Therefore, if CADNA_C is used on a 64-bit processor with the GNU C++ compiler, mathematical functions are computed with rounding to the nearest, otherwise they are computed with the random rounding mode. As a remark, on 64-bit processors, the mathematical library associated with the GNU C++ compiler may provide incorrect results or generate severe bugs with rounding towards −∞ and +∞, which the random rounding mode is based on. The C++ language files contain the definition of the stochastic types on which the control of accuracy can be performed, CADNA_C specific functions (for instance to enable or disable the detection of numerical instabilities), the definition of arithmetic and relational operators which are overloaded for stochastic variables and the definition of mathematical functions which can be used with stochastic arguments. This assembly file contains routines which are frequently called in the CADNA_C C++ files to change the rounding mode. cadna_rounding.s is a symbolic link to the assembly file corresponding to the processor and the C++ compiler used.
CADNAA CODE
Summary of revisions: The CADNA_C source code consists of one assembly language file (cadna_rounding.s) and twenty-three C++ language files (including three header files). The new version has been developed to enable this estimation in C or C++ programs. Reasons for new version: The previous version (AEAT_v1_0) enables the estimation of round-off error propagation in Fortran programs. From this set of results, CADNA estimates the number of exact significant digits in the result that would have been computed with standard floating-point arithmetic. The program is run several times with a random rounding mode generating different results each time. Solution method: The CADNA library implements Discrete Stochastic Arithmetic which is based on a probabilistic model of round-off errors. The CADNA library enables one to estimate round-off error propagation in any simulation program and to detect all numerical instabilities that may occur at run time. Round-off error propagation may invalidate the result of a program. Nature of problem: A simulation program which uses floating-point arithmetic generates round-off errors, due to the rounding performed at each assignment and at each arithmetic operation. 178 (2008) 933ĭoes the new version supersede the previous version?: No Journal reference of previous version: Comput.
CADNAA PC
of bytes in distributed program, including test data, etc.: 710 781Ĭomputer: PC running LINUX with an i686 or an ia64 processor, UNIX workstations including SUN, IBMĬatalogue identifier of previous version: AEAT_v1_0 of lines in distributed program, including test data, etc.: 60 075 Licensing provisions: Standard CPC licence,
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CADNAA SOFTWARE
CadnaA is developed in C/C++ and communicates perfectly with other Windows applications like word processors, spreadsheet calculators, CAD software and GIS-databases.Program obtainable from: CPC Program Library, Queen's University, Belfast, N.
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With its technical capabilities and its ease of use CadnaA represents state-of-the-art technology. With more than 30 implemented standards and guidelines, powerful calculation algorithms, extensive tools for object handling, outstanding 3D visualization and the very user-friendly interface CadnaA is the perfect software to handle national and international noise calculation and noise mapping projects of any size.ĬadnaA with extension Option APL also allows calculation, assessment and presentation of air pollutant distribution. Whether your objective is to study the noise immission of an industrial plant, of a mart including a parking lot, of a new road or railway scheme or even of entire towns and urbanized areas: CadnaA is designed to handle all these tasks. ISTIQ has using CadnaA: State-of-the-art Noise Prediction Software for noise simulation.ĬadnaA (Computer Aided Noise Abatement) is the leading software for calculation, presentation, assessment and prediction of environmental noise. Noise Prediction Simulation using Software CadnaA