diff --git a/src/encpt/math/derive.rs b/src/encpt/math/derive.rs
new file mode 100644
index 0000000..47649d7
--- /dev/null
+++ b/src/encpt/math/derive.rs
@@ -0,0 +1 @@
+pub fn derive_fnct(drv_times: i32, fnct: Vec<i32>) {}
diff --git a/src/encpt/math/matrix.rs b/src/encpt/math/matrix.rs
index 1a2d68f..2d7f2f6 100644
--- a/src/encpt/math/matrix.rs
+++ b/src/encpt/math/matrix.rs
@@ -1,44 +1,69 @@
-use crate::shared::parse::split_string;
+use std::f64;
+pub fn calc_n(chunk_len: usize) -> usize {
+    let mut n = (chunk_len as f64).sqrt().round() as usize;
+    let dif = n * n;
+    if chunk_len > dif {
+        n = n + 1
+    }
+    n
+}
 
-pub fn char_to_mtrx(chars: Vec<Vec<String>>) -> Vec<Vec<Vec<i32>>> {
-    let final_vec: Vec<Vec<Vec<i32>>> = chars
+pub fn char_to_mtrx(chars: Vec<Vec<String>>) -> Vec<Vec<i32>> {
+    let final_vec: Vec<Vec<i32>> = chars
         .into_iter()
-        .map(|e| {
-            e.iter()
-                .map(|c| {
-                    split_string(c.to_string())
-                        .iter()
-                        .map(|r| r.parse::<i32>().unwrap())
-                        .collect()
-                })
-                .collect()
-        })
+        .map(|e| e.iter().map(|c| c.parse::<i32>().unwrap()).collect())
         .collect();
     final_vec
 }
+
 // from [["145","456","789"],["741","789","123"]]
 
 // to [[[1,4,5],[4,5,6],[7,8,9]],[[7,4,1],[7,8,9],[1,2,3]]]
+pub fn fill_mtrx_gaps(n: usize, orgnl_mtrx: Vec<Vec<i32>>) -> Vec<Vec<i32>> {
+    let filled_mtrx: Vec<Vec<i32>> = orgnl_mtrx
+        .iter()
+        .map(|c| {
+            let mut row = c.clone(); // Create a new row based on the original row
+            if row.len() < n {
+                // If the row is shorter than n, extend it with zeros
+                row.extend(std::iter::repeat(0).take(n - row.len()));
+            }
+            row // Return the modified row
+        })
+        .collect();
+
+    filled_mtrx
+}
 
 #[cfg(test)]
 mod tests {
-    use crate::shared::parse::str2String_vec;
-
     use super::*;
+    use crate::shared::parse::str2_string_vec;
 
     #[test]
     fn mtrx_vals() {
-        let expected = vec![
-            vec![vec![1, 4, 5], vec![4, 5, 6], vec![7, 8, 9]],
-            vec![vec![7, 4, 1], vec![7, 8, 9], vec![1, 2, 3]],
-        ];
+        let expected = vec![vec![145, 456, 789], vec![741, 789, 123]];
         let nstd_vec = vec![vec!["145", "456", "789"], vec!["741", "789", "123"]];
         let res = char_to_mtrx(
             nstd_vec
                 .iter()
-                .map(|c| str2String_vec(c.to_vec()))
+                .map(|c| str2_string_vec(c.to_vec()))
                 .collect(),
         );
         assert_eq!(res, expected)
     }
+
+    #[test]
+    fn calc_n_test1() {
+        let e = 28;
+        let res = calc_n(e);
+        assert_eq!(res, 6);
+    }
+
+    #[test]
+    fn calc_n_test2() {
+        let e = 25;
+        let res = calc_n(e);
+        assert_eq!(res, 5);
+    }
 }
diff --git a/src/main.rs b/src/main.rs
index f61654e..8c8f5dd 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,4 +1,7 @@
-use crate::{encpt::mapping::mapper::*, shared::parse::str2String_vec};
+use crate::{
+    encpt::{mapping::mapper::*, math::matrix::fill_mtrx_gaps},
+    shared::parse::str2_string_vec,
+};
 use encpt::{mapping::switcher::switch_chars, math::matrix::char_to_mtrx};
 pub mod maps {
     pub mod chars;
@@ -32,11 +35,24 @@ fn main() {
     // let res = chr_to_mxas(charvc);
     // println!("{:?}", res)
 
