
>>> On Fri, Sep 27, 2013 at 2:56 PM, Conor Ryan <miolmor@gmail.com> wrote:
>>>
>>>> I am trying to plot points on a map for each ship locations (lat/long),
>>>> where
>>>> each point is a line whose angle (degrees) denotes ships heading and
>>>> whose
>>>> line length denotes it's speed. Unfortunately arrows(); p.arrows
>>>> (sfsmisc)
>>>> and ms.arrows (TeachingDemos) require start and end coordinates but I
>>>> only
>>>> have a single coordinate and an angle to work with. Can you suggest any
>>>> other packages or commands that might allow me to plot this?
>>>> Alternatively,
>>>> can anyone suggest a method of making 'angle' a vector quantity when
>>>> using
>>>> the arrows function? Any advice would be much appreciated!
>>>>
>>>>
>>> --
>>> Sarah Goslee
>>> http://www.**functionaldiversity.org<http://www.functionaldiversity.org>
>>>
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>>> and provide commented, minimal, self-contained, reproducible code.
>>>
>>
>>
>>
>>
> --
> Patrick Burns
> pburns@pburns.seanet.com
> twitter: @burnsstat @portfolioprobe
> http://www.portfolioprobe.com/**blog <http://www.portfolioprobe.com/blog>
> http://www.burns-stat.com
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>
>
> ______________________________**________________
> R-help@r-project.org mailing list
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> PLEASE do read the posting guide http://www.R-project.org/**
> posting-guide.html <http://www.R-project.org/posting-guide.html>
> and provide commented, minimal, self-contained, reproducible code.
>

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