Message-ID: <9EE60F8C-4734-458B-911E-4317BAE5B736@auckland.ac.nz>
Date: 2009-11-02T18:59:44Z
From: Rolf Turner
Subject: using exists with coef from an arima fit
In-Reply-To: <7acc7a990911012027q8a1004fw532de6847d3dc9ee@mail.gmail.com>
On 2/11/2009, at 5:27 PM, Erin Hodgess wrote:
> Dear R People:
>
> I have the output from an arima model fit in an object xxx.
>
> I want to verify that the ma1 coefficient is there, so I did the
> following:
>> xxx$coef
> ar1 ar2 ma1 intercept
> 1.3841297 -0.4985667 -0.9999996 -0.1091657
>> str(xxx$coef)
> Named num [1:4] 1.384 -0.499 -1 -0.109
> - attr(*, "names")= chr [1:4] "ar1" "ar2" "ma1" "intercept"
>> exists('xxx$coef["ma1"]')
> [1] FALSE
>>
>
> Other than using xxx$coef[3], is there another way to check this,
> please?
(1) as.logical(length(grep("ma1",names(xxx$coef)))
(2) length(grep("ma1",names(xxx$coef))) != 0
(3) with(as.list(xxx$coef),exists("ma1"))
spring to mind.
cheers,
Rolf
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