--- a/COBRAxy/flux_simulation_beta.py	Mon Sep 22 15:14:47 2025 +0000
+++ b/COBRAxy/flux_simulation_beta.py	Mon Sep 22 15:23:09 2025 +0000
@@ -47,9 +47,9 @@
         help="upload mode: True for model+bounds, False for complete models")
     
     parser.add_argument("-ens", "--sampling_enabled", type=str,
-        choices=['True', 'False'],
+        choices=['true', 'false'],
         required=True,
-        help="enable sampling: True for sampling, False for no sampling")
+        help="enable sampling: 'true' for sampling, 'false' for no sampling")
     
     parser.add_argument('-ol', '--out_log',
                         help="Output log")
@@ -348,7 +348,7 @@
         List[pd.DataFrame]: A list of DataFrames containing statistics and analysis results.
     """
 
-    if ARGS.sampling_enabled == "True" and ARGS.n_samples > 0:
+    if ARGS.sampling_enabled == "true" and ARGS.n_samples > 0:
     
         if ARGS.algorithm == 'OPTGP':
             OPTGP_sampler(model_input, cell_name, ARGS.n_samples, ARGS.thinning, ARGS.n_batches, ARGS.seed)
@@ -499,7 +499,7 @@
     ARGS.output_type_analysis = ARGS.output_type_analysis.split(",") if ARGS.output_type_analysis else []
 
     # Determine if sampling should be performed
-    if ARGS.sampling_enabled == "True" and ARGS.n_samples > 0:
+    if ARGS.sampling_enabled == "true" and ARGS.n_samples > 0:
         perform_sampling = True
 
     print("=== INPUT FILES ===")