Checked if the recodings are empty (#460)

* Checked if the recodings are empty, if so raise an  error.

---------

Co-authored-by: deezer257 <florian@Florian>

jaxley/integrate.py

@@ -102,6 +102,8 @@ def integrate(
     for key in externals.keys():
         externals[key] = externals[key].T  # Shape `(time, num_stimuli)`.
 
+    if module.recordings.empty:
+        raise ValueError("No recordings are set. Please set them.")
     rec_inds = module.recordings.rec_index.to_numpy()
     rec_states = module.recordings.state.to_numpy()
 

tests/test_record_and_stimulate.py

@@ -2,6 +2,7 @@
 # licensed under the Apache License Version 2.0, see <https://www.apache.org/licenses/>
 
 import jax
+import pytest
 
 jax.config.update("jax_enable_x64", True)
 jax.config.update("jax_platform_name", "cpu")
@@ -121,3 +122,12 @@ def test_record_synaptic_and_membrane_states():
         # On average the membrane trace spikes around 0 steps after voltage.
         offset_mem = 0
         assert np.all(np.abs(maxima_3 - maxima_1 - offset_mem)) < 5.0
+
+
+def test_empty_recordings():
+    # Create an empty compartment
+    comp = jx.Compartment()
+
+    # Check if a ValueError is raised when integrating an empty compartment
+    with pytest.raises(ValueError):
+        v = jx.integrate(comp, delta_t=0.025, t_max=10.0)