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 P: n/a I have a vector class and a matrix class. The matrix class uses the vector class to implement a matrix. Within the vector class there is a polynomial curve fit method. The curve fit method uses matrices to implement perform the curve fit. Does the fact that the vector class uses the matrix class violate a design rule? Jul 19 '05 #1
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 P: n/a not telling wrote: I have a vector class and a matrix class. The matrix class uses the vector class to implement a matrix. Within the vector class there is a polynomial curve fit method. The curve fit method uses matrices to implement perform the curve fit. Does the fact that the vector class uses the matrix class violate a design rule? No. Jul 19 '05 #2

 P: n/a not telling wrote: I have a vector class and a matrix class. The matrix class uses the vector class to implement a matrix. Within the vector class there is a polynomial curve fit method. The curve fit method uses matrices to implement perform the curve fit. Does the fact that the vector class uses the matrix class violate a design rule? Take a look at The C++ Scalar, Vector, Matrix and Tensor class Library (SVMTL) http://www.netwood.net/~edwin/svmtl/ High Performance Embedded Computing Software Initiative (HPEC-SI) http://www.hpec-si.org/ Object Oriented Numerics Web Page http://www.oonumerics.org/ Jul 19 '05 #3

 P: n/a not telling might (or might not) have written this on (or about) Wed, 13 Aug 2003 14:56:22 -0600, : I have a vector class and a matrix class.The matrix class uses the vector class to implement a matrix.Within the vector class there is a polynomial curve fit method.The curve fit method uses matrices to implement perform the curve fit.Does the fact that the vector class uses the matrix class violate a designrule? Why does vector need a curve fit method? Do you really want everyone who uses vector to have to import the curve-fitting code? This is a violation of the Single Responsibility Principle (SRP) which states that a class should have one, and only one, reason to change. By associating curve fitting with vector, you force vector to change when new curve fitting algorithms are needed. All users of vector, whether they use the curve fitting or not, must then update their builds. Robert C. Martin | "Uncle Bob" Object Mentor Inc.| unclebob @ objectmentor . com PO Box 5757 | Tel: (800) 338-6716 565 Lakeview Pkwy | Fax: (847) 573-1658 | www.objectmentor.com Suite 135 | | www.XProgramming.com Vernon Hills, IL, | Training and Mentoring | www.junit.org 60061 | OO, XP, Java, C++, Python | Jul 19 '05 #4

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