add snippet for sub/super diagonal

fix a few doc issues

1 files changed, 5 insertions, 0 deletions

diff --git a/doc/snippets/MatrixBase_diagonal_int.cpp b/doc/snippets/MatrixBase_diagonal_int.cpp
new file mode 100644
index 000000000..0e73d1c16
--- /dev/null
+++ b/doc/snippets/MatrixBase_diagonal_int.cpp
@@ -0,0 +1,5 @@
+Matrix4i m = Matrix4i::Random();
+cout << "Here is the matrix m:" << endl << m << endl;
+cout << "Here are the coefficients on the 1st super-diagonal and 2nd sub-diagonal of m:" << endl
+     << m.diagonal<1>().transpose() << endl
+     << m.diagonal<-2>().transpose() << endl;