# MATLAB 中的定点矩阵运算

## 函数

 `ceilDiv` Round the result of division toward positive infinity `fixed.cordicDivide` Fixed-point divide using CORDIC `fixed.cordicReciprocal` Fixed-point reciprocal using CORDIC `fixDiv` Round the result of division toward zero `floorDiv` Round the result of division toward negative infinity `nearestDiv` Round the result of division toward the nearest integer `modByConstant` Modulus after division by a constant denominator
 `fixed.backwardSubstitute` Solve upper-triangular system of equations through backward substitution `fixed.forwardSubstitute` 通过前代求解下三角方程组 `fixed.qlessQR` Q-less QR decomposition `fixed.qlessQRUpdate` Update QR factorization `fixed.qrAB` Compute C = Q'B and upper-triangular factor R `fixed.qrMatrixSolve` Solve system of linear equations Ax = B for x using QR decomposition `fixed.qlessQRMatrixSolve` Solve system of linear equations (A'A)X = B for X using Q-less QR decomposition `fixed.svd` Fixed-point singular value decomposition `svd` Fixed-point singular value decomposition
 `fixed.qrFixedpointTypes` Determine fixed-point types for transforming A and R and B to C=Q'B in-place, where QR=A is QR decomposition of A `fixed.qlessqrFixedpointTypes` Determine fixed-point types for transforming A to R in-place, where R is upper-triangular factor of QR decomposition of A, without computing Q `fixed.realQRMatrixSolveFixedpointTypes` Determine fixed-point types for matrix solution of real-valued AX=B using QR decomposition `fixed.complexQRMatrixSolveFixedpointTypes` Determine fixed-point types for matrix solution of complex-valued AX=B using QR decomposition `fixed.realQlessQRMatrixSolveFixedpointTypes` Determine fixed-point types for matrix solution of real-valued A'AX=B using QR decomposition `fixed.complexQlessQRMatrixSolveFixedpointTypes` Determine fixed-point types for matrix solution of complex-valued A'AX=B using QR decomposition `fixed.realSingularValueLowerBound` Estimate lower bound for smallest singular value of real-valued matrix `fixed.complexSingularValueLowerBound` Estimate lower bound for smallest singular value of complex-valued matrix `fixed.singularValueUpperBound` Upper bound of largest singular value of matrix `fixed.realConditionNumberUpperBound` Estimate of upper bound for 2-norm condition number of real-valued matrix `fixed.complexConditionNumberUpperBound` Estimate of upper bound for 2-norm condition number of complex-valued matrix `fixed.forgettingFactor` Compute forgetting factor required for streaming input data `fixed.forgettingFactorInverse` Compute the inverse of the forgetting factor required for streaming input data `fixed.realQuantizationNoiseStandardDeviation` Estimate standard deviation of quantization noise of real-valued signal `fixed.complexQuantizationNoiseStandardDeviation` Estimate standard deviation of quantization noise of complex-valued signal