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The usage of ls("package:hgu95av2.db") shown in AnnotationDbi.pdf

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Peng Yu ▴ 940

@peng-yu-3586

Last seen 9.6 years ago

Hi, in AnnotationDbi.pdf, it gives the following example code. I don't quite understand the second command. Does it mean that 'hgu95av2.db' is in the namespace of package? What does ":" mean? library("hgu95av2.db") ls("package:hgu95av2.db") Regards, Peng

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ADD COMMENT • link updated 14.7 years ago by Sean Davis 21k • written 14.7 years ago by Peng Yu ▴ 940

score 0 · Answer 1 · 2009-08-20

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Sean Davis 21k

@sean-davis-490

Last seen 3 months ago

United States

On Thu, Aug 20, 2009 at 6:05 PM, Peng Yu <pengyu.ut@gmail.com> wrote: > Hi, > > in AnnotationDbi.pdf, it gives the following example code. I don't > quite understand the second command. Does it mean that 'hgu95av2.db' > is in the namespace of package? What does ":" mean? > > library("hgu95av2.db") > ls("package:hgu95av2.db") > This is a way of specifying the environment in which to look for R objects. See the help page for search() for details about what this represents. Also, you can try search() in your workspace to get an idea of how ls() and search() work together. Sean [[alternative HTML version deleted]]

ADD COMMENT • link 14.7 years ago Sean Davis 21k

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On Thu, Aug 20, 2009 at 5:14 PM, Sean Davis<seandavi at="" gmail.com=""> wrote: > > > On Thu, Aug 20, 2009 at 6:05 PM, Peng Yu <pengyu.ut at="" gmail.com=""> wrote: >> >> Hi, >> >> in AnnotationDbi.pdf, it gives the following example code. I don't >> quite understand the second command. Does it mean that 'hgu95av2.db' >> is in the namespace of package? What does ":" mean? >> >> library("hgu95av2.db") >> ls("package:hgu95av2.db") > > This is a way of specifying the environment in which to look for R objects. > See the help page for search() for details about what this represents. > Also, you can try search() in your workspace to get an idea of how ls() and > search() work together. By 'environment', you mean something similiar to 'namespace' in C++, right? Sorry that I have to relate a concept of R to a concept in C++, because C++ is the language that I am most familiar with. Regards, Peng

ADD REPLY • link 14.7 years ago Peng Yu ▴ 940

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On Thu, Aug 20, 2009 at 7:40 PM, Peng Yu <pengyu.ut@gmail.com> wrote: > On Thu, Aug 20, 2009 at 5:14 PM, Sean Davis<seandavi@gmail.com> wrote: > > > > > > On Thu, Aug 20, 2009 at 6:05 PM, Peng Yu <pengyu.ut@gmail.com> wrote: > >> > >> Hi, > >> > >> in AnnotationDbi.pdf, it gives the following example code. I don't > >> quite understand the second command. Does it mean that 'hgu95av2.db' > >> is in the namespace of package? What does ":" mean? > >> > >> library("hgu95av2.db") > >> ls("package:hgu95av2.db") > > > > This is a way of specifying the environment in which to look for R > objects. > > See the help page for search() for details about what this represents. > > Also, you can try search() in your workspace to get an idea of how ls() > and > > search() work together. > > By 'environment', you mean something similiar to 'namespace' in C++, > right? Sorry that I have to relate a concept of R to a concept in C++, > because C++ is the language that I am most familiar with. > Yes, if that helps. Sean [[alternative HTML version deleted]]

ADD REPLY • link 14.7 years ago Sean Davis 21k