Created
April 2, 2019 15:53
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#'@author Felipe Carvalho and Willian Vieira | |
#' | |
#'@see https://www.geeksforgeeks.org/determinant-of-a-matrix/ | |
matriz_exercicio <- matrix(c(-1, 2, 3,-4, | |
4, 2, 0, 0,-1, 2,-3, 0, | |
2, 5, 3, 1), | |
nrow = 4, | |
ncol = 4) %>% t() | |
#' @method menor_completar | |
#' | |
#' @description Obter o menor complementar | |
#' | |
#' @param matriz | |
#' | |
#' @param linha_fixa | |
#' | |
#' @param coluna_var | |
#' | |
#' @param ordem | |
#' | |
#' @return submatriz | |
menor_complementar <- function(matriz, | |
linha_fixa, | |
coluna_var, | |
ordem) { | |
if (coluna_var == 1) { | |
return(matriz[(linha_fixa + 1):ordem, | |
(coluna_var + 1):ordem]) | |
} else if (coluna_var > 1 & coluna_var < ordem) { | |
return(matriz[(linha_fixa + 1):ordem, | |
1:ordem != coluna_var]) | |
} else{ | |
return(matriz[(linha_fixa + 1):ordem, | |
1:(coluna_var - 1)]) | |
} | |
} | |
#' @method calc_laplace | |
#' | |
#' @description Obter o determinante | |
#' | |
#' @param matriz | |
#' | |
#' @param ordem | |
#' | |
#' @return Determinante | |
calc_laplace <- function(matriz, ordem) { | |
cofator <- 0 | |
if (ordem == 1 || is.null(ordem)) { | |
return(matriz) | |
} | |
for (j in 1:ordem) { | |
submatriz <- | |
menor_complementar(matriz, 1, j, ordem) | |
sinal <- (-1) ^ (1 + j) | |
cofator <- cofator + | |
sinal * matriz[1, j] * calc_laplace(submatriz, ordem - 1) | |
} | |
return(cofator) | |
} |
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