Question

两个问题使我感到困惑：

如何在R控制台中下载'xml'文件？
我想通过'S4 class'制作一个R pcakage，但很多功能我

仍然不知道，比如如何设置变量环境'new.env'et

al;我掌握的是一些基本功能;因此，可以提出任何关于

如何在'S4'类中编写R函数，并将它们集成到一个包中？

问题1如下：

我想在

“http://www.broadinstitute.org/gsea/downloads.jsp”

and the filename is 'msigdb_v5.0.xml' .

我不想在我的计算机中下载该文件，然后通过'XML'包解析它;

我尝试过如下：

Method 1:  

    download.file('http://www.broadinstitute.org/gsea/downloads.jsp','msigdb_v5.0.xml')

It showed :

    trying URL 'http://www.broadinstitute.org/gsea/downloads.jsp'

    Content type 'text/html' length 5070 bytes

    opened URL

    downloaded 5070 bytes

Method 2： 

    library(XML)

    path="http://www.broadinstitute.org/gsea/msigdb/download_file.jsp?

    filePath=/resources/msigdb/5.0/msigdb_v5.0.xml"

    file=xmlParse(path)

It showed error:

    Input is not proper UTF-8, indicate encoding !

    Bytes: 0xA9 0x20 0x32 0x30

    Opening and ending tag mismatch: div line 68 and a

    Entity 'nbsp' not defined

    Entity 'nbsp' not defined

    Entity 'nbsp' not defined

    Entity 'nbsp' not defined

    Opening and ending tag mismatch: body line 34 and div

    Opening and ending tag mismatch: html line 25 and body

    Extra content at the end of the document

    Error: 1: Input is not proper UTF-8, indicate encoding !

               Bytes: 0xA9 0x20 0x32 0x30

           2: Opening and ending tag mismatch: div line 68 and a

           3: Entity 'nbsp' not defined

           4: Entity 'nbsp' not defined

           5: Entity 'nbsp' not defined

           6: Entity 'nbsp' not defined

           7: Opening and ending tag mismatch: body line 34 and div

           8: Opening and ending tag mismatch: html line 25 and body

           9: Extra content at the end of the document

Method 3.

     library(RCurl)

     path='http://www.broadinstitute.org/gsea/msigdb/download_file.jsp?

     filePath=/resources/msigdb/5.0/msigdb_v5.0.xml'

     readHTMLTable(path,encoding="UTF-8")

  also,method 3 was error again!

在R中下载xml文件以及如何在S5类中编写R包？

0 个答案: