Like a matrix

[Yazar Yolait]

I have a string of numbers in a file like so:
0 3 23.3 352 45 4
4 45 23 54 4 5.4 .6

I need to average them horizontally and vertically. Horizontally is easy
since I'm reading one line at a time, but how can I do it vertically like 0
and 4, 3 and 45, etc.
I was thinking of a dictionary but how do you add entries to a dictionary,
you can't can you? Like I would add 0 to a dictionary that holds the 0th
column. And then when I get to line 2, I would add 4 to the dictionary
which has the 0th column data.

 

[Erik Max Francis]

I have a string of numbers in a file like so:
0 3 23.3 352 45 4
4 45 23 54 4 5.4 .6

I need to average them horizontally and vertically. Horizontally is
easy
since I'm reading one line at a time, but how can I do it vertically
like 0
and 4, 3 and 45, etc.

Why not read it into a list of lists, and then iterate both ways?

I was thinking of a dictionary but how do you add entries to a
dictionary,
you can't can you?

Sure you can:

d = {}
d[0] = 'zero'
d {0: 'zero'}
d[1] = 'one'
d {0: 'zero', 1: 'one'}
d[10] = {'a': 1, 'b': 2, 'c': 3}
d

{0: 'zero', 1: 'one', 10: {'a': 1, 'c': 3, 'b': 2}}

 

[Peter Otten]

I have a string of numbers in a file like so:
0 3 23.3 352 45 4
4 45 23 54 4 5.4 .6

I need to average them horizontally and vertically. Horizontally is easy
since I'm reading one line at a time, but how can I do it vertically like
0 and 4, 3 and 45, etc.
I was thinking of a dictionary but how do you add entries to a dictionary,
you can't can you? Like I would add 0 to a dictionary that holds the 0th
column. And then when I get to line 2, I would add 4 to the dictionary
which has the 0th column data.

from __future__ import division
def avg(alist): return sum(alist)/len(alist) ....
u = [1,2,3]
v = [3,2,1]
avg(u)

2.0

So that was the easy part. Now let's create the columns:

So that wasn't particular hard, now you see it
zip() returns tuples instead of lists, but as you see above that does no
harm.

Peter

 

[ryan scott]

Yazar Yolait wrote:

I have a string of numbers in a file like so:
0 3 23.3 352 45 4
4 45 23 54 4 5.4 .6

I need to average them horizontally and vertically. Horizontally is easy
since I'm reading one line at a time, but how can I do it vertically like
0 and 4, 3 and 45, etc.
I was thinking of a dictionary but how do you add entries to a dictionary,
you can't can you? Like I would add 0 to a dictionary that holds the 0th
column. And then when I get to line 2, I would add 4 to the dictionary
which has the 0th column data.

from __future__ import division
def avg(alist): return sum(alist)/len(alist)

...

u = [1,2,3]
v = [3,2,1]
avg(u)

2.0

So that was the easy part. Now let's create the columns:

(1, 3)
(2, 2)
2.0


So that wasn't particular hard, now you see it
zip() returns tuples instead of lists, but as you see above that does no
harm.

Peter

As an addition to this post, you could use avg in map to return a list
of your averages.
[2.0, 2.0, 2.0]


Ryan