CODEWITHSUNDEEP
r
Rann
Rann

Reputation: 315

R vector subtraction

I'm in R and want to subtract two vectors term by term.

Here are my code

y <- faithful
u_old1 <- c(3.5,80)

#  eruptions waiting
#1     3.600      79
#2     1.800      54
#3     3.333      74
# ...

y - u_old1

#    eruptions waiting
#1       0.100    75.5
#2     -78.200   -26.0
#3      -0.167    70.5
# ...

I think it's the recycling in R that does is. I want each row of y minus u_old1. So I should get the first row as:

#    eruptions waiting
#1       0.100      -1

Upvotes: 2

Views: 120

Answers (2)

thelatemail
thelatemail

Reputation: 93813

This is what sweep was made for:

sweep(y, 2, u_old1)

#    eruptions waiting
#1       0.100      -1
#2      -1.700     -26
#3      -0.167      -6
# ...

Upvotes: 2

A5C1D2H2I1M1N2O1R2T1
A5C1D2H2I1M1N2O1R2T1

Reputation: 193527

If I understand your question correctly, you should use as.list(u_old1) instead:

Example:

head(y) - as.list(u_old1)
#   eruptions waiting
# 1     0.100      -1
# 2    -1.700     -26
# 3    -0.167      -6
# 4    -1.217     -18
# 5     1.033       5
# 6    -0.617     -25

Upvotes: 1

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