File size: 2,226 Bytes
8bf8fb9 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 | import streamlit as st
from pysd import read_vensim, read_xmile
import pandas as pd
import matplotlib.pyplot as plt
import tempfile
import os
st.set_page_config(page_title="System Dynamics Simulator", layout="wide")
st.title("📈 System Dynamics Simulator using PySD")
st.markdown("Upload a **.mdl** or **.xmile** file to simulate and visualize system dynamics models.")
uploaded_file = st.file_uploader("Choose a Vensim (.mdl) or XMILE (.xmile) file", type=["mdl", "xmile"])
if uploaded_file is not None:
suffix = os.path.splitext(uploaded_file.name)[-1].lower()
with tempfile.NamedTemporaryFile(delete=False, suffix=suffix) as tmp_file:
tmp_file.write(uploaded_file.getvalue())
model_path = tmp_file.name
try:
if suffix == ".mdl":
model = read_vensim(model_path)
elif suffix == ".xmile":
model = read_xmile(model_path)
else:
st.error("Unsupported file format.")
st.stop()
st.success("✅ Model loaded successfully!")
st.sidebar.header("Simulation Settings (ignored in PySD<3.x)")
initial_time = st.sidebar.number_input("Initial Time", value=0)
final_time = st.sidebar.number_input("Final Time", value=100)
time_step = st.sidebar.number_input("Time Step", value=1.0)
if st.sidebar.button("Run Simulation"):
result = model.run()
st.subheader("📊 Simulation Output")
st.dataframe(result)
st.subheader("📉 Plot Time-Series")
selected_vars = st.multiselect("Select variables to plot", result.columns.tolist(), default=result.columns.tolist())
if selected_vars:
for var in selected_vars:
fig, ax = plt.subplots()
ax.plot(result.index, result[var], label=var)
ax.set_xlabel("Time")
ax.set_ylabel(var)
ax.set_title(f"{var} over Time")
ax.grid(True)
st.pyplot(fig)
else:
st.warning("Select at least one variable to plot.")
except Exception as e:
st.error(f"❌ Error: {str(e)}") |