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Asked: 2026-05-16T00:25:39+00:00

I am passing data from C# to R over a COM interface. When the

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I am passing data from C# to R over a COM interface. When the data arrives in R it is housed in a ‘Matrix’. Some of the functions that I use require that the data be inside a ‘DataFrame’ instead. I convert the data structure using 

newDataFrame <- as.data.frame(oldMatrix)

The table of data reaches R just fine, once I make the conversion to the DataFrame however, it assumes all of my numeric data are factors!

So it turns: {34, 46, 90, 54, 69, 54} into {1, 2, 3, 4, 5, 4}

My data table DOES have factors in it though, so I just can’t force the whole thing to be numeric. Is there any way around this? Note: I can’t export the data as a CSV onto the filesystem and read it into R manually.

On a side note, the function I am using that requires a DataFrame is the ‘Hmisc’ package using 

hist.data.frame(dataFrame)

this produces a frequency histogram for every column of data in the DataFram and arranges them in all in a grid pattern (quite nifty)!

Thanks!
-Dave

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1 Answer

  1. Editorial Team

    I’ve had this problem before. You need to set stringsAsFactors=F when you read the data.

    Now, you can convert individual variables/columns to factors (ie, with as.numeric() and the like), without worrying about how the numbers are treated.

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