Download A Numerical Library in Java for Scientists and Engineers by Hang T. Lau PDF

By Hang T. Lau

ISBN-10: 1584884304

ISBN-13: 9781584884309

Finally researchers have a cheap library of Java-based numeric methods to be used in clinical computation. the 1st and basically publication of its sort, A Numeric Library in Java for Scientists and Engineers is a translation into Java of the library NUMAL (NUMerical tactics in ALgol 60).

This groundbreaking textual content offers procedural descriptions for linear algebra, traditional and partial differential equations, optimization, parameter estimation, mathematical physics, and different instruments which are integral to any dynamic study group.

The ebook bargains attempt courses that permit researchers to execute the examples supplied; clients are loose to build their very own assessments and follow the numeric approaches to them to be able to notice a profitable computation or simulate failure. The access for every process is logically provided, with identify, utilization parameters, and Java code included.

This guide serves as a robust learn instrument, permitting the functionality of serious computations in Java. It stands as a budget friendly replacement to dear advertisement software program package deal of procedural elements.

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Additional info for A Numerical Library in Java for Scientists and Engineers

Example text

If timser is called with an even value of mode, it is assumed that the values of µ and ν have been allocated to mean and var before call. Procedure parameters: void timser (w,n,k,l,mode,mean,var,alpha,beta, gamma) w: double w[1:n]; the value of wi in location (i) (i=1,…,n); n: int; the value of n above; k: int; (required if mode > 1) the value of k; l: int; (required if mode > 5) the value of l; mode: int; the value of mode above; mean, var: double mean[0:0], var[0:0]; entry: (required if mode is even) the values of µ and ν, respectively; exit: the value of µ and ν; Addenda 787 alpha: double alpha[1:k]; exit (if mode > 1): the value of αj in location j (j=1,…,k); double beta[1:k]; exit (if mode > 3): the value of βj in location j (j=1,…,k); double gamma[1:l]; exit (if mode > 5): the value of γj in location j (j=1,…,l).

8558704E-17 II. Time series analysis A. powsp Computes a) the Fourier transform of the power-spectrum of a time series and, if so requested, b) that of a second time series together with the Fourier transform of the cross-spectrum of the two time series. The values of two positive integers n and l must be supplied at call and it is assumed that n is divisible by l and that l is a power of 2; if n is not divisible by l, powsp is given that value false and no computations are performed. With the real numbers xi, (i=0,…,n-1) provided, and with the value allocated to crossp false upon call, the numbers xˆ (jh ) = w j x hl + j where n=ml and wj = 1− and (h = 0, K , m − 1; j = 0, K , l − 1) j − 12 (l − 1) ) 1 2 (l + 1) ( j = 0,K, l − 1) Addenda 781 l −1 f k( h ) = ∑ xˆ (jh ) e 2πijk / n j =0 ψ x (k ) = 3 m −1 ( h ) ∑ fk n h =0 2 (k = 0,K, l − 1) (k = 0, K, 12 l ) are computed.

Rfftr Computes the values of n −1 a k +1 = ∑ a ′j +1e 2πijk / n j =0 (k = 0, K , n − 1) using a fast Fourier transform, where the {a’j+1} are real numbers, and n is assumed to be an even positive integer. ,½n); gamn: double gamn[1:2]; Re(ak+1) and Im(ak+1) in locations (1) and (2) respectively when k=½n+1 (for the remaining {ak+1}, an+2-j=āj (j=2,3,…, ½n)); n: integer; the value of n above. sin(theta); a1[1][k] = (alph[1] + (beta[1]*s1[1] - beta[2]*s1[2])) * half; a1[2][k] = (alph[2] + (beta[1]*s1[2] + beta[2]*s1[1])) * half; a1[1][nmk] = (alph[1] - (beta[1]*s1[1] - beta[2]*s1[2])) * half; a1[2][nmk] = -(alph[2] - (beta[1]*s1[2] + beta[2]*s1[1])) * half; theta += tp; 777 A Numerical Library in Java for Scientists and Engineers 778 } } gamn[1] = gam[1]; gamn[2] = gam[2]; for (i=1; i<=n; i+=2) { k = i/2 + 1; a[i] = a1[1][k]; a[i+1] = a1[2][k]; } } G.

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