diff --git a/CHANGELOG.md b/CHANGELOG.md
index b1b4541..66f444e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,8 @@
+# Version 2.11.6 : Fix bug
+
+## Bug fix
+- fix bug with lup-decomposition of rationals (an abs missing)
+
 # Version 2.11.5 : Pretty print
 
 ## Bug fix
diff --git a/Cargo.toml b/Cargo.toml
index 892e7b8..8ba644b 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "mini-calc"
-version = "2.11.5"
+version = "2.11.6"
 license = "GPL-3.0-or-later"
 description = "A fully-featured minimalistic configurable rust calculator"
 homepage = "https://calc.nwa2coco.fr"
diff --git a/src/configuration/loader.rs b/src/configuration/loader.rs
index adefe34..2297061 100644
--- a/src/configuration/loader.rs
+++ b/src/configuration/loader.rs
@@ -131,7 +131,7 @@ pub fn load_color(string: String) -> Color {
 
 pub fn replace_variable(str: String) -> String {
     str.replace("%author%", "Charlotte Thomas")
-        .replace("%version%", "v2.11.5")
+        .replace("%version%", "v2.11.6")
         .to_string()
 }
 
diff --git a/src/main.rs b/src/main.rs
index 11d65cc..9254ef1 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -279,7 +279,7 @@ fn main() {
     let style = &loaded.clone().prompt_style;
     let mut text = &loaded.clone().prompt;
     let mut verbose = false;
-    let version: String = "v2.11.5".to_string();
+    let version: String = "v2.11.6".to_string();
     interface.set_completer(Arc::new(CalcCompleter));
     interface
         .set_prompt(&format!(
diff --git a/src/parsing/ast.rs b/src/parsing/ast.rs
index 67fab41..71153a0 100644
--- a/src/parsing/ast.rs
+++ b/src/parsing/ast.rs
@@ -188,7 +188,7 @@ impl Parameters {
                         for y in x.clone() {
                             let vs = vec![" "; (max_size - y.len()) / 2];
                             let vs2 = vec![" "; (max_size - y.len()) - vs.len()];
-                            new_line.push(format!("{}{}{}", vs.join(""), y, vs2.join("")));
+                            new_line.push(format!("{}{}{}", vs2.join(""), y, vs.join("")));
                         }
 
                         final_v.push(new_line);
@@ -292,6 +292,7 @@ impl Parameters {
         match self {
             Parameters::Int(i) => Parameters::Int(i.abs()),
             Parameters::Float(f) => Parameters::Float(f.abs()),
+            Parameters::Rational(r) => Parameters::Rational(r.abs()),
             Parameters::Identifier(s) => match ram {
                 None => Parameters::Null,
                 Some(t) => {
diff --git a/src/utils/matrix_utils.rs b/src/utils/matrix_utils.rs
index 61924d9..b696937 100644
--- a/src/utils/matrix_utils.rs
+++ b/src/utils/matrix_utils.rs
@@ -73,7 +73,7 @@ pub fn lup_decompose(
 
     for i in 0..n {
         max_a = Parameters::Float(0.0);
-        i_max = 0;
+        i_max = i;
 
         for k in i..n {
             abs_a = ((a[k])[i]).clone().abs(ram.as_deref());
@@ -82,7 +82,6 @@ pub fn lup_decompose(
                     max_a = (abs_a).clone();
                     i_max = k;
                 }
-
                 _ => (),
             }
         }
@@ -109,10 +108,9 @@ pub fn lup_decompose(
             (p)[n] = add((p)[n].clone(), Parameters::Int(1), ram.as_deref());
         }
 
-        for j in i + 1..n {
+        for j in (i + 1)..n {
             (a)[j][i] = divide((a)[j][i].clone(), (a)[i][i].clone(), ram.as_deref());
-
-            for k in i + 1..n {
+            for k in (i + 1)..n {
                 (a)[j][k] = minus(
                     (a)[j][k].clone(),
                     mult((a)[j][i].clone(), (a)[i][k].clone(), ram.as_deref()),
@@ -131,7 +129,6 @@ pub fn lup_determinant(
     ram: Option<&HashMap<String, Parameters>>,
 ) -> Parameters {
     let mut det: Parameters = (&a[0][0]).clone();
-
     for i in 1..n {
         det = mult(det.clone(), (&a[i][i]).clone(), ram.as_deref())
     }