[AstroPy] AstroPy Digest, Vol 155, Issue 14

Tue Aug 27 15:22:25 EDT 2019

Hi everyone

A couple of people suggested the usual plt.show()after the third line, but
that doesn't change anything I'm afraid - the histogram still doesn't work
as the example shows.

Anybody any other suggestions please?.

Best regards

Gordon

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Subject: AstroPy Digest, Vol 155, Issue 14

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Today's Topics:

   1. Re: Histogram problem in astropy tutorial (Lingyi Hu)

   2. Re: Histogram problem in astropy tutorial (David Stansby)

----------------------------------------------------------------------

Message: 1

Date: Tue, 27 Aug 2019 21:55:36 +0800

From: Lingyi Hu <hulingyi1995 at yahoo.com.sg>

To: Astronomical Python mailing list <astropy at python.org>

Subject: Re: [AstroPy] Histogram problem in astropy tutorial

Message-ID:

<CAApfPRxK4Mke2HaYmsLHWPtVL4prtWK2ekWNbS_J1NOGfQbCww at mail.gmail.com>

Content-Type: text/plain; charset="utf-8"

Hi Gordon,

I believe you can do a normal plt.show() at the end of plotting to show the
graph. Don't think you need the exec(%matplotlib inline) if you are not in
ipython. I don't use Spyder but apparently there are some settings you can
set in Spyder to make it work like a IPython notebook:

<https://stackoverflow.com/questions/23585126/how-do-i-get-interactive-plots
-again-in-spyder-ipython-matplotlib>
https://stackoverflow.com/questions/23585126/how-do-i-get-interactive-plots-
again-in-spyder-ipython-matplotlib

Lingyi

On Tue, Aug 27, 2019 at 8:13 PM Gordon Dennis <
<mailto:gordon.b.dennis at gmail.com> gordon.b.dennis at gmail.com>

wrote:

> Hi everybody

> 

> I'm having some difficulty with the example 'Galaxy mass' in the 

> tutorial at 

>  <http://learn.astropy.org/rst-tutorials/quantities.html?highlight=filte>
http://learn.astropy.org/rst-tutorials/quantities.html?highlight=filte

> rtutorials

> 

> These lines are to setup matplotlib:

> 

> import matplotlib.pyplot as plt

> 

> %matplotlib inline

> 

> Spyder will not accept the second (i.e. %matplotlib inline) because, 

> according to a Stack Overflow answer 'Line magics are only supported 

> by the IPython command line. They cannot be used inside a script, 

> because %something is not correct Python syntax'.

> 

> Suggestion is to use

> 

> exec(%matplotlib inline)

> 

> This is accepted by the Python interpreter but doesn't work, i.e. the 

> subsequent code

> 

> plt.figure()

> 

> plt.hist(v, bins='auto', histtype="step")

> 

> plt.ylabel("N")

> 

> ? does not produce the histogram expected.  The variable v is 

> calculated earlier in the code.

> 

> 

> 

> All the rest of the code works exactly as expected.  I've added input 

> statements to vary Reff and vmean in order to observe the effect of 

> varying these parameters and the results from the code check out 

> against results using a calculator.

> 

> I?m using Spyder 3 on Windows 10, fully patched.

> 

> Does anyone know of a way around this histogram problem?

> 

> Best regards

> 

> Gordon Dennis

> 

> 

> 

> 

> 

> +44(0)1934 838096 / +44(0)7774628110 / Skype: gordon.dennis

> 

> Sent from my Analytical Engine

> 

> [image: Description: analyticalEngine]

> 

> 

> _______________________________________________

> AstroPy mailing list

>  <mailto:AstroPy at python.org> AstroPy at python.org

>  <https://mail.python.org/mailman/listinfo/astropy>
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------------------------------

Message: 2

Date: Tue, 27 Aug 2019 15:10:28 +0100

From: David Stansby <dstansby at gmail.com>

To: Astronomical Python mailing list <astropy at python.org>

Subject: Re: [AstroPy] Histogram problem in astropy tutorial

Message-ID:

<CAGm9cHCnAc0hvrBLr-3OAxri7wvRzUo5ZfhzwVwL3wukf3tjeg at mail.gmail.com>

Content-Type: text/plain; charset="utf-8"

Hi Gordon,

If you're using Matplotlib in a normal python session then you don't need
the '%matplotlib inline' command, but you will need to append 'plt.show()`
to the end of your script to make the figure show up.

Cheers,

David

On Tue, 27 Aug 2019 at 13:13, Gordon Dennis <
<mailto:gordon.b.dennis at gmail.com> gordon.b.dennis at gmail.com>

wrote:

> Hi everybody

> 

> I'm having some difficulty with the example 'Galaxy mass' in the 

> tutorial at 

>  <http://learn.astropy.org/rst-tutorials/quantities.html?highlight=filte>
http://learn.astropy.org/rst-tutorials/quantities.html?highlight=filte

> rtutorials

> 

> These lines are to setup matplotlib:

> 

> import matplotlib.pyplot as plt

> 

> %matplotlib inline

> 

> Spyder will not accept the second (i.e. %matplotlib inline) because, 

> according to a Stack Overflow answer 'Line magics are only supported 

> by the IPython command line. They cannot be used inside a script, 

> because %something is not correct Python syntax'.

> 

> Suggestion is to use

> 

> exec(%matplotlib inline)

> 

> This is accepted by the Python interpreter but doesn't work, i.e. the 

> subsequent code

> 

> plt.figure()

> 

> plt.hist(v, bins='auto', histtype="step")

> 

> plt.ylabel("N")

> 

> ? does not produce the histogram expected.  The variable v is 

> calculated earlier in the code.

> 

> 

> 

> All the rest of the code works exactly as expected.  I've added input 

> statements to vary Reff and vmean in order to observe the effect of 

> varying these parameters and the results from the code check out 

> against results using a calculator.

> 

> I?m using Spyder 3 on Windows 10, fully patched.

> 

> Does anyone know of a way around this histogram problem?

> 

> Best regards

> 

> Gordon Dennis

> 

> 

> 

> 

> 

> +44(0)1934 838096 / +44(0)7774628110 / Skype: gordon.dennis

> 

> Sent from my Analytical Engine

> 

> [image: Description: analyticalEngine]

> 

> 

> _______________________________________________

> AstroPy mailing list

>  <mailto:AstroPy at python.org> AstroPy at python.org

>  <https://mail.python.org/mailman/listinfo/astropy>
https://mail.python.org/mailman/listinfo/astropy

> 

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