94 lines
3.3 KiB
Ruby
94 lines
3.3 KiB
Ruby
class Nlopt < Formula
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desc "Free/open-source library for nonlinear optimization"
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homepage "https://nlopt.readthedocs.io/"
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url "https://github.com/stevengj/nlopt/releases/download/nlopt-2.4.2/nlopt-2.4.2.tar.gz"
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sha256 "8099633de9d71cbc06cd435da993eb424bbcdbded8f803cdaa9fb8c6e09c8e89"
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revision 2
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bottle do
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cellar :any
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sha256 "8b24f8a85b1b9e553cfd97a88fb22093926fe787bbeeaa598636baf7adfb1ea3" => :high_sierra
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sha256 "183d661c2b34ff468162b4bcc3bc7c287bcab47ff1bd4b902ea00fe188db1e52" => :sierra
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sha256 "cfb26ea39b36e9a9ad472e2600864d040f02531ba2c922798f82455a25b73a30" => :el_capitan
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sha256 "eed62f227cdfd93ba00d7abe061b4136945a4511d67651d0fa4aa07b196b7b7d" => :yosemite
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end
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head do
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url "https://github.com/stevengj/nlopt.git"
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depends_on "cmake" => :build
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depends_on "swig" => :build
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end
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depends_on "numpy" => :recommended
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def install
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ENV.deparallelize
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if build.head?
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system "cmake", ".", *std_cmake_args,
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"-DBUILD_MATLAB=OFF",
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"-DBUILD_OCTAVE=OFF",
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"-DWITH_CXX=ON"
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else
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system "./configure", "--prefix=#{prefix}",
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"--enable-shared",
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"--with-cxx",
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"--without-octave"
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system "make"
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end
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system "make", "install"
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# Create library links for C programs
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%w[0.dylib dylib a].each do |suffix|
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lib.install_symlink "#{lib}/libnlopt_cxx.#{suffix}" => "#{lib}/libnlopt.#{suffix}"
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end
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end
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test do
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# Based on http://ab-initio.mit.edu/wiki/index.php/NLopt_Tutorial#Example_in_C.2FC.2B.2B
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(testpath/"test.c").write <<~EOS
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#include <math.h>
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#include <nlopt.h>
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#include <stdio.h>
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double myfunc(unsigned n, const double *x, double *grad, void *my_func_data) {
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if (grad) {
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grad[0] = 0.0;
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grad[1] = 0.5 / sqrt(x[1]);
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}
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return sqrt(x[1]);
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}
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typedef struct { double a, b; } my_constraint_data;
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double myconstraint(unsigned n, const double *x, double *grad, void *data) {
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my_constraint_data *d = (my_constraint_data *) data;
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double a = d->a, b = d->b;
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if (grad) {
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grad[0] = 3 * a * (a*x[0] + b) * (a*x[0] + b);
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grad[1] = -1.0;
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}
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return ((a*x[0] + b) * (a*x[0] + b) * (a*x[0] + b) - x[1]);
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}
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int main() {
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double lb[2] = { -HUGE_VAL, 0 }; /* lower bounds */
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nlopt_opt opt;
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opt = nlopt_create(NLOPT_LD_MMA, 2); /* algorithm and dimensionality */
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nlopt_set_lower_bounds(opt, lb);
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nlopt_set_min_objective(opt, myfunc, NULL);
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my_constraint_data data[2] = { {2,0}, {-1,1} };
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nlopt_add_inequality_constraint(opt, myconstraint, &data[0], 1e-8);
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nlopt_add_inequality_constraint(opt, myconstraint, &data[1], 1e-8);
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nlopt_set_xtol_rel(opt, 1e-4);
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double x[2] = { 1.234, 5.678 }; /* some initial guess */
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double minf; /* the minimum objective value, upon return */
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if (nlopt_optimize(opt, x, &minf) < 0)
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return 1;
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else
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printf("found minimum at f(%g,%g) = %0.10g", x[0], x[1], minf);
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nlopt_destroy(opt);
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}
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EOS
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system ENV.cc, "test.c", "-o", "test", "-lnlopt", "-lm"
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assert_match "found minimum", shell_output("./test")
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end
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end
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