[R] Polygon

[Steven Yen]

Thanks!!! It did wonders.
Steven

On 10/3/2018 9:39 AM, David Winsemius wrote:
>> On Oct 2, 2018, at 5:50 PM, Steven Yen <styen using ntu.edu.tw> wrote:
>>
>> Great. Thanks! It did wonders.
>> 1. Is there a way to suppress the obvious tick stops (-3,-2,-1,0,1,2,3)
>> and mark only the ticks -1.96 and 1.96.
>> 2. Better yet, to draw vertical lines at x = -1.96 and x = 1.96.
>> Thanks.
> Read ?plot.default
>
> Then add xaxt="n" to the arguments to curve, ... and afterwards:
>
> axis( 1, at=c(-1.96, 1.96),lab=c(-1.96, 1.96) )
> abline( v= c(-1.96, 1.96) )
>
> --
>> Steven
>>
>> On 10/3/2018 12:51 AM, Rui Barradas wrote:
>>> Hello,
>>>
>>> Continue with
>>>
>>>
>>> polygon(-rev(cord.x), rev(cord.y), col = 'skyblue')
>>>
>>>
>>> Hope this helps,
>>>
>>> Rui Barradas
>>>
>>> Às 17:25 de 02/10/2018, Steven Yen escreveu:
>>>> Can someone help me with polygon. The following codes are self-runnable
>>>> and mark a shaded area under the standard normal curve in the x-range
>>>> (-3,-1).
>>>> Is there a way to also mark the area in (1,3), at the same time.
>>>> That is, I want shaded areas in both tails. Thank you...
>>>>
>>>> ===
>>>> # Create data for the area to shade
>>>> cord.x <- c(-3,seq(-3,-1,0.01),-1)
>>>> cord.y <- c(0,dnorm(seq(-3,-1,0.01)),0)
>>>>
>>>> # Make a curve
>>>> curve(dnorm(x,0,1), xlim=c(-3,3), main='Standard Normal')
>>>>
>>>> # Add the shaded area.
>>>> polygon(cord.x,cord.y,col='skyblue')
>>>>
>> -- 
>> styen using ntu.edu.tw (S.T. Yen)
>>
>>
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>>
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>> 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
>
>
>
>
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>

-- 
styen using ntu.edu.tw (S.T. Yen)


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