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One of the most novel aspects of ZPL is its facility for defining regions of arrays for parallel operations, and directions of array offsets. Associated with this facility are some array structuring features including wrapping, reflecting, and flooding of array dimensions.
program jacobi; config var n : integer = 5; -- Declarations delta : float = 0.0001; region R = [1..n, 1..n]; direction north = [-1, 0]; south = [ 1, 0]; east = [ 0, 1]; west = [ 0,-1]; procedure jacobi(); -- Entry point var A, Temp : [R] float; err : float; begin [R] A := 0.0; -- Initialization [north of R] A := 0.0; [east of R] A := 0.0; [west of R] A := 0.0; [south of R] A := 1.0; [R] repeat -- Main body Temp := (A@north+A@east+A@west+A@south) / 4.0; err := max<< abs(A-Temp); A := Temp; until err < delta; [R] writeln(A); -- Output result end;
Descriptions in this dictionary are ©1997-99 Neal Ziring. Some examples copyright of their respective authors. Some technologies and languages are trademarked. Permission to copy descriptions is granted as long as authorship credit is preserved.
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Dictionary and script maintained by Neal Ziring, last major modifications 3/18/98. Most recent additions to dictionary and master list, 1/00.