add eigen3

eigen3/build.sh

@@ -0,0 +1,4 @@
+#!/bin/sh
+mkdir build && cd build
+cmake -DCMAKE_INSTALL_PREFIX=${PREFIX} -DCMAKE_BUILD_TYPE=Release ..
+make install

eigen3/meta.yaml

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+package:
+  name: eigen3
+  version: "3.2.1"
+
+source:
+  fn: eigen3-3.2.1.tar.gz
+  url: http://bitbucket.org/eigen/eigen/get/3.2.1.tar.gz
+  sha1: 96709ff139c80861e7b2cf65a9dfca8a8cc46eeb
+
+requirements:
+  build:
+    - cmake
+
+test:
+  files:
+    - test.cc
+
+about:
+  home: http://eigen.tuxfamily.org/
+  license: MPL2
+  summary: 'C++ template library for linear algebra'

eigen3/run_test.sh

@@ -0,0 +1,3 @@
+#!/bin/sh
+g++ -I${PREFIX}/include -o test test.cc
+./test

eigen3/test.cc

@@ -0,0 +1,13 @@
+#include <eigen3/Eigen/Dense>
+#include <cassert>
+
+using Eigen::MatrixXf;
+
+int
+main(void)
+{
+  MatrixXf m(1, 1);
+  m(0, 0) = 1.0;
+  assert(m(0, 0) == 1.0);
+  return 0;
+}