On May 8, 2010, at 9:51 PM, Gökhan Sever wrote: > > > > On Sat, May 8, 2010 at 9:29 PM, Eric Firing <efir...@hawaii.edu> wrote: > On 05/08/2010 04:16 PM, Ryan May wrote: > > On Sat, May 8, 2010 at 7:52 PM, Gökhan Sever<gokhanse...@gmail.com> wrote: > >> > >> AttributeError: can't set attribute > >> > >> Why this assignment fails? I want to set each element in the original > >> basic.data['Air_Temp'].data to another value. (Because the main instrument > >> was forgotten to turn on for that day, and I am using a secondary > >> measurement data for Air Temperature for my another calculation. However it > >> fails. Although single assignment works: > >> > >> I[13]: basic.data['Air_Temp'].data[0] = 30 > >> > >> Shouldn't this be working like the regular NumPy arrays do? > > > > Based on the traceback, I'd say it's because you're trying to replace > > the object pointed to by the .data attribute. Instead, try to just > > change the bits contained in .data: > > > > basic.data['Air_Temp'].data[:] = np.ones(len(basic.data['Air_Temp']))*30 > > Also, you since you are setting all elements to a single value, you > don't need to generate an array on the right-hand side. And, you don't > need to manipulate ".data" directly--I think it is best to avoid doing > so. Consider:
Yep. The "data" attribute is in fact a read-only property that retuns a view of the masked array as a standard ndarray. If you need to set individual values, just do so on the masked array. If you need to mask a value, use the syntax >>> yourarray[yourindex] = np.ma.masked _______________________________________________ NumPy-Discussion mailing list NumPy-Discussion@scipy.org http://mail.scipy.org/mailman/listinfo/numpy-discussion
