'sodexquan' is an data frame of numeric variables with some missing values.
I would like to approximate these missing values using some algorithm.
I thereby chose the mix package.
But when trying to run the 'prelim.mix' function (aka the function that will 
prepare the data for further calculations), R says:

prelim.mix(truc,0)
Error in as.integer.default(list(c(32, 52, 32, 27, 34, 35, 35, 28, 42, : 
the object (list) can't be converted in 'integer'

I roughly translated the word in english, because it was localized in 
french.

I would like to correct this.

Laurent

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