-    let vecs = vec![
-        vec!["785", "535", "789", "987", "123"],
-        vec!["543", "528", "693", "285", "147"],
-        vec!["753"],
+    // let vecs = vec![
+    //     vec!["785", "535", "789", "987", "123"],
+    //     vec!["543", "528", "693", "285", "147"],
+    //     vec!["753"],
+    // ];
+    // let res = char_to_mtrx(vecs.iter().map(|c| str2_string_vec(c.to_vec())).collect());
+    // println!("{:?}", res);
+
+    let vecs1 = vec![
+        vec![785, 535, 789, 987, 123, 789],
+        vec![785, 535, 789, 987, 123, 787],
+        vec![785, 535, 789, 987, 123, 456],
+        vec![543, 528, 693, 285, 147, 556],
+        vec![753, 456, 456, 564],
+        vec![],
     ];
-    let res = char_to_mtrx(vecs.iter().map(|c| str2String_vec(c.to_vec())).collect());
-    println!("{:?}", res)
+    let res1 = fill_mtrx_gaps(6, vecs1);
+    for a in res1 {
+        println!("{:?}", a);
+    }
 }
diff --git a/src/shared/parse.rs b/src/shared/parse.rs
index 91e9f9a..3ffa71e 100644
--- a/src/shared/parse.rs
+++ b/src/shared/parse.rs
@@ -16,15 +16,20 @@ pub fn flatten_vec(nstd: Vec<String>) -> Vec<String> {
     flatten
 }
 
-pub fn str2String_vec(nsrd: Vec<&str>) -> Vec<String> {
+pub fn str2_string_vec(nsrd: Vec<&str>) -> Vec<String> {
     let nsrd_as_strings: Vec<String> = nsrd.iter().map(|&s| s.to_string()).collect();
     nsrd_as_strings
 }
 
-pub fn split_by_five(chunk: Vec<String>) -> Vec<Vec<String>> {
-    let split_vectors: Vec<Vec<String>> = chunk.chunks(5).map(|chunk| chunk.to_vec()).collect();
+// need to change
+pub fn split_by_n(n: usize, chunk: Vec<String>) -> Vec<Vec<String>> {
+    let mut split_vectors: Vec<Vec<String>> = chunk.chunks(n).map(|chunk| chunk.to_vec()).collect();
+    if split_vectors.len() < n {
+        split_vectors.push(vec![]);
+    }
     split_vectors
 }
+
 #[cfg(test)]
 mod tests {
     use super::*;
@@ -62,7 +67,25 @@ mod tests {
     #[test]
     fn flatten_test() {
         let nsrd = vec!["Av", "bQ", "TG"];
-        let res = flatten_vec(str2String_vec(nsrd));
+        let res = flatten_vec(str2_string_vec(nsrd));
         assert_eq!(res, vec!["A", "v", "b", "Q", "T", "G"])
     }
+    #[test]
+    fn split_by_6_28_elemnets() {
+        let ele = vec![
+            "785", "535", "789", "987", "123", "789", "785", "535", "789", "987", "123", "787",
+            "785", "535", "789", "987", "123", "456", "543", "528", "693", "285", "147", "556",
+            "753", "456", "456", "564",
+        ];
+        let exp = vec![
+            vec!["785", "535", "789", "987", "123", "789"],
+            vec!["785", "535", "789", "987", "123", "787"],
+            vec!["785", "535", "789", "987", "123", "456"],
+            vec!["543", "528", "693", "285", "147", "556"],
+            vec!["753", "456", "456", "564"],
+            vec![],
+        ];
+        let res = split_by_n(6, str2_string_vec(ele));
+        assert_eq!(res, exp)
+    }
 }