[Numpy-discussion] different values for ndarray when printed with or without
Nissim Derdiger
NissimD at elspec-ltd.com
Wed Oct 18 13:30:50 EDT 2017
Hi,
The reason I've didn't send an example, is that in order to reproduce this issue - you'll need to have a meter that uses Modbus communication protocol in order to get a valid response object.
(it's the output of "read_holding_registers" function on pymodbus3, which is has almost no documentation AT ALL)
Is there a way to "export" an object so I'll be able to send it here?
One of the parameters in this object is a regular list, but when I replace it with a list of my own (same values same everything) - the issue is not reproduced.
(when looking in the watch list of the PyCharm - both are registered as <class 'list'>)
That's why I figured I'll ask without example and maybe this is a simple or known issue that can be answered without it.
To answer your questions:
1. Dtype is float32
2. shape is <class 'tuple'>: (4,)
3. difference between values are:
[ 2.25699615e+02 5.51561475e-01 3.81394744e+00 1.03807904e-01]
Instead of:
[225.69961547851562, 0.5515614748001099, 3.8139474391937256, 0.10380790382623672]
4. I've only used the word "list" in the mail example and not in my code..
Anyway, the basic code looks like this:
def func():
Input = [17249, 45850, 16141, 13090, 16500, 6071, 15828, 39229] #usually this would be: Input = payload.registers
Result = np.array(Input, dtype='>u2')
Result = np.frombuffer(Result.data, dtype='>u4')
Result = np.array(Result, dtype='<u4')
Result = np.frombuffer(Result.data, dtype='f4')
Return Result
Now, this is where it gets even more strange:
I'm calling this function from another *.py file.
If I'll print it here - no matter with or without [] - it will give these values:
[ 2.25699615e+02 5.51561475e-01 3.81394744e+00 1.03807904e-01]
But if I'll print it like this: print(Result.tolist()) - it'll give the correct values:
[225.69961547851562, 0.5515614748001099, 3.8139474391937256, 0.10380790382623672]
But when I copied the function to the same file I called it before - print(Result[0::]) also return the correct values...
I know it's not the most specific and detailed problem, so any ideas as to how to make it more so will be much appreciated..
Thanks again,
Nissim.
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Today's Topics:
1. different values for ndarray when printed with or without [ ]
(Nissim Derdiger)
2. Re: different values for ndarray when printed with or without
[ ] (Andras Deak)
3. Re: different values for ndarray when printed with or without
[ ] (Nicholas Nadeau)
4. Github overview change (Sebastian Berg)
----------------------------------------------------------------------
Message: 1
Date: Wed, 18 Oct 2017 10:44:22 +0000
From: Nissim Derdiger <NissimD at elspec-ltd.com>
To: "numpy-discussion at python.org" <numpy-discussion at python.org>
Subject: [Numpy-discussion] different values for ndarray when printed
with or without [ ]
Message-ID:
<9EFE3345170EF24DB67C61C1B05EEEDB407E0A02 at EX10.Elspec.local>
Content-Type: text/plain; charset="us-ascii"
Hi all,
I have a ndarray, that shows different values when called like that: print(arr) or like that print(arr[0::]).
When changing it back to a python string (with list = arr.tolist()) - both prints return same value, but when converting that list back to np array (arr=np.array(list)) - the printing issue returns.
Any ideas what may cause that?
Thanks,
Nissim.
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Message: 2
Date: Wed, 18 Oct 2017 14:25:44 +0200
From: Andras Deak <deak.andris at gmail.com>
To: Discussion of Numerical Python <numpy-discussion at python.org>
Subject: Re: [Numpy-discussion] different values for ndarray when
printed with or without [ ]
Message-ID:
<CAMEWA4O_n2oFUXGiqa=OFif8XhC7=s4_CacQu8gwzb2SVkHTfA at mail.gmail.com>
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On Wed, Oct 18, 2017 at 12:44 PM, Nissim Derdiger <NissimD at elspec-ltd.com> wrote:
> Hi all,
>
> I have a ndarray, that shows different values when called like that:
> print(arr) or like that print(arr[0::]).
>
> When changing it back to a python string (with list = arr.tolist()) ?
> both prints return same value, but when converting that list back to
> np array
> (arr=np.array(list)) ? the printing issue returns.
>
> Any ideas what may cause that?
Hi Nissim,
I suggest adding some specifics. What is the shape and dtype of your array? What are the differences in values? In what way are they different? The best would be if you could provide a minimal, reproducible example.
Regards,
Andr?s
------------------------------
Message: 3
Date: Wed, 18 Oct 2017 08:39:01 -0400
From: Nicholas Nadeau <nicholas.nadeau at gmail.com>
To: Discussion of Numerical Python <numpy-discussion at python.org>
Subject: Re: [Numpy-discussion] different values for ndarray when
printed with or without [ ]
Message-ID:
<CAH-pDf-gAgjMYEv-p8h09tZPqnpveuhjtV9gz8L9q046GqYtNA at mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
Hi Nissim,
While a working example will be helpful, I just wanted to confirm that you're not assigning a value to `list`, as you did in your message (e.g., ` list = arr.tolist()`).
Because if that's the case, then you may run into issues, as `list` is a built-in Python keyword (for the `list` class).
Cheers,
--
Nicholas Nadeau, P.Eng., AVS
On 18 October 2017 at 06:44, Nissim Derdiger <NissimD at elspec-ltd.com> wrote:
> Hi all,
>
> I have a ndarray, that shows different values when called like that:
> print(arr) or like that print(arr[0::]).
>
> When changing it back to a python string (with list = arr.tolist()) ?
> both prints return same value, but when converting that list back to
> np array
> (arr=np.array(list)) ? the printing issue returns.
>
> Any ideas what may cause that?
>
> Thanks,
>
> Nissim.
>
> _______________________________________________
> NumPy-Discussion mailing list
> NumPy-Discussion at python.org
> https://mail.python.org/mailman/listinfo/numpy-discussion
>
>
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Message: 4
Date: Wed, 18 Oct 2017 15:23:27 +0200
From: Sebastian Berg <sebastian at sipsolutions.net>
To: Discussion of Numerical Python <numpy-discussion at python.org>
Subject: [Numpy-discussion] Github overview change
Message-ID: <1508333007.27279.2.camel at sipsolutions.net>
Content-Type: text/plain; charset="utf-8"
Hi all,
probably silly, but is anyone else annoyed at not seeing comments anymore in the github overview/start page? I stopped getting everything as mails and had a (bad) habit of glancing at them which would spot at least bigger discussions going on, but now it only shows actual commits, which honestly are less interesting to me.
Probably just me, was just wondering if anyone knew a setting or so?
- Sebastian
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