str(proteins.training)
Classes ‘data.table’ and 'data.frame':  13890 obs. of  37 variables:
 $ protein_id          : int  19 19 19 19 19 19 19 19 19 19 ...
 $ hydrophobic         : num  1.111 1.631 1.39 0.986 2.077 ...
 $ hydrophilic         : num  0.0734 0.0082 0.5988 0.7539 1.0016 ...
 $ hydrophatyIndex     : num  4.38 6.25 3.29 1.5 3.27 ...
 $ aliphatic           : num  1.111 1.631 1.39 0.986 2.077 ...
 $ aromatic            : num  0 0 0 0 0 0 0 0 0 0 ...
 $ sulfur              : num  0 0 0 0 0 ...
 $ hydroxyl            : num  0.0489 0.8104 0.609 0 2.7633 ...
 $ basic               : num  0 0 0.148 0 0 ...
 $ acidic              : num  0.0734 0.0082 0.5246 0.7539 0.8588 ...
 $ amide               : num  0 0 0 0 0.143 ...
 $ posCharge           : num  0 0 0.0742 0 0 ...
 $ negCharge           : num  0.0734 0.0082 0.5246 0.7539 0.8588 ...
 $ hBondDonor          : num  0 0 0.0742 0 0 ...
 $ hBondAcceptor       : num  0.0734 0.0082 0.5246 0.7539 0.8588 ...
 $ hBondDonorAcceptor  : num  0.0489 0.8104 0.609 0 2.9062 ...
 $ polar               : num  0.122 0.819 1.208 0.754 3.765 ...
 $ ionizable           : num  0.0734 0.0082 0.5988 0.7539 0.8588 ...
 $ atoms               : int  9 12 15 11 21 31 41 7 17 12 ...
 $ atomDensity         : num  1.23 2.45 2.6 1.74 5.84 ...
 $ atomC               : num  1.12 1.73 1.99 1.43 3.83 ...
 $ atomO               : num  0.061 0.422 0.401 0.311 1.317 ...
 $ atomN               : num  0.048 0.293 0.202 0 0.692 ...
 $ hDonorAtoms         : num  0.000918 0.276162 0.163301 0 0.41449 ...
 $ hAcceptorAtoms      : num  0.000918 0.276162 0.165087 0.199366 0.41449 ...
 $ vsAromatic          : num  0 0 0 0 0 0 0 0 0 0 ...
 $ vsCation            : num  0 0 0 0 0 0 0 0 0 0 ...
 $ vsAnion             : num  0 0 0.00179 0.19937 0 ...
 $ vsHydrophobic       : num  1.12 1.73 1.99 1.43 3.83 ...
 $ vsAcceptor          : num  0.061 0.422 0.399 0.112 1.317 ...
 $ vsDonor             : num  0.0489 0.5688 0.365 0 1.107 ...
 $ protrusion          : int  56 71 76 59 89 104 143 67 80 78 ...
 $ bfactor             : num  27 50.1 54.6 40.5 115.7 ...
 $ apRawValids         : num  0.707 1.97 1.685 1.488 3.494 ...
 $ apRawInvalids       : num  0.31 1.109 0.922 0.596 2.083 ...
 $ atomicHydrophobicity: num  -0.8405 -0.5753 -0.7717 -0.6123 -0.0867 ...
 $ class               : chr  "0" "0" "0" "0" ...
 - attr(*, ".internal.selfref")=<externalptr>