@@ -53,7 +53,7 @@ def elevation_spectrum(
5353 # TODO: Add confidence intervals, equal energy frequency spacing, and NDBC
5454 # frequency spacing
5555 # TODO: may need to raise an error for the length of nnft- signal.welch breaks when nfft is too short
56- eta = convert_to_dataset (eta ,"eta" )
56+ eta = convert_to_dataset (eta , "eta" )
5757 if not isinstance (sample_rate , (float , int )):
5858 raise TypeError (
5959 f"sample_rate must be of type int or float. Got: { type (sample_rate )} "
@@ -287,11 +287,11 @@ def surface_elevation(
287287 Returns
288288 ---------
289289 eta: pandas DataFrame or xarray Dataset
290- Wave surface elevation [m] indexed by time [s]. Type depends on
290+ Wave surface elevation [m] indexed by time [s]. Type depends on
291291 number of variables in eta and value of the to_pandas flag.
292292
293293 """
294- S = convert_to_dataset (S ,"S" )
294+ S = convert_to_dataset (S , "S" )
295295 time_index = to_numeric_array (time_index , "time_index" )
296296 if not isinstance (seed , (type (None ), int )):
297297 raise TypeError (f"If specified, seed must be of type int. Got: { type (seed )} " )
@@ -373,7 +373,9 @@ def surface_elevation(
373373 if phases is None :
374374 np .random .seed (seed )
375375 phase = xr .DataArray (
376- data = 2 * np .pi * np .random .random_sample (S_subset [frequency_dimension ].shape ),
376+ data = 2
377+ * np .pi
378+ * np .random .random_sample (S_subset [frequency_dimension ].shape ),
377379 dims = frequency_dimension ,
378380 coords = {frequency_dimension : f },
379381 )
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