Install yasnippet and vala-snippets packages

elpa/yasnippet-20160924.2001/snippets/octave-mode/for

@@ -0,0 +1,7 @@
+# -*- mode: snippet -*-
+# name: for
+# key: for
+# --
+for ${1:var} = ${2:expr}
+    $0
+endfor

elpa/yasnippet-20160924.2001/snippets/octave-mode/function

@@ -0,0 +1,7 @@
+# -*- mode: snippet -*-
+# name: function
+# key: fun
+# --
+function ${1:return_val} = ${2:fname}(${3:args})
+          $0
+endfunction

elpa/yasnippet-20160924.2001/snippets/octave-mode/if

@@ -0,0 +1,9 @@
+# -*- mode: snippet -*-
+# name: if
+# key: if
+# --
+if ${1:cond}
+   $0
+${2:else
+        ${3:other}}
+endif