R help - Mar 2015 - check a list that a sublist exists

Hi all,I have a list that has the following fields.
$`80`
[1] "Error in if (fitcass1[[2]] == \"Error\") { : \n? Fehlender
Wert, wo TRUE/FALSE n?tig ist\n"
attr(,"class")
[1] "try-error"
attr(,"condition")
<simpleError in if (fitcass1[[2]] == "Error") {???
print(sprintf("error at fitting gamma distribution with %s periods. Mean %f
%f Sd %f %f",???????? flag, mean1, mean2, sd1, sd2))} else {???
return(fitcass1)}: Fehlender Wert, wo TRUE/FALSE n?tig ist>


$`81`
[1] 0

$`9`
[1] 0

$`79`
$parameters
??????????? pi?????????? mu??? sigma
1 0.9996796725???? 1.654832 127.6542
2 0.0003203275 17183.001125 302.8063

$se
???????? pi.se????? mu.se sigma.se
1 2.113882e-05? 0.1439152 14.22274
2 2.113882e-05 38.3582148????? NaN

$distribution
[1] "gamma"



and so one. The content of each first level sublist are never the same. I want
for each first-level sublist my list has to check fast that the current element
, lets say the 79th has the $parameters.then I would keep only the numbers from
the sublists that have this $parameters inside them and skip all the rest.
I tried something like exists(Mylist[[i]]$parameters) but it does not workI also
tried the is.numeric(Mylist[[i]]$parameters)) but this line fails when the
current sublist does not contain the $parameters field.
Can you please help me sort this out?
RegardsAlex


	[[alternative HTML version deleted]]

Hello, Alaios,

try

is.null( Mylist[[i]]$parameters)

It returns TRUE if your list doesn't have a component named
"parameters"
or if that component contains NULL.

  HtH  --  Gerrit


On Tue, 3 Mar 2015, Alaios via R-help wrote:
> Hi all,I have a list that has the following fields.
> $`80`
> [1] "Error in if (fitcass1[[2]] == \"Error\") { : \n?
Fehlender Wert, wo TRUE/FALSE n?tig ist\n"
> attr(,"class")
> [1] "try-error"
> attr(,"condition")
> <simpleError in if (fitcass1[[2]] == "Error") {???
print(sprintf("error at fitting gamma distribution with %s periods. Mean %f
%f Sd %f %f",???????? flag, mean1, mean2, sd1, sd2))} else {???
return(fitcass1)}: Fehlender Wert, wo TRUE/FALSE n?tig ist>
>
>
> $`81`
> [1] 0
>
> $`9`
> [1] 0
>
> $`79`
> $parameters
> ??????????? pi?????????? mu??? sigma
> 1 0.9996796725???? 1.654832 127.6542
> 2 0.0003203275 17183.001125 302.8063
>
> $se
> ???????? pi.se????? mu.se sigma.se
> 1 2.113882e-05? 0.1439152 14.22274
> 2 2.113882e-05 38.3582148????? NaN
>
> $distribution
> [1] "gamma"
>
>
>
> and so one. The content of each first level sublist are never the same. I
want for each first-level sublist my list has to check fast that the current
element , lets say the 79th has the $parameters.then I would keep only the
numbers from the sublists that have this $parameters inside them and skip all
the rest.
> I tried something like exists(Mylist[[i]]$parameters) but it does not workI
also tried the is.numeric(Mylist[[i]]$parameters)) but this line fails when the
current sublist does not contain the $parameters field.
> Can you please help me sort this out?
> RegardsAlex
>
>
> 	[[alternative HTML version deleted]]
>
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