utions you've outlined.
Thanks again!
-paul
From: numpy-discussion-boun...@scipy.org
[mailto:numpy-discussion-boun...@scipy.org] On Behalf Of John Salvatier
Sent: Wednesday, August 04, 2010 6:23 PM
To: Discussion of Numerical Python
Subject: Re: [Numpy-discussion] Quick array value assignme
Perhaps try the following:
1) sort x by x[:,0]
2) sort y by y[:,0]
3) loop through both at the same time building an array of indexes A that
tells you the index of y[i,0] in x or just building a new array z with the
value if you don't need them in order
4) if you do need them in order, unsort A by
How exactly are you looping? That sounds absurdly slow.
What you need is a fast dictionary.
On Wed, Aug 4, 2010 at 6:00 PM, Gökhan Sever wrote:
>
>
> On Wed, Aug 4, 2010 at 6:59 PM, wrote:
>
>> Hey folks,
>>
>> I've one array, x, that you could define as follows:
>> [[1, 2.25],
>> [2, 2.50],
On Wed, Aug 4, 2010 at 8:00 PM, Gökhan Sever wrote:
>
>
> On Wed, Aug 4, 2010 at 6:59 PM, wrote:
>
>> Hey folks,
>>
>> I've one array, x, that you could define as follows:
>> [[1, 2.25],
>> [2, 2.50],
>> [3, 2.25],
>> [4, 0.00],
>> [8, 0.00],
>> [9, 2.75]]
>>
>> Then my second array, y, is:
On Wed, Aug 4, 2010 at 6:59 PM, wrote:
> Hey folks,
>
> I've one array, x, that you could define as follows:
> [[1, 2.25],
> [2, 2.50],
> [3, 2.25],
> [4, 0.00],
> [8, 0.00],
> [9, 2.75]]
>
> Then my second array, y, is:
> [[1, 0.00],
> [2, 0.00],
> [3, 0.00],
> [4, 0.00],
> [5, 0.00],
>
ere.
-paul
From: numpy-discussion-boun...@scipy.org
[mailto:numpy-discussion-boun...@scipy.org] On Behalf Of John Salvatier
Sent: Wednesday, August 04, 2010 5:34 PM
To: Discussion of Numerical Python
Subject: Re: [Numpy-discussion] Quick array value assignment based on common
values
Are they num
> Is there a concise, Numpythonic way to copy the values of x[:,1] over to
> y[:,1] where x[:,0] = y[:,0]? Resulting in, z:
First use
mask = (x[:,0] == y[:,0]) # integers
or
mask = np.abs(x[:,0] - y[:,0]) < eps # floats
and then
y[mask,1] = x[mask,1]
Sturla
__
Are they numbered like that? If so you can index into the first array by the
second one.
x[y[:,0], 1] if you can't get them into an indexable format, I think it's
going to be slow no matter how you do it.
On Wed, Aug 4, 2010 at 4:59 PM, wrote:
> Hey folks,
>
> I've one array, x, that you could d
Hey folks,
I've one array, x, that you could define as follows:
[[1, 2.25],
[2, 2.50],
[3, 2.25],
[4, 0.00],
[8, 0.00],
[9, 2.75]]
Then my second array, y, is:
[[1, 0.00],
[2, 0.00],
[3, 0.00],
[4, 0.00],
[5, 0.00],
[6, 0.00],
[7, 0.00],
[8, 0.00],
[9, 0.00],
[10,0.00]]
Is there a
