Printing individual array elements with at least 15 significant digits
Hello, I need to print individual elements of a float64 array to a text file. However in the file I only get 12 significant digits, the same as with:
a = np.zeros(3) a.fill(1./3) print a[0] 0.333333333333 len(str(a[0])) - 2 12
whereas
len(repr(a[0])) - 2 17
which makes more sense since I am expecting at least 15 significant digits… So how can I print a np.float64 with at least 15 significant digits (without repr!)?
On 15.10.2011, at 9:21PM, Hugo Gagnon wrote:
I need to print individual elements of a float64 array to a text file. However in the file I only get 12 significant digits, the same as with:
a = np.zeros(3) a.fill(1./3) print a[0] 0.333333333333 len(str(a[0])) - 2 12
whereas
len(repr(a[0])) - 2 17
which makes more sense since I am expecting at least 15 significant digits…
So how can I print a np.float64 with at least 15 significant digits (without repr!)?
You mean like
'%.15e' % (1./3) '3.333333333333333e-01' ?
If you are using e.g. savetxt to print to the file, you can specify the format the same way (actually the default for savetxt is already "%.18e", which should satisfy your demands). HTH, Derek
participants (2)
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Derek Homeier -
Hugo Gagnon