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`Ainv.txt`.\n\n\n\n\n \n\n```r\nmakeAinv(ped)\n```\n\n## Arguments\n\n- `ped`: `data.frame` with three columns: id,id parent1,id parent2\n\n## Returns\n\nLogical.\n\n## Examples\n\n```r\nid <- 1:6\ndam <- c(0,0,1,1,4,4)\nsire <- c(0,0,2,2,3,5)\nped <- data.frame(id,dam,sire)\nmakeAinv(ped)\nAi <- read.table('Ainv.txt')\nnInd <- nrow(ped)\nAinv <- matrix(0,nrow = nInd,ncol = nInd)\nAinv[as.matrix(Ai[,1:2])] <- Ai[,3]\ndd <- diag(Ainv)\nAinv <- Ainv + t(Ainv)\ndiag(Ainv) <- dd\n\nif(file.exists(\"Ainv.txt\"))\nfile.remove(\"Ainv.txt\")\n```"}]}]}]}]}]}],["$","div",null,{"className":"lg:w-1/3 lg:border-l px-1 sm:px-8 pt-8 sm:pt-1","children":[["$","div",null,{"className":"mb-8 space-y-8","children":[["$","a",null,{"href":"/packages/pedigree","className":"w-full inline-flex items-center justify-center p-4 text-base font-medium text-gray-600 rounded-lg bg-muted hover:text-gray-900 hover:bg-gray-100 dark:text-gray-400 dark:bg-gray-800 dark:hover:bg-gray-700 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