diff --git a/lang-trials/rust-benchmark/src/engine.rs b/lang-trials/rust-benchmark/src/engine.rs
index a2661aa..04377fd 100644
--- a/lang-trials/rust-benchmark/src/engine.rs
+++ b/lang-trials/rust-benchmark/src/engine.rs
@@ -4,17 +4,8 @@ use std::f64::consts::{PI, E};
 /*use typenum::{B1, UInt, UTerm};*/
 
 /* dynamic matrices */
-pub fn rand_eigval_series<N>(time_res: usize) -> Vec<OVector<Complex<f64>, Dyn>>
-    where
-        N: ToTypenum + DimName + DimSub<U1>,
-        DefaultAllocator:
-            Allocator<N> +
-            Allocator<N, N> +
-            Allocator<<N as DimSub<U1>>::Output> +
-            Allocator<N, <N as DimSub<U1>>::Output>
-{
+pub fn rand_eigval_series(dim: usize, time_res: usize) -> Vec<OVector<Complex<f64>, Dyn>> {
     // initialize the random matrix
-    let dim = N::try_to_usize().unwrap();
     let mut rand_mat = DMatrix::<f64>::from_fn(dim, dim, |j, k| {
         let n = j*dim + k;
         E*((n*n) as f64) % 2.0 - 1.0
@@ -44,17 +35,8 @@ pub fn rand_eigval_series<N>(time_res: usize) -> Vec<OVector<Complex<f64>, Dyn>>
 }
 
 /* dynamic single float matrices */
-/*pub fn rand_eigval_series<N>(time_res: usize) -> Vec<OVector<Complex<f32>, Dyn>>
-    where
-        N: ToTypenum + DimName + DimSub<U1>,
-        DefaultAllocator:
-            Allocator<N> +
-            Allocator<N, N> +
-            Allocator<<N as DimSub<U1>>::Output> +
-            Allocator<N, <N as DimSub<U1>>::Output>
-{
+/*pub fn rand_eigval_series(dim: usize, time_res: usize) -> Vec<OVector<Complex<f32>, Dyn>> {
     // initialize the random matrix
-    let dim = N::try_to_usize().unwrap();
     let mut rand_mat = DMatrix::<f32>::from_fn(dim, dim, |j, k| {
         let n = j*dim + k;
         (E as f32)*((n*n) as f32) % 2.0_f32 - 1.0_f32
diff --git a/lang-trials/rust-benchmark/src/main.rs b/lang-trials/rust-benchmark/src/main.rs
index 9662dd7..01364e5 100644
--- a/lang-trials/rust-benchmark/src/main.rs
+++ b/lang-trials/rust-benchmark/src/main.rs
@@ -19,7 +19,8 @@ fn main() {
         on_mount(move || {
             let performance = window().unwrap().performance().unwrap();
             let start_time = performance.now();
-            let eigval_series = engine::rand_eigval_series::<U60>(time_res);
+            /*let eigval_series = engine::rand_eigval_series::<U60>(time_res);*/
+            let eigval_series = engine::rand_eigval_series(60, time_res);
             let run_time = performance.now() - start_time;
             run_time_report.set(run_time);