r - Change negative values in dataframe column to absolute value -


i have data.frame this:

    col1   col2   col3   col4      col5      col6 1   1982      0      0   -211       107         0 2   4412      0    989      0       296         0 3      0  -5051      0   -267       389       920 4      0  -2983      0   -215         0      1639 5      0  -1326      0   -861         0         0 6   3722      0     89      0       243     13349

how can change negative values absolute values?

abs(dat)

where dat name of data frame.


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