... underdeterminant 子行列式 underdetermined equation 欠定方程 underdeveloped countries 不发达国家 ...
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分别采用 LSQR 和 ART 算法对欠定方程组进行了层析成像计算。
LSQR and ART algorithms are applied separately to calculate tomography for the underdetermined system of equation.
采用弯曲射线追踪算法计算走时，分别用最小二乘QR分解算法与代数重建技术就恰定方程组、超定方程组与欠定方程组进行了成像计算。
LSQR and ART algorithms are applied separately to calculate tomography for the determined system of equation, overdetermined system of equation and underdetermined system of equation.
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