Function to Single Column Sort a Matrix or Data Frame
Function to sort a matrix or data frame by the value in a column. On exit the function displays the sorted data. Any NAs in the sort column are sorted to beyond the greatest value. If the function is run as temp <- gx.sort(x, ncol) the sorted data are not displayed, but retained in temp for subsequent use or display.
gx.sort(x, col = 1, reverse = FALSE)
x |
the matrix or data frame to be sorted. |
col |
a column number, the value of which will be used to sort the matrix or data frame |
reverse |
the default is to sort in ascending order of the value in column |
Robert G. Garrett
## Make test data available data(sind) attach(sind) ## Sort data frame sind into ascending order on the value ## of column 4, Zn gx.sort(sind, 4) ## Sort data frame sind into descending order on the value ## of column 4, Zn gx.sort(sind, 4, reverse = TRUE) ## Sort only the geochemical data in data frame sind into ## descending order on the value of column 4, Zn. Note ## that sind[, -c(1:3)] moves the old column 4 to ## position 1 gx.sort(sind[, -c(1:3)], 1, reverse = TRUE) ## Detach test data detach(sind)
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