CODEWITHSUNDEEP
r
user8424474
user8424474

Reputation:

Comparing two rows of numbers

I'm interested in writing a code that enables me to compare two rows of numbers that can also tell me if any numbers are missing from the second row.

Would anybody be able to help me get started or does anybody already have that kind of code?

Any help would be greatly appreciated.

Upvotes: 0

Views: 223

Answers (1)

Oriol Mirosa
Oriol Mirosa

Reputation: 2826

Given the data example that you provided in the comments, in which you have two matrices of equal dimensions:

A <- matrix(c(210, 211, 212, 213), 2)
B <- matrix(c(210, 211, 212, 214), 2)

You can check the differences merely doing this (with the FALSE being the values that are not equal:

A == B

##      [,1]  [,2]
## [1,] TRUE  TRUE
## [2,] TRUE FALSE

If you want to know where the difference is, you can do this (notice that a matrix is a special kind of vector, so you get just one index):

which(A != B)

## 4

Then, if you want to know what are the values in A and B that differ, you can do:

A[which(A != B)]

## 213

B[which(A != B)]

## 214

And you could subtract both lines if you want the actual difference in value:

A[which(A != B)] - B[which(A != B)]

## -1

Upvotes: 1

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