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  • Get and Set Column/Row Names for Data Frames


    row.names(x)
    row.names(x) <- value

    rownames(x, do.NULL = TRUE, prefix = "row")

    rownames(x) <- value

    colnames(x, do.NULL = TRUE, prefix = "col")

    colnames(x) <- value

    ####################################
    results <- data.frame(matrix(c(1,2,3,4),nrow=2,ncol=2))
    rownames(results) <- c("a","b")
    colnames(results) <- c("c","d")
    attr(results,"title") <- "aaa"
    results

    #####################################

    > colnames(data)
    [1] "col1" "col2" "col3"
    >
    > # set the name of column 2
    > colnames(data)[2] <- 'column 2'
    > colnames(data)
    [1] "col1"     "column 2" "col3"
    >     
    > # you can assign all of the columns at once, if you wish
    > colnames(data) <- c( 'col 1', 'col 2', 'col 3')
    > colnames(data)
    [1] "col 1" "col 2" "col 3"
    > str(data)
    'data.frame': 2 obs. of  3 variables:
    $ col 1: Factor w/ 2 levels "1,233","470": 1 2
    $ col 2: Factor w/ 2 levels " $1,113.22"," $12.79": 2 1
    $ col 3: Factor w/ 2 levels " $0.12"," $1,333,233.17": 2 1


    REF:
    https://stackoverflow.com/questions/2281353/row-names-column-names-in-r

    http://www.astrostatistics.psu.edu/su07/R/html/base/html/colnames.html

    http://earlh.com/blog/2009/06/29/column-names-of-r-data-frames/

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  • 原文地址:https://www.cnblogs.com/emanlee/p/7636060.html
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