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れ螻 螳 .
(A <- matrix(c(1,6,5,2), nrow=2, byrow=T)) (u <- matrix(c(6,-5), nrow=2, byrow=T)) (v <- matrix(c(3,-1), nrow=2, byrow=T)) 蟆郁骸
> (A <- matrix(c(1,6,5,2), nrow=2, byrow=T)) [,1] [,2] [1,] 1 6 [2,] 5 2 > (u <- matrix(c(6,-5), nrow=2, byrow=T)) [,1] [1,] 6 [2,] -5 > (v <- matrix(c(3,-1), nrow=2, byrow=T)) [,1] [1,] 3 [2,] -1 A 螻螳螻 螻覯″磯 れ螻 螳.
> eigen(A) $values [1] 7 -4 $vectors [,1] [,2] [1,] -0.7071068 -0.7682213 [2,] -0.7071068 0.6401844 u, v螳 A 螻螳 螻覯″一語 覲 覲伎. 襾殊 襯 襷れ. 螻覯″一企 螻螳 覓伎語 print螻, T襯 覦. 螻覯″郁 覃 F襯 覦.
udf_is_eigenvector <- function(A, u){ is_eigenvector <- F for (eval in eigen(A)$values){ if (identical(A%*%u, u*eval) == T){ is_eigenvector <- T print(paste0("eigen value = ", eval)) break } } return(is_eigenvector) } 覲蟆郁骸
> udf_is_eigenvector(A, u) [1] "eigen value = -4" [1] TRUE > udf_is_eigenvector(A, v) [1] FALSE
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