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convert 400 numeric variables to categorical together

David L Carlson 
Assuming the 400 numeric variables are integers this will be simpler if you
can identify the columns to be converted to factors as a block of column
numbers (e.g. 1:400, or 401:800)

# Create some data

X <- data.frame(matrix(nrow=20, ncol=20))
for (i in 1:10) X[,i] <- round(runif(20, .5, 5.5), 0)
for (i in 11:20) X[,i] <- rnorm(20)     
str(X) # structure of X

# convert numbers to factors for the first 10 columns

X2 <- X
for (i in 1:10) X2[,i] <- factor(X[,i])
str(X2)

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David L Carlson
Associate Professor of Anthropology
Texas A&M University
College Station, TX 77843-4352

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ya convert 400 numeric variables to categorical together May 8 John Kane convert 400 numeric variables to categorical together May 8 David L Carlson convert 400 numeric variables to categorical together May 8