Upload app.py

app.py

@@ -26,7 +26,6 @@ with st.expander("App Information", expanded=False):
         - This app is for educational purposes and not intended for professional use.     
     """)
 
-# Initialize session state variables
 default_values = {
     'current_tab': "Instructions",
     'current_rt': {},
@@ -639,7 +638,7 @@ def display_final_rt60_compliance_check():
 
 def display_intelligibility_noise_reduction():
     st.write('''## Intelligibility Noise Reduction''')
-    
+
     st.write('''On this tab, you will calculate noise reduction using existing and new materials sound absorption
     coefficients and surface areas that were provided for reverberation time analysis. The relevant data 
     have copied to this tab for ease of reference. Note that you can update the new materials data by adding new rows
@@ -671,18 +670,20 @@ def display_intelligibility_noise_reduction():
     st.info('''The data below is a duplicate of the current room sound absorption calculated for reverberation time 
     analysis. It is provided here as a reminder of the existing materials in the room and their calculated sound 
     absorptions.''')
-    if 'df_current_absorption' in st.session_state:
+    if st.session_state.df_current_absorption is not None:
         st.dataframe(st.session_state.df_current_absorption, use_container_width=True)
+    else:
+        st.write("No data available for current room sound absorption. Please complete the previous steps.")
 
     st.write("#### Editable new materials data")
     st.info('''The editable table below is a duplicate of the new materials data from reverberation time 
        analysis. You can edit this table by adding new rows, deleting existing rows, or directly editing any 
        information in the table. Click check box on the left to delete a row. Hover over the table and click + at the 
-       top or bottom to add new rows. Note that any changes made here will automatically updated all the calculations
+       top or bottom to add new rows. Note that any changes made here will automatically update all the calculations
        on this tab and also update the new materials data for reverberation time and other reverberation time 
        calculations that are connected to that data.''')
 
-    if 'df_new_materials' in st.session_state:
+    if st.session_state.df_new_materials is not None:
         edited_df = st.data_editor(st.session_state.df_new_materials, num_rows="dynamic")
         st.session_state.df_new_materials = edited_df
 
@@ -716,10 +717,13 @@ def display_intelligibility_noise_reduction():
         Editable new materials data above''')
         st.dataframe(df_new_absorption, use_container_width=True)
         st.session_state.df_new_absorption = df_new_absorption.copy()  # Save a copy of new absorption data
+    else:
+        st.write("No data available for new materials. Please upload new materials data.")
 
     st.write("#### Calculated Noise Reduction")
-    if 'df_current_absorption' in st.session_state and 'df_new_absorption' in st.session_state:
-        current_total_absorption = st.session_state.df_current_absorption.loc[:, st.session_state.frequencies].sum().sum()
+    if st.session_state.df_current_absorption is not None and st.session_state.df_new_absorption is not None:
+        current_total_absorption = st.session_state.df_current_absorption.loc[:,
+                                   st.session_state.frequencies].sum().sum()
         new_total_absorption = st.session_state.df_new_absorption.loc[:, st.session_state.frequencies].sum().sum()
         if current_total_absorption > 0:
             noise_reduction = 10 * np.log10(new_total_absorption / current_total_absorption)
@@ -728,11 +732,12 @@ def display_intelligibility_noise_reduction():
             st.info('''The above noise reduction value is calculated total sound absorption for existing and new 
             material above. The noise reduction formula is shown below:
             NR = 10 * Log10(new materials total absorption/existing materials total absorption)
-            
-            The above formula is the same as 10 * Log10(S alpha after/S alpha before''')
 
+            The above formula is the same as 10 * Log10(S alpha after/S alpha before''')
         else:
             st.error("Current total absorption is zero, which is not possible. Please check your data.")
+    else:
+        st.write("No data available to calculate noise reduction. Please complete the previous steps.")
 
     if st.session_state.df_sound_pressure is not None and 'noise_reduction' in st.session_state:
         st.write("#### Updated Sound Pressure Levels")
@@ -746,7 +751,8 @@ def display_intelligibility_noise_reduction():
 
         # Subtract noise reduction from each sound pressure level using log subtraction
         for col in updated_df.columns:
-            updated_df[col] = updated_df[col].apply(lambda x: 10 ** (x / 10) - 10 ** (st.session_state.noise_reduction / 10))
+            updated_df[col] = updated_df[col].apply(
+                lambda x: 10 ** (x / 10) - 10 ** (st.session_state.noise_reduction / 10))
             updated_df[col] = updated_df[col].apply(lambda x: 10 * np.log10(x) if x > 0 else 0)
 
         st.write("Updated Sound Pressure Levels:")
@@ -776,7 +782,7 @@ def display_intelligibility_noise_reduction():
         )
         st.download_button(label="Download PDF", data=pdf, file_name="Room_Acoustics_Report.pdf",
                            mime="application/pdf")
-
+            
 # Main content display based on the current tab
 if st.session_state.current_tab == "Instructions":
     display_instructions()