By Carl De Boor

ISBN-10: 0387953663

ISBN-13: 9780387953663

This booklet is predicated at the author’s adventure with calculations regarding polynomial splines, featuring these components of the speculation in particular precious in calculations and stressing the illustration of splines as weighted sums of B-splines. The B-spline thought is constructed at once from the recurrence kin with out recourse to divided modifications. This reprint comprises redrawn figures, and such a lot formal statements are observed via proofs.

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Extra info for A Practical Guide to Splines (Revised Edition)

Example text

The second of these relations shows that an envelope is formed in t > 0 by those characteristics for which f"(£) < 0- The minimum value of t on the envelope occurs for the value of £ for which — F'(£) is maximum. 8). If F"(|) is continuous, the envelope has a cusp at t=tB, as shown in Fig. 1. An extreme case of breaking arises when the initial distribution has a discontinuous step with the value of c(p) behind the discontinuity greater than that ahead. If we have the initial functions 24 WAVES AND FIRST ORDER EQUATIONS Chap.

2); it is not the defining property of characteristics. 3) as characteristics. The basic idea of wave propagation is that some recognizable feature of the disturbance moves with a finite velocity. For hyperbolic equations, the characteristics correspond to this idea. Each characteristic curve in (x, t) space represents a moving wavelet in x space, and the behavior of the solution on a characteristic curve corresponds to the idea that information is carried by that wavelet. The. 4) may be given this type of emphasis by saying that different values of p "propagate" with velocity c(p).

The shock determination can then be described entirely on the fixed F(£) curve by drawing all the chords with the equal area property. The pairs £ = £= |2 at the ends of each chord relate characteristics which meet on the shock. The (x,t) plane is shown in Fig. 10. 45) since the left hand side is the area under the chord and the right hand side is the area under the F curve. 40). 47) determine the three functions s(t), £,(/)> and £2(f). The determination of s(t) is implicit involving the two additional functions | , ( 0 and £2(t) which determine the characteristics meeting the shock at time t.