Fix some formatting in quick ref. Add references to headers.

doc/AsciiQuickReference.txt

@@ -1,3 +1,9 @@
+// A simple quickref for Eigen. Add anything that's missing.
+// Main author: Keir Mierle
+
+#include <Eigen/Core>
+#include <Eigen/Array>
+
 Matrix<double, 3, 3> A;               // Fixed rows and cols. Same as Matrix3d.
 Matrix<double, 3, Dynamic> B;         // Fixed rows, dynamic cols.
 Matrix<double, Dynamic, Dynamic> C;   // Full dynamic. Same as MatrixXd.
@@ -137,11 +143,11 @@ C(i,j)            // C(i+1,j+1)       //
 
 // Solve Ax = b. Result stored in x. Matlab: x = A \ b.
 bool solved;
- solved = A.ldlt().solve(b, &x));  // A symmetric p.s.d.
+solved = A.ldlt().solve(b, &x));  // A sym. p.s.d.    #include <Eigen/Cholesky>
- solved = A.llt() .solve(b, &x));  // A symmetric p.d.
+solved = A.llt() .solve(b, &x));  // A sym. p.d.      #include <Eigen/Cholesky>
- solved = A.lu()  .solve(b, &x));  // Stable and fast.
+solved = A.lu()  .solve(b, &x));  // Stable and fast. #include <Eigen/LU>
- solved = A.qr()  .solve(b, &x));  // No pivoting.
+solved = A.qr()  .solve(b, &x));  // No pivoting.     #include <Eigen/QR>
- solved = A.svd() .solve(b, &x));  // Most stable, slowest.
+solved = A.svd() .solve(b, &x));  // Stable, slowest. #include <Eigen/SVD>
 // .ldlt() -> .matrixL() and .matrixD()
 // .llt()  -> .matrixL()
 // .lu()   -> .matrixL() and .matrixU()
@@ -154,6 +160,3 @@ C(i,j)            // C(i+1,j+1)       //
 EigenSolver<Matrix3d> eig(A);     // [vec val] = eig(A)
 eig.eigenvalues();                // diag(val)
 eig.eigenvectors();               // vec
-
-__________
-Main author: Keir Mierle