Pretty print SciPy array

Question

I have an array that looks like this:

[[  9.71369349e+02   1.06915603e+03   1.14821723e+03   3.16300000e+02]
 [  1.83700564e+03   1.85500390e+03   1.87149745e+03   7.69400000e+01]
 ...,
 [  1.00000000e+20   5.56290955e+02   7.92477067e+02   4.34600000e+01]]

How can I pretty print this so that the values are not exponentiated?

I've tried using:

sp.set_printoptions(suppress=True)

This had no effect.

What happened exactly? Because it works decently (see e.g. this post for example http://stackoverflow.com/questions/2891790/pretty-printing-of-numpy-array). — Aleksander Lidtke, Aug 09 '13 at 11:25
The array prints with the same format (as in my example) regardless of `set_printoptions`. — turtle, Aug 09 '13 at 11:32
I can confirm that `set_printoptions` is working as `sp.set_printoptions(precision=3)` formats correctly, albeit still showing the exponents (`9.713e+02`), which is not what I want. — turtle, Aug 09 '13 at 11:33
Can you post the relevant part of your code where you set the options and print the array? Also, which version of python are you using? — Aleksander Lidtke, Aug 09 '13 at 11:54

score 3 · Accepted Answer · answered Aug 09 '13 at 12:00

To remove all exponentiation you need to call the formatter argument. Modifying the example in the docs, something like this should do the trick:

sp.set_printoptions(formatter={"float": lambda x: '{:.20f}'.format(x)})

This uses string formatting to print a fixed point number(that is the 'f') with 20 decimal places. So 9.71369349e+02 is represented as 971.36934900000005654874. You will need to decide exactly how to handle this number of decimal places.

Pretty print SciPy array

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