DSM - mexican dolphins example

[chaona phiri]

Hello,

Am learning how to perform density surface modelling in R so I tried to run the Mexican dolphins example from; https://examples.distancesampling.org/dsm-line-dolphins/mexico-analysis.html 

However, I am getting the following error - 

> data(mexdolphins)
Warning message:
In data(mexdolphins) : data set ‘mexdolphins’ not found

Is this data set no longer available in R? How Else can I run and learn from this example?

Chaona

[Eric Rexstad]

Chaona

You must first load the dsm​ library, where the dataset is contained.

library(dsm)

data(mexdolphins)

However, having said this, when I run the two commands above, I do not get the dataset loaded into my global environment, using dsm version 2.3.3

If you have the same problem I did, you could access this dataset directly from Github at this location

https://github.com/DistanceDevelopment/dsm/tree/master/data

and download the .rda file and load into the global environment.

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Subject: [distance-sampling] DSM - mexican dolphins example

 

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Subject: [distance-sampling] DSM - mexican dolphins example

 

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[Len Thomas]

Hello Chaona and Eric,

I tried to reproduce this problem using dsm 2.3.3 (the latest version on CRAN),
and could not. Below is a copy-paste from my R console. As you can see, when I
type
data(mexdolphins)
I get the data frames disttdata, obsdata, preddata and segdata

I am mystified why you are not, if you are using dsm 2.3.3. Perhaps we can
correspond off-list on this, and post to the list once we have a solution?

With best wishes, Len


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> ls()
character(0)
> library(dsm)
Loading required package: mgcv
Loading required package: nlme
This is mgcv 1.8-41. For overview type 'help("mgcv-package")'.
Loading required package: mrds
This is mrds 2.2.7
Built: R 4.2.1; ; 2022-10-09 02:09:11 UTC; windows
Loading required package: numDeriv
This is dsm 2.3.3
Built: R 4.2.2; ; 2023-01-12 05:30:14 UTC; windows
> data(mexdolphins)
>
> ls()
[1] "distdata" "obsdata" "preddata" "segdata"
>

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[chaona phiri]

Thank you both, I have managed now. The issue was the version of dsm which couldn't load because I had not updated the vctrs package. Sorted now.

Thanks

Chaona 

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