Indexing Vectors
- x[n] nth element
- x[-n] all but the nth element
- x[1:n] first n elements
- x[-(1:n)] elements from n+1 to the end
- x[c(1,4,2)] specific elements
- x[“name”] element named “name”
- x[x > 3] all elements greater than 3
- x[x > 3 & x < 5] all elements between 3 and 5
- x[x %in% c(“a”,”and”,”the”)] elements in the given set
Indexing Lists
- x[n] list with elements n
- x[[n]] nth element of the list
- x[[“name”]] element of the list named “name”
- x
![name</strong> id.</li> </ul> <h3>Indexing Matrices</h3> <ul> <li><strong>x[i,j]</strong> element at row i, column j</li> <li><strong>x[i,]</strong> row i</li> <li><strong>x[,j]</strong> column j</li> <li><strong>x[,c(1,3)]</strong> columns 1 and 3</li> <li><strong>x["name",]</strong> row named "name"</li> </ul> <h3>Indexing Data Frames</h3> <ul> <li><strong>x[["name"]]</strong> column named "name"</li> <li><strong>x](http://damianmingle.com/wp-content/ql-cache/quicklatex.com-1785f4f73e55a82167d72d1b83f4f9c7_l3.png "Rendered by QuickLaTeX.com")
name id
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Good job, cheers
I know this may be asking a lot, but is it possible that you could put one of these together from Python or Matlab?
Thanks for the resource!
Everyone needs to know this stuff in today’s world… I just can’t make the time.
Where do I ask questions if I want more understanding of what you are writing about?
Very neat blog.Really thank you! Cool.