A new arithmetic of lower conservatism degree of robust stability for linear interval systems

2008 ◽  
Author(s):  
Lin-kun Zhao ◽  
Shao-sheng Fan
Keyword(s):  
Robust Stability ◽  
Linear Interval ◽  
Linear Interval Systems ◽  
Interval Systems

scholarly journals Two Iterative Methods for Solving Linear Interval Systems

2018 ◽  
Vol 2018 ◽  
pp. 1-13 ◽  
Author(s):  
Esmaeil Siahlooei ◽  
Seyed Abolfazl Shahzadeh Fazeli
Keyword(s):  
Iterative Method ◽  
Conjugate Gradient ◽  
Numerical Experiments ◽  
Gradient Algorithm ◽  
Interval Matrix ◽  
Interval Numbers ◽  
Linear Interval ◽  
Linear Interval Systems ◽  
Diagonally Dominant ◽  
Interval Systems

Conjugate gradient is an iterative method that solves a linear system Ax=b, where A is a positive definite matrix. We present this new iterative method for solving linear interval systems Ãx̃=b̃, where à is a diagonally dominant interval matrix, as defined in this paper. Our method is based on conjugate gradient algorithm in the context view of interval numbers. Numerical experiments show that the new interval modified conjugate gradient method minimizes the norm of the difference of Ãx̃ and b̃ at every step while the norm is sufficiently small. In addition, we present another iterative method that solves Ãx̃=b̃, where à is a diagonally dominant interval matrix. This method, using the idea of steepest descent, finds exact solution x̃ for linear interval systems, where Ãx̃=b̃; we present a proof that indicates that this iterative method is convergent. Also, our numerical experiments illustrate the efficiency of the proposed methods.

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