> mean(c("-1","0", "1"))
[1] NA
Warning message:
argument is not numeric or logical: returning NA in: mean.default(c("-1", "0",
"1"))
> median(c("-1","0", "1"))
Error in median.default(c("-1", "0", "1")) :
need numeric data
> var(c("-1","0", "1"))
[1] 1
>
Is the above intentional behavior? mean and median of character data
give a warning and error. var gives the result of coercing the argument
to numeric.
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