** Rational approximation. **

** [N,D] = RAT(X,tol) returns two integer matrices so that N./D **

** is close to X in the sense that abs(N./D - X) <= tol*abs(X). **

** The rational approximations are generated by truncating continued **

** fraction expansions. tol = 1.e-6*norm(X(:),1) is the default. **

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** RAT(X) or RAT(X,tol) displays the continued fraction representation. **

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** The same algorithm, with the default tol, is used internally **

** by MATLAB for FORMAT RAT. **

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** See also FORMAT , RATS . **

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