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View of /branches/vis15/src/tests/rtest/tests/heron/heron.diderot

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Revision 4102 - (download) (annotate)
Wed Jun 29 22:03:51 2016 UTC (3 years ago) by jhr
File size: 794 byte(s)
adding regression tests
/*! \file heron.diderot
 *
 * \author John Reppy
 * \author Gordon Kindlmann
 *
 * This example illustrates using Heron's method for computing square roots, originally
 * created by Gordon Kindlmann for the VIS'12 submission.  It serves as a test for
 * loading dynamic data sequences.
 */

/*
 * This code is part of the Diderot Project (http://diderot-language.cs.uchicago.edu)
 *
 * COPYRIGHT (c) 2015 The University of Chicago
 * All rights reserved.
 */

input int{} args = load("../../data/numbers.nrrd");
int nArgs = length(args);
real eps = 0.00001;

strand SqRoot (real arg)
{
    output real out = arg;  // holds root approximation

    update {
	out = (out + arg/out) / 2.0;
	if (|out^2 - arg| / arg < eps)
	    stabilize;
    }
}

collection { SqRoot(args{i}) | i in 0 .. nArgs-1 }

root@smlnj-gforge.cs.uchicago.edu
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