How to get entries of array with separated by string in one line?

Question

I have this data

[[ 2.696000e+00  0.000000e+00  0.000000e+00  0.000000e+00]
 [ 2.577000e+00  0.000000e+00  0.000000e+00  0.000000e+00]
 [ 0.000000e+00 -2.560096e+03  0.000000e+00  0.000000e+00]
...

and want to print it as such, for each row

2.696000e+00 & 0.000000e+00 & 0.000000e+00 & 0.000000e+00 //
2.577000e+00 & 0.000000e+00 & 0.000000e+00 & 0.000000e+00 //
...

I have done is

for k in range(1):
for i in range(len(data[k])):
    print(data[k][i],'&')
    if i == len(data[k])-1:
        print(data[k][i],'//')

Which outputs

2.696 &
0.0 &
0.0 &
0.0 &
0.0 //

How to get rid of the new line between each entry of the row?

``print(data[1][i],'&', end= " ")`` And you dont need ``for k in range(1):`` just replace ``k`` with zero in every line — Psytho, Jul 05 '23 at 19:19
Does this answer your question? [How to print without a newline or space](https://stackoverflow.com/questions/493386/how-to-print-without-a-newline-or-space) — Psytho, Jul 05 '23 at 19:20

score 5 · Accepted Answer · answered Jul 05 '23 at 19:18

5

You can use str.join to join the numbers by & and then print // as last string:

data = [
    [2.696000e00, 0.000000e00, 0.000000e00, 0.000000e00],
    [2.577000e00, 0.000000e00, 0.000000e00, 0.000000e00],
    [0.000000e00, -2.560096e03, 0.000000e00, 0.000000e00],
]

for row in data:
    print(' & '.join(map(str, row)), '//')

Prints:

2.696 & 0.0 & 0.0 & 0.0 //
2.577 & 0.0 & 0.0 & 0.0 //
0.0 & -2560.096 & 0.0 & 0.0 //

answered Jul 05 '23 at 19:18

Andrej Kesely

168,389
15
48
91

They appear to be using a 2d numpy array. Will this work for that? – Barmar Jul 05 '23 at 19:23
@Barmar Yes, even with `data = np.array([ ... ])` it still works. – Andrej Kesely Jul 05 '23 at 19:25
1

yep, thats exactly it, thx – Lyu Jul 05 '23 at 19:25

Muhammad Ali · Answer 2 · 2023-07-05T19:31:51.153

1

Just use the join functions

' & '.join(map(lambda s: '%E'%s, [2.696000e00, 0.000000e00, 0.000000e00, 0.000000e00]))

Outputs

'2.696000E+00 & 0.000000E+00 & 0.000000E+00 & 0.000000E+00'

With the above approach, you can just do one loop and convert the array into a string with your preferred join character.

The map function is required to convert the decimal values to string. The lambda fn just formats the decimal into string using the E notation. A 'str' mapping would get rid of the 0s. See this for details.

If you just want to stop print from spitting out newline, check this

Edit1: Updated code with map example

edited Jul 05 '23 at 19:31

answered Jul 05 '23 at 19:21

Muhammad Ali

712
7
14

Their input is a 2d numpy array. Will this work with that? – Barmar Jul 05 '23 at 19:24
Pls excuse me, it doesn't work. That was a rookie mistake from me. You'd need the map function like Andrej suggested. I'll update my answer – Muhammad Ali Jul 05 '23 at 19:24

How to get entries of array with separated by string in one line?

2 Answers2