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# Operacons example trivial barrier supports one use

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Unformatted text preview: tion: abs() and – are scalar operators, automatically promoted to A[LastRow] = operands work with array 1.0; do { [(i,j) in D] Temp[i,j] = (A[i-1,j] + A[i+1,j] + A[i,j-1] + A[i,j+1]) / 4; const delta = max reduce abs(A[D] - Temp[D]); A[D] = Temp[D]; } while (delta > epsilon); writeln(A); Jacobi Iteration in Chapel config const n = 6, epsilon = 1.0e-5; const BigD: domain(2) = {0..n+1, 0..n+1}, D: subdomain(BigD) = {1..n, 1..n}, LastRow: subdomain(BigD) = D.exterior(1,0); C Temp : back ] real; var A,opy data [BigD& Repeat until done uses slicing and A[LastRow] = 1.0;whole array assignment standard do…while loop construct do { [(i,j) in D] Temp[i,j] = (A[i-1,j] + A[i+1,j] + A[i,j-1] + A[i,j+1]) / 4; const delta = max reduce abs(A[D] - Temp[D]); A[D] = Temp[D]; } while (delta > epsilon); writeln(A); Jacobi Iteration in Chapel config const n = 6, epsilon = 1.0e-5; const BigD: domain(2) = {0..n+1, 0..n+1}, D: subdomain(BigD) = {1..n, 1..n}, LastRow: subdomain(BigD) = D.exterior(1,0); var A, Temp : [BigD] real; A[LastRow] = 1.0; Write array to console do { [(i,j) in D] Temp[i,j] = (A[i-1,j] + A[i+1,j] + A[i,j-1] + A[i,j+1]) / 4; const delta = max reduce abs(A[D] - Temp[D]); A[D] = Temp[D]; } while (delta > epsilon); writeln(A); Jacobi Iteration in Chapel config const n = 6, epsilon = 1.0e-5; const BigD: domain(2) = {0..n+1, 0..n+1}, D: subdomain(BigD) = {1..n, 1..n}, LastRow: subdomain(BigD) = D.exterior(1,0); var A, Temp : [BigD] real; A[LastRow] = 1.0; do { [(i,j) in D] Temp[i,j] = (A[i-1,j] + A[i+1,j] + A[i,j-1] + A[i,j+1]) / 4; const delta = max reduce abs(A[D] - Temp[D]); A[D] = Temp[D]; } while (delta > epsilon); writeln(A); forall a in A do writeln(“Here is an element of A: ”, a); •  How many tasks will be used? •  How are iteraCons mapped to the tasks? forall (a, i) in zip(A, 1..n) do a = i / 10.0; Forall- loops may be zippered, like for- loops •  Corresponding iteraCons must match up •  But how does this work? 72 ༉  Arrays can be indexed using variables of their domain’s index type (tuples) or lists of integers var i = 1, j = 2; var ij = (i,j); A[ij] = 1.0; A[i, j] = 2.0; ༉  Array indexing can use either par...
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