CODEWITHSUNDEEP
r
Muhammad Faheem Sajjad
Muhammad Faheem Sajjad

Reputation: 35

Error in inv(A) : could not find function "inv"

*** It's related to R I want to take inverse of A (matrix) by inv(). Which package from what library should i install ?

Little code is as follows,

A <- matrix( c(5, 1, 0,
               3,-1, 2,
               4, 0,-1), nrow=3, byrow=TRUE)
det(A)

(AI  <- inv(A))

Upvotes: 1

Views: 4830

Answers (2)

Daniel R
Daniel R

Reputation: 2042

To get the inverse of a matrix in R, use the solve function.

See https://www.rdocumentation.org/packages/base/versions/3.6.2/topics/solve

A <- matrix( c(5, 1, 0,
               3,-1, 2,
               4, 0,-1), nrow=3, byrow=TRUE)
solve(A)

gives the output

       [,1]    [,2]   [,3]
[1,] 0.0625  0.0625  0.125
[2,] 0.6875 -0.3125 -0.625
[3,] 0.2500  0.2500 -0.500

Upvotes: 4

Łukasz Deryło
Łukasz Deryło

Reputation: 1860

I typed "inv function r" into Google. First result was pracma package:

library('pracma')
A <- matrix( c(5, 1, 0,
                3,-1, 2,
                4, 0,-1), nrow=3, byrow=TRUE)
det(A)
[1] 16
(AI  <- inv(A))
       [,1]    [,2]   [,3]
[1,] 0.0625  0.0625  0.125
[2,] 0.6875 -0.3125 -0.625
[3,] 0.2500  0.2500 -0.500

Upvotes: 1

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