ValueError: need at least one array to concatenate

[1810174827]

Traceback (most recent call last):
File "C:\Users\Administrator\AppData\Roaming\Python\Python39\site-packages\pylandstats\landscape.py", line 610, in _patch_area_ser
return self._cached_patch_area_ser
AttributeError: 'Landscape' object has no attribute '_cached_patch_area_ser'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "D:\lhflearn\指数计算\landscape level1.py", line 14, in
landscape_metrics_df = za.compute_landscape_metrics_df(metrics=metrics)
File "C:\Users\Administrator\AppData\Roaming\Python\Python39\site-packages\pylandstats\multilandscape.py", line 233, in compute_landscape_metrics_df
] = landscape.compute_landscape_metrics_df(
File "C:\Users\Administrator\AppData\Roaming\Python\Python39\site-packages\pylandstats\landscape.py", line 3942, in compute_landscape_metrics_df
metrics_dict[metric] = getattr(self, metric)(**metric_kws)
File "C:\Users\Administrator\AppData\Roaming\Python\Python39\site-packages\pylandstats\landscape.py", line 1710, in area_mn
return self._metric_mn(
File "C:\Users\Administrator\AppData\Roaming\Python\Python39\site-packages\pylandstats\landscape.py", line 791, in _metric_mn
return self._metric_reduce(
File "C:\Users\Administrator\AppData\Roaming\Python\Python39\site-packages\pylandstats\landscape.py", line 777, in _metric_reduce
patch_metrics = patch_metric_method(
File "C:\Users\Administrator\AppData\Roaming\Python\Python39\site-packages\pylandstats\landscape.py", line 881, in area
area_ser = self._get_patch_area_ser(class_val=class_val)
File "C:\Users\Administrator\AppData\Roaming\Python\Python39\site-packages\pylandstats\landscape.py", line 726, in _get_patch_area_ser
patch_area_ser = self._patch_area_ser
File "C:\Users\Administrator\AppData\Roaming\Python\Python39\site-packages\pylandstats\landscape.py", line 613, in _patch_area_ser
np.concatenate(
File "<array_function internals>", line 5, in concatenate
ValueError: need at least one array to concatenate

进程已结束,退出代码1

[1810174827]

File "C:\Users\Administrator\AppData\Roaming\Python\Python39\site-packages\pylandstats\landscape.py", line 610, in _patch_area_ser
return self._cached_patch_area_ser
AttributeError: 'Landscape' object has no attribute '_cached_patch_area_ser'

[martibosch]

Closing this since I am assuming that this is actually the same as pylandstats issue 49. Feel free to reopen otherwise.