Displaying 3 results from an estimated 3 matches for "dataframeb".
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dataframes
2009 Jul 08
3
matching each row
I have two dataframes, the first column of each dataframe is a unique id
number (the rest of the columns are data variables).
I would like to figure out how many times each id number appears in each
dataframe.
So far I can use:
length( match (dataframeA$unique.id[1], dataframeB$unique.id) )
but this only works on each row of dataframe A one-at-a-time.
I would like to do this for all of the rows in dataframe A, and then put the
results in a new variable: dataframeA$count
I'm new to R, so please be patient with me!
Sorry if this question has already been answere...
2010 Feb 01
3
merging data frames gives all NAs
Dear kind R helpers,
I have a vector of runway names in rwy ("31R", "31L",... the number is
user selectable)
arrgnd is a data frame with data for all flights and all runways, with a
Runway column.
I am trying to subset arrgnd into a dat frame for each selected runway,
and then combine them back together using the following code:
for (j in 1:nr) { # nr = number of
2009 Jul 09
2
How to Populate List
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I have two dataframes, the first column of each dataframe is a unique id
number (the rest of the columns are data variables).
I would like to figure out how many times each id number appears in each
dataframe.
So far I can use:
length( match (dataframeA$unique.id[1], dataframeB$unique.id) )
but this only works on each row of dataframe A one-at-a-time.
I would like to do this for all of the rows in dataframe A, and then put the
results in a new variable: dataframeA$count
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Sorry if this question has already been answered, my search of the archiv...