问题
I am creating a dataframe using this code:
df <- data.frame(dbGetQuery(con, paste('select * from test')))
Which results in this:
UID BuildingCode AccessTime
1 123456 BUILD-1 2014-06-16 07:00:00
2 364952 BUILD-2 2014-06-15 08:00:00
3 95865 BUILD-1 2014-06-06 09:50:00
I am then trying to remove the row names (1, 2, 3, etc) as suggested here by using this code:
rownames(df) <- NULL
But then when I print out df
it still displays the row names. Is there a way to not include the row names when creating the data frame? I found a suggestion about row.name = FALSE
but when I tried it I just got errors (I might have placed it in the wrong place).
EDIT: What I want to do is convert the dateframe to a HTML table and I don't want the row name to be present in the table.
回答1:
You have successfully removed the row names. The print.data.frame
method just shows the row numbers if no row names are present.
df1 <- data.frame(values = rnorm(3), group = letters[1:3],
row.names = paste0("RowName", 1:3))
print(df1)
# values group
#RowName1 -1.469809 a
#RowName2 -1.164943 b
#RowName3 0.899430 c
rownames(df1) <- NULL
print(df1)
# values group
#1 -1.469809 a
#2 -1.164943 b
#3 0.899430 c
You can suppress printing the row names and numbers in print.data.frame
with the argument row.names
as FALSE
.
print(df1, row.names = FALSE)
# values group
# -1.4345829 d
# 0.2182768 e
# -0.2855440 f
Edit: As written in the comments, you want to convert this to HTML. From the xtable
and print.xtable
documentation, you can see that the argument include.rownames
will do the trick.
library("xtable")
print(xtable(df1), type="html", include.rownames = FALSE)
#<!-- html table generated in R 3.1.0 by xtable 1.7-3 package -->
#<!-- Thu Jun 26 12:50:17 2014 -->
#<TABLE border=1>
#<TR> <TH> values </TH> <TH> group </TH> </TR>
#<TR> <TD align="right"> -0.34 </TD> <TD> a </TD> </TR>
#<TR> <TD align="right"> -1.04 </TD> <TD> b </TD> </TR>
#<TR> <TD align="right"> -0.48 </TD> <TD> c </TD> </TR>
#</TABLE>
回答2:
Yes I know it is over half a year later and a tad late, BUT
row.names(df) <- NULL
does work. For me at least :-)
And if you have important information in row.names like dates for example, what I do is just :
df$Dates <- as.Date(row.names(df))
This will add a new column on the end but if you want it at the beginning of your data frame
df <- df[,c(7,1,2,3,4,5,6,...)]
Hope this helps those from Google :)
回答3:
Recently I had the same problem when using htmlTable() (‘htmlTable’ package) and I found a simpler solution: convert the data frame to a matrix with as.matrix():
htmlTable(as.matrix(df))
And be sure that the rownames are just indices. as.matrix() conservs the same columnames. That's it.
UPDATE
Following the comment of @DMR, I did't notice that htmlTable()
has the parameter rnames = FALSE
for cases like this. So a better answer would be:
htmlTable(df, rnames = FALSE)
回答4:
If you want to format your table via kable
, you can use row.names = F
kable(df, row.names = F)
来源:https://stackoverflow.com/questions/24428051/removing-display-of-row-names-from-data-frame