OptionalnormThe norm: "O" or "1" (one norm) or "I" (infinity norm). Default: "O".
OptionaltriangularTreat x as triangular and use only its triangle given by uplo. Default: false.
OptionaluploWith triangular: true, use the upper ("U") or lower ("L") triangle; any other value is an error for a
square matrix (a non-square matrix uses R of its QR decomposition, as in R). Default: "U".
Options for rcond.