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getdat.dtype

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out.dtype

Let's say I have two structured arrays with dtypes as per below dtype([('Tstamp', '|O4'), ('Vf', '<f4'), ('Vq', '<f4'), ('Sf', '<f4'), ('Sq', '<f4'), ('Bt', '<f4'), ('SPL', '<f4')]) dtype([('Viscosity_cSt', '<f4'), ('Density_kgm3', '<f4'), ('GVF', '<f4')]) Then merging this per the below gives an error. Why?

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rfn.merge_arrays((getdat, out), flatten = True, usemask = False, asrecarray=False)

Traceback (most recent call last): File "<pyshell#43>", line 1, in <module> rfn.merge_arrays((getdat, out), flatten = True, usemask = False, asrecarray=False) File "C:\Python27\lib\site-packages\numpy\lib\recfunctions.py", line 458, in merge_arrays dtype=newdtype, count=maxlength) ValueError: cannot create object arrays from iterator The issue seems to be object field 'Tstamp' which contains python datetime objects. I can merge structured arrays with numeric formats. Any help much appreciated. Alex van der Spek