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Plotting histograms for a data.frame. Also the function will name the graphs and number the graphs.
ploth(x,c)
:a dataframe
:is there dummy variable in the data.frame; c = 0 when there is none; c = 1 when there is
# NOT RUN { #ploth(sp500,0) for histograms of sp500 which does not has dummy variables # }
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