loop over variables in dataframe R

Question

Not completelty sure if my question is a duplicate...

Suppose I have a dataframe (X), containing 3 columns (A,B and C) with > 100 rows:

X:

A B C
5 10 20
10 8 100
...

Next, I want to use the values of each row (loop) in this dataframe in a script:

For example, in the first "loop"

A<-5
B<-10
C<-20
D<-A*B*C

The second loop

A<-10
B<-8
C<-100
D<-A*B*C

So in the end the ouput of my script contains two values

1000
8000

Anyone could help me with that?

Thank you in advance.

WD

Try X$D <- apply(X, 1, prod).

Rui Barradas
– Rui Barradas

2017-10-11 22:19:15 +00:00
Commented Oct 11, 2017 at 22:19 — Rui Barradas
– Rui Barradas, Commented Oct 11, 2017 at 22:19

akrun · Accepted Answer · 2017-10-12 02:44:41Z

1

Here is an option using Reduce

df$D <- Reduce(`*`, df)

answered Oct 12, 2017 at 2:44

akrun

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2 Comments

Wannes Dermauw Over a year ago

THanks for the proposed solution. But I think I simplified my example too much. I would like to use the variables in each row to make a plot. So for n rows, I would like to make N plots (using the 3 variables).

akrun Over a year ago

@WannesDermauw It is better to show something that related to what u r doing

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