dataframe_开发者

Loop over rows of dataframe applying function with if-statement

I\'m new to R and I\'m trying to sum 2 columns of开发者_如何学JAVA a given dataframe, if both the elements to be summed satisfy a given condition. To make things clear, what I want to do is:[详细]

2023-03-15 23:17 分类：问答

Converting an ftable (contingency table) to a dataframe in R

I am generating an ftable (by running ftable on the results of a xtabs command) and I am getting the following.[详细]

2023-03-15 14:24 分类：问答

R plot frequency of strings with specific pattern

Given a data frame with a column that contains strings. I would like to plot the frequency of strings that bear a certain pattern. For example[详细]

2023-03-15 07:10 分类：问答

model.matrix generates fewer rows than original data.frame

Why doesn\'t a model matrix necessarily have the same number of rows as the data frame? mergem = model.matrix(as.formula(paste(response, \'~ .\')), data=mer开发者_如何学运维gef)[详细]

2023-03-14 15:41 分类：问答

Override [.data.frame to drop unused factor levels by default

The issue of dropping unused factor levels when subsetting has come up before. Common solutions include using character vectors where possible by declaring[详细]

2023-03-14 02:10 分类：问答

making a complex yaml from R

I am trying to make yaml format file from R. I know there is a package for such a 开发者_StackOverflow社区job, but its example is so simple and my object is a bit more tricky !![详细]

2023-03-13 18:26 分类：问答

R: combine lists of interest

I have a list like df_all (see below). A = matrix( ce开发者_Python百科iling(10*runif(8)), nrow=4)[详细]

2023-03-13 10:32 分类：问答

Reshape data from long to semi-wide in R

I have data in which each participant made 3 judgments on each of 9 objects (27 judgments).The 9 objects varied in a 3x3 design (within subjects) so there are 2 factors.[详细]

2023-03-12 08:36 分类：问答