diff --git a/src/main.rs b/src/main.rs
index 9f95da8..ec89798 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -229,6 +229,41 @@ fn handle_global_var(
     }
 }
 
+fn register_cells_function(
+    composer: &mut composer::TopLevelComposer,
+    resolver: Arc<dyn nac3core::symbol_resolver::SymbolResolver + Send + Sync>,
+    internal_resolver: &ResolverInternal,
+    name: &str,
+    signature: typedef::FunSignature,
+) {
+    let ty = composer.unifier.add_ty(typedef::TypeEnum::TFunc(signature));
+    let name_ref = name.into();
+    let mut function_def = composer::TopLevelComposer::make_top_level_function_def(
+        name.to_string(),
+        name_ref,
+        ty,
+        Some(resolver.clone()),
+        None,
+    );
+    if let toplevel::TopLevelDef::Function {
+        ref mut instance_to_symbol,
+        ..
+    } = function_def
+    {
+        instance_to_symbol.insert("".to_string(), "__nac3_cells_".to_string() + name);
+    } else {
+        unreachable!();
+    };
+    composer
+        .definition_ast_list
+        .push((RwLock::new(function_def).into(), None));
+    internal_resolver.add_id_def(
+        name_ref,
+        toplevel::DefinitionId(composer.definition_ast_list.len() - 1),
+    );
+    internal_resolver.add_id_type(name_ref, ty);
+}
+
 fn compile(code: &String, run_symbol: &String, output_filename: &Path) -> Result<(), String> {
     let mut target_machine_options = codegen::CodeGenTargetMachineOptions::from_host();
     target_machine_options.reloc_mode = inkwell::targets::RelocMode::PIC;
@@ -263,6 +298,56 @@ fn compile(code: &String, run_symbol: &String, output_filename: &Path) -> Result
         as Arc<dyn nac3core::symbol_resolver::SymbolResolver + Send + Sync>;
     let irrt = codegen::irrt::load_irrt(&context, resolver.as_ref());
 
+    let list_tvar = if let typedef::TypeEnum::TObj { params, .. } =
+        &*composer.unifier.get_ty_immutable(primitive.list)
+    {
+        typedef::iter_type_vars(params).nth(0).unwrap()
+    } else {
+        unreachable!()
+    };
+    let list_float = composer
+        .unifier
+        .subst(
+            primitive.list,
+            &typedef::into_var_map([typedef::TypeVar {
+                id: list_tvar.id,
+                ty: primitive.float,
+            }]),
+        )
+        .unwrap();
+    register_cells_function(
+        &mut composer,
+        resolver.clone(),
+        internal_resolver.as_ref(),
+        "slider",
+        typedef::FunSignature {
+            args: vec![typedef::FuncArg {
+                name: "prev".into(),
+                ty: primitive.float,
+                default_value: None,
+                is_vararg: false,
+            }],
+            ret: primitive.float,
+            vars: typedef::VarMap::new(),
+        },
+    );
+    register_cells_function(
+        &mut composer,
+        resolver.clone(),
+        internal_resolver.as_ref(),
+        "plot",
+        typedef::FunSignature {
+            args: vec![typedef::FuncArg {
+                name: "data".into(),
+                ty: list_float,
+                default_value: None,
+                is_vararg: false,
+            }],
+            ret: primitive.none,
+            vars: typedef::VarMap::new(),
+        },
+    );
+
     let parser_result =
         match nac3parser::parser::parse_program(code.as_str(), String::from("cell1").into()) {
             Ok(parser_result) => parser_result,
@@ -324,41 +409,6 @@ fn compile(code: &String, run_symbol: &String, output_filename: &Path) -> Result
         }
     }
 
-    let ty = composer
-        .unifier
-        .add_ty(typedef::TypeEnum::TFunc(typedef::FunSignature {
-            args: vec![typedef::FuncArg {
-                name: "value".into(),
-                ty: primitive.float,
-                default_value: None,
-                is_vararg: false,
-            }],
-            ret: primitive.float,
-            vars: typedef::VarMap::new(),
-        }));
-    let name_ref = "slider".into();
-    let mut function_def = composer::TopLevelComposer::make_top_level_function_def(
-            "slider".to_string(),
-            name_ref,
-            ty,
-            Some(resolver.clone()),
-            None,
-        );
-    if let toplevel::TopLevelDef::Function { ref mut instance_to_symbol, .. } = function_def {
-        instance_to_symbol.insert("".to_string(), "__nac3_cells_slider".to_string());
-    } else {
-        unreachable!();
-    };
-    composer.definition_ast_list.push((
-        RwLock::new(function_def).into(),
-        None,
-    ));
-    internal_resolver.add_id_def(
-        name_ref,
-        toplevel::DefinitionId(composer.definition_ast_list.len() - 1),
-    );
-    internal_resolver.add_id_type(name_ref, ty);
-
     let signature = typedef::FunSignature {
         args: vec![],
         ret: primitive.none,