| oxide2ppm {GCDkit} | R Documentation | 
Recasts concentrations of an oxide (in wt. %) to that of appropriate cation (in ppm).
oxide2ppm(formula,where="WR")
| formula | character: the oxide which is to be recalculated | 
| where | character: a name of matrix or dataframe with the data to be recalculated | 
A numeric matrix with one column containing the recalculated concentrations of the given cation (ppm) for individual samples.
Vojtěch Janoušek, vojtech.janousek@geology.cz
ppm2oxide, oxide2oxide, molecularWeight 
    sampleDataset("sazava")
    
    oxide2ppm("K2O")
    
    oxide2ppm("FeOt")
    oxide2ppm("FeO")+oxide2ppm("Fe2O3")