arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1201.5975math.NAcs.NA
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带误差估计的浮点数(修订版)

Floating-Point Numbers with Error Estimates (revised)

Glauco Masotti

AI总结:

提出一种通过数据结构收集值和估计误差信息来估计浮点计算中误差的方法,并讨论其软件模拟结果,确保结果有效性并支持动态精度扩展。

摘要:

本研究解决了浮点(FP)计算中的精度问题。提出了一种估计影响中间和最终结果的误差的方法,并讨论了许多软件模拟的总结。基本思想是通过一种数据结构来表示浮点数,该结构收集值和估计误差信息。在某些约束下,绝对误差的估计是准确的,并且具有紧凑的统计分布。通过在计算过程中监测估计的相对误差(使用了相对误差的特定定义),可以确保结果的有效性。误差估计使得鲁棒算法的实现以及病态问题的检测成为可能。为了在给定的误差界限内计算结果,提倡在误差估计的控制下动态扩展数字精度。通过专门的浮点处理器可以实现减少的时间开销。利用当前技术,实现一个包含该方法的硬连线处理器应该不再是问题,并且将使该方法在实际应用中的采用变得可行。

英文摘要:

The study addresses the problem of precision in floating-point (FP) computations. A method for estimating the errors which affect intermediate and final results is proposed and a summary of many software simulations is discussed. The basic idea consists of representing FP numbers by means of a data structure collecting value and estimated error information. Under certain constraints, the estimate of the absolute error is accurate and has a compact statistical distribution. By monitoring the estimated relative error during a computation (an ad-hoc definition of relative error has been used), the validity of results can be ensured. The error estimate enables the implementation of robust algorithms, and the detection of ill-conditioned problems. A dynamic extension of number precision, under the control of error estimates, is advocated, in order to compute results within given error bounds. A reduced time penalty could be achieved by a specialized FP processor. The realization of a hardwired processor incorporating the method, with current technology, should not be anymore a problem and would make the practical adoption of the method feasible for most applications.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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