I want to qqnorm every column in a table.  When I try the first column
using

qqnorm(table$column1), it worked.

But when I use

qqnorm(table[1]), it tells me "Error in stripchart(x1, ...) : invalid
plotting method".

What happen?  How can I make a function that qqnorms every column?

thanks a lot.

-jiong
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