Difference between 'data' and 'axes fraction' in matplotlib?
Question:
What does xycoords=('data','axes fraction') mean? I have read
https://matplotlib.org/stable/tutorials/text/annotations.html and it says that 'data' uses the axes data coordinate system, what does this mean?
According to https://matplotlib.org/stable/tutorials/advanced/transforms_tutorial.html 'data' is the coordinate system of the data in the Axes; (0, 0) is bottom left of the axes, and (1, 1) is top right of the axes.
https://matplotlib.org/stable/tutorials/text/annotations.html says 'axes fraction' is (0, 0) is lower left of axes and (1, 1) is upper right. So are 'data' and 'axes fraction' the same thing?
ax.annotate(percent, xy=(x, 0), xycoords=('data','axes fraction'), xytext=(0,-32), textcoords='offset points',va='top' ,ha='center')
Answers:
According to matplotlib’s transforms tutorial, 'data' is the coordinate system of the data in the Axes; (0, 0) is bottom left of the axes, and (1, 1) is top right of the axes.
From what I’m seeing, the 'data' description does not include the second half about (0, 0) and (1, 1). If it’s somewhere on the page that I’ve missed, that’s a mistake and an issue/PR should be filed. That second half should only exist for the 'axes fraction' description.
To clarify by example:
- A
'data' annotation coord of (2, 1) will show up at x=2 and y=1
- An
'axes fraction' annotation coord of (2, 1) will show up at 200% of the x-axis and 100% y
- A
('data', 'axes fraction') annotation coord of (2, 1) will show up at x=2 and 100% y
- A
('axes fraction', 'data') annotation coord of (2, 1) will show up at 200% x and y=1
import matplotlib.pyplot as plt
plt.plot([0, 10], [0, 5])
# at x=2, y=1
plt.annotate('data @ (2, 1)', xy=(2, 1), xycoords='data')
# at 200% x, 100% y
plt.annotate('frac @ (2, 1)', xy=(2, 1), xycoords='axes fraction')
# at x=2, 100% y
plt.annotate('(data, frac) @ (2, 1)', xy=(2, 1), xycoords=('data', 'axes fraction'))
# at 200% x, y=1
plt.annotate('(frac, data) @ (2, 1)', xy=(2, 1), xycoords=('axes fraction', 'data'))
What does xycoords=('data','axes fraction') mean? I have read
https://matplotlib.org/stable/tutorials/text/annotations.html and it says that
'data'uses the axes data coordinate system, what does this mean?
According to https://matplotlib.org/stable/tutorials/advanced/transforms_tutorial.html 'data' is the coordinate system of the data in the Axes; (0, 0) is bottom left of the axes, and (1, 1) is top right of the axes.
https://matplotlib.org/stable/tutorials/text/annotations.html says 'axes fraction' is (0, 0) is lower left of axes and (1, 1) is upper right. So are 'data' and 'axes fraction' the same thing?
ax.annotate(percent, xy=(x, 0), xycoords=('data','axes fraction'), xytext=(0,-32), textcoords='offset points',va='top' ,ha='center')
According to matplotlib’s transforms tutorial,
'data'is the coordinate system of the data in the Axes; (0, 0) is bottom left of the axes, and (1, 1) is top right of the axes.
From what I’m seeing, the 'data' description does not include the second half about (0, 0) and (1, 1). If it’s somewhere on the page that I’ve missed, that’s a mistake and an issue/PR should be filed. That second half should only exist for the 'axes fraction' description.
To clarify by example:
- A
'data'annotation coord of (2, 1) will show up atx=2andy=1 - An
'axes fraction'annotation coord of (2, 1) will show up at 200% of the x-axis and 100% y - A
('data', 'axes fraction')annotation coord of (2, 1) will show up atx=2and 100% y - A
('axes fraction', 'data')annotation coord of (2, 1) will show up at 200% x andy=1
import matplotlib.pyplot as plt
plt.plot([0, 10], [0, 5])
# at x=2, y=1
plt.annotate('data @ (2, 1)', xy=(2, 1), xycoords='data')
# at 200% x, 100% y
plt.annotate('frac @ (2, 1)', xy=(2, 1), xycoords='axes fraction')
# at x=2, 100% y
plt.annotate('(data, frac) @ (2, 1)', xy=(2, 1), xycoords=('data', 'axes fraction'))
# at 200% x, y=1
plt.annotate('(frac, data) @ (2, 1)', xy=(2, 1), xycoords=('axes fraction', 'data'))