Hi R users,
I have a question about manipulating the dataframe. I want to create a new
dataframe, and to multiply rows with different seasons for different
constants.
DF
year month day product1 product2 product3
1981 1 1 18 56 20
1981 1 2 19 45 22
1981 1 3 16 48 28
1981 1 4 19 50 21
1981 2 1 17 49 25
1981 2 2 20 47 23
1981 2 3 21 52 27
For example, how to multiply product1 in month1 by 3.1, and to multiply
product3 in month2 by 2.0? I wrote the code like this but does not work.
Thanks for your help.
DF['month'==1, ]$product1_1 = DF['month'==1, ]$product1 * 3.1;
DF['month'==2, ]$product3_1 = DF['month'==1, ]$product3 * 2.0;
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