format - using scientific notation in R -


i'm using printcoefmat print matrix out , want apply formatting numbers.

i want force scientific notation when numbers have exponent greater 3. can't quite figure out how scipen works, have idea how can this?

just type in big number r display unscientific notation.

options( scipen = 20 )

if that's not enough, make number bigger...

how scipen penalty work?

it confusing, penalty applied scientific notation version, in r looks @ how many characters takes print particular string. adds value scipen penalty number of characters in scientific notation , if still less number of characters required print actual number print scientific , vice versa. hope example illustrate point:

options( scipen = 0 ) options( digits = 6 ) >1e5 #[1] 1e+05    ----> 5 characters in scientific, vs. 6 '100000' in normal >1e4 #[1] 10000    ----> 5 characters in normal, vs. 5 '1e+04' in scientific options(scipen = 1 ) >1e5 #[1] 100000    ----> 6 characters in normal, vs. 5 + 1 '1e+05' + scipen penalty in scientific

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