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http://issues.apache.org/bugzilla/show_bug.cgi?id=28019 SplineInterpolator gives bad interpolation Summary: SplineInterpolator gives bad interpolation Product: Commons Version: Nightly Builds Platform: PC OS/Version: Other Status: NEW Severity: Major Priority: Other Component: Math AssignedTo: [EMAIL PROTECTED] ReportedBy: [EMAIL PROTECTED] The CubicSplineFunction does not fit on each interval: > Replace > double dquot = (yval[1] - yval[0]) / (xval[1] - xval[0]); > for (int i = 0; i < n - 1; i++) { > double dquotNext = > (yval[i + 2] - yval[i + 1]) / (xval[i > + 2] - xval[i + 1]); > b[i] = 6.0 * (dquotNext - dquot); > d[i] = 2.0 * (xval[i + 2] - xval[i]); > dquot = dquotNext; > } > > > With > > //Source: http://mathworld.wolfram.com/CubicSpline.html > for (int i = 0; i < n - 1; i++) { > b[i] = 3.0 * (yval[i+1] - yval[i]); > d[i] = (i>0 && i<n-2)? 4.0: 2.0 ; > } > --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
