Using Excel, Visual Basic and NAG's Numerical Libraries â getting ...

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Debugging • When writing your own code consider: How the variables are declared NAG doesn’t accept Variants Integers are declared as Long How arguments are passed (ByRef/ ByVal) What the sizes <strong>and</strong> dimensions of arrays are If the arrays are numbered from 0 or 1 If arrays need to be transposed If IFAIL is set properly 10
How to pass arrays as arguments • F03AFF (f03aff) – calculates the determinant of a real matrix <strong>and</strong> performs LU factorization. • Note: Reading the array from the worksheet (Range->Double) Checking if the matrix is a square matrix The result of the factorization is not shown. How can it be shown 11
Page 1 and 2: Using Excel, Visual Basic and NAG
Page 3 and 4: Why NAG & Excel • Microsoft Offic
Page 5 and 6: Why you don’t need to be a C/Fort
Page 7 and 8: The IFAIL parameter IFAIL in NAG Fo
Page 9: How to handle callbacks • A callb
Page 13 and 14: Conclusions • Calling NAG routine
Page 15: Questions • www.nag.co.uk • sup

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Using Excel, Visual Basic and NAG's Numerical Libraries â getting ...