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Update baroclinic.py #17

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Update baroclinic.py #17

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4 changes: 3 additions & 1 deletion oceanmodes/baroclinic.py
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Original file line number Diff line number Diff line change
Expand Up @@ -117,6 +117,8 @@ def _neutral_modes_from_N2_profile_raw(z, N2, f0, depth=None, **kwargs):
# make sure z is increasing
if not np.all(dzc > 0):
raise ValueError('z should be monotonically increasing')
if z[0] == 0:
raise ValueError('z[0] should be non-zero, as it is a point where gradient quantity (N2) is defined')
if depth is None:
depth = z[-1] + dzc[-1]/2
else:
Expand Down Expand Up @@ -582,4 +584,4 @@ def _instability_analysis_from_N2_profile_raw(zc, N2, f0, beta, k, l, zf, ubar,

# return the first 'num' leading modes
return zf, omega[:num], psi[:, :num]