Merge pull request #861 from stan-dev/fix/860-trace_quad_form

Add vector overload for trace_quad_form

Author: spinkney

src/functions-reference/functions_index.qmd

@@ -746,10 +746,17 @@ A is symmetric and ensures that the result is also symmetric.
 The trace of the quadratic form, i.e., `trace(B' * A * B)`.
 {{< since 2.0 >}}
 
-<!-- real; trace_gen_quad_form; (matrix D,matrix A, matrix B); -->
-\index{{\tt \bfseries trace\_gen\_quad\_form }!{\tt (matrix D,matrix A, matrix B): real}|hyperpage}
+<!-- real; trace_quad_form; (matrix A, vector B); -->
+\index{{\tt \bfseries trace\_quad\_form }!{\tt (matrix A, vector B): real}|hyperpage}
 
-`real` **`trace_gen_quad_form`**`(matrix D,matrix A, matrix B)`<br>\newline
+`real` **`trace_quad_form`**`(matrix A, vector B)`<br>\newline
+The trace of the quadratic form, i.e., `trace(B' * A * B)`.
+{{< since 2.0 >}}
+
+<!-- real; trace_gen_quad_form; (matrix D ,matrix A, matrix B); -->
+\index{{\tt \bfseries trace\_gen\_quad\_form }!{\tt (matrix D, matrix A, matrix B): real}|hyperpage}
+
+`real` **`trace_gen_quad_form`**`(matrix D, matrix A, matrix B)`<br>\newline
 The trace of a generalized quadratic form, i.e., `trace(D * B' * A *
 B).`
 {{< since 2.0 >}}