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Matplotlib: imshow gives values outside of extent (Bug?)

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.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;

0

With this code you can produce such an image:

import matplotlib.pyplot as plt
import numpy as np

axes = plt.subplot()
axes.set_aspect(1)
axes.format_coord = "x=:1.2f, y=:1.2f".format

pltRange = range(-1, 12)
axes.set_xlim(min(pltRange), max(pltRange))
axes.set_ylim(min(pltRange), max(pltRange))
axes.set_xticks(pltRange)
axes.set_yticks(pltRange)
plt.grid(True)

array = np.random.random((10, 10))
image = axes.imshow(array, extent=[0, 10, 0, 10], origin='lower')
image.format_cursor_data = " | Value: :8f".format

plt.show()

On the bottom right you can see the coordinates of the mouse cursor and the value of the array you are moving over.
This works fine on the coloured tiles. But I also expect to get no value when I move my mouse over the white plates.

On the top and on the right side, this does happen. But not on the bottom and on the left.
If you move your mouse to the position, lets say (-0.5, 2.5), you will still get a value. That makes no sense to me.

Am I doing something wrong or is that a bug? I am using Matplotlib 3.0.3. and Numpy 1.16.2.

Thank you :)

matplotlib coordinates python-3.7 imshow extent

share|improve this question

edited Mar 28 at 17:01

Max16hr

asked Mar 28 at 16:41

Max16hrMax16hr

9411 silver badge99 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Looks like this is fixed in the current development version. There will be a release of matplotlib 3.1 soonish. In any case the observed behaviour is not detrimental, you just see the value of the neighboring pixel when moving the mouse outside and to the left and/or bottom. The values inside are correct.
  
  – ImportanceOfBeingErnest
  Mar 28 at 19:46
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  So it is really a bug :O
  
  – Max16hr
  Mar 28 at 22:51
  

  
  
  
  

add a comment
 | 

0

With this code you can produce such an image:

import matplotlib.pyplot as plt
import numpy as np

axes = plt.subplot()
axes.set_aspect(1)
axes.format_coord = "x=:1.2f, y=:1.2f".format

pltRange = range(-1, 12)
axes.set_xlim(min(pltRange), max(pltRange))
axes.set_ylim(min(pltRange), max(pltRange))
axes.set_xticks(pltRange)
axes.set_yticks(pltRange)
plt.grid(True)

array = np.random.random((10, 10))
image = axes.imshow(array, extent=[0, 10, 0, 10], origin='lower')
image.format_cursor_data = " | Value: :8f".format

plt.show()

On the bottom right you can see the coordinates of the mouse cursor and the value of the array you are moving over.
This works fine on the coloured tiles. But I also expect to get no value when I move my mouse over the white plates.

On the top and on the right side, this does happen. But not on the bottom and on the left.
If you move your mouse to the position, lets say (-0.5, 2.5), you will still get a value. That makes no sense to me.

Am I doing something wrong or is that a bug? I am using Matplotlib 3.0.3. and Numpy 1.16.2.

Thank you :)

matplotlib coordinates python-3.7 imshow extent

share|improve this question

edited Mar 28 at 17:01

Max16hr

asked Mar 28 at 16:41

Max16hrMax16hr

9411 silver badge99 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Looks like this is fixed in the current development version. There will be a release of matplotlib 3.1 soonish. In any case the observed behaviour is not detrimental, you just see the value of the neighboring pixel when moving the mouse outside and to the left and/or bottom. The values inside are correct.
  
  – ImportanceOfBeingErnest
  Mar 28 at 19:46
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  So it is really a bug :O
  
  – Max16hr
  Mar 28 at 22:51
  

  
  
  
  

add a comment
 | 

With this code you can produce such an image:

import matplotlib.pyplot as plt
import numpy as np

axes = plt.subplot()
axes.set_aspect(1)
axes.format_coord = "x=:1.2f, y=:1.2f".format

pltRange = range(-1, 12)
axes.set_xlim(min(pltRange), max(pltRange))
axes.set_ylim(min(pltRange), max(pltRange))
axes.set_xticks(pltRange)
axes.set_yticks(pltRange)
plt.grid(True)

array = np.random.random((10, 10))
image = axes.imshow(array, extent=[0, 10, 0, 10], origin='lower')
image.format_cursor_data = " | Value: :8f".format

plt.show()

On the bottom right you can see the coordinates of the mouse cursor and the value of the array you are moving over.
This works fine on the coloured tiles. But I also expect to get no value when I move my mouse over the white plates.

On the top and on the right side, this does happen. But not on the bottom and on the left.
If you move your mouse to the position, lets say (-0.5, 2.5), you will still get a value. That makes no sense to me.

Am I doing something wrong or is that a bug? I am using Matplotlib 3.0.3. and Numpy 1.16.2.

Thank you :)

matplotlib coordinates python-3.7 imshow extent

share|improve this question

edited Mar 28 at 17:01

Max16hr

asked Mar 28 at 16:41

Max16hrMax16hr

9411 silver badge99 bronze badges

import matplotlib.pyplot as plt
import numpy as np

axes = plt.subplot()
axes.set_aspect(1)
axes.format_coord = "x=:1.2f, y=:1.2f".format

pltRange = range(-1, 12)
axes.set_xlim(min(pltRange), max(pltRange))
axes.set_ylim(min(pltRange), max(pltRange))
axes.set_xticks(pltRange)
axes.set_yticks(pltRange)
plt.grid(True)

array = np.random.random((10, 10))
image = axes.imshow(array, extent=[0, 10, 0, 10], origin='lower')
image.format_cursor_data = " | Value: :8f".format

plt.show()

share|improve this question

edited Mar 28 at 17:01

Max16hr

asked Mar 28 at 16:41

Max16hrMax16hr

9411 silver badge99 bronze badges

share|improve this question

edited Mar 28 at 17:01

Max16hr

asked Mar 28 at 16:41

Max16hrMax16hr

9411 silver badge99 bronze badges

asked Mar 28 at 16:41

Max16hrMax16hr

9411 silver badge99 bronze badges

asked Mar 28 at 16:41

Max16hrMax16hr

9411 silver badge99 bronze badges