I have a scatter plot graph with a bunch of random x, y coordinates. Currently the Y-Axis starts at 0 and goes up to the max value. I would like the Y-Axis to start at the max value and go up to 0.
points = [(10,5), (5,11), (24,13), (7,8)]
x_arr = []
y_arr = []
for x,y in points:
x_arr.append(x)
y_arr.append(y)
plt.scatter(x_arr,y_arr)
This question is related to
python
matplotlib
Another similar method to those described above is to use plt.ylim
for example:
plt.ylim(max(y_array), min(y_array))
This method works for me when I'm attempting to compound multiple datasets on Y1 and/or Y2
DisplacedAussie's answer is correct, but usually a shorter method is just to reverse the single axis in question:
plt.scatter(x_arr, y_arr)
ax = plt.gca()
ax.set_ylim(ax.get_ylim()[::-1])
where the gca()
function returns the current Axes instance and the [::-1]
reverses the list.
Alternatively, you can use the matplotlib.pyplot.axis() function, which allows you inverting any of the plot axis
ax = matplotlib.pyplot.axis()
matplotlib.pyplot.axis((ax[0],ax[1],ax[3],ax[2]))
Or if you prefer to only reverse the X-axis, then
matplotlib.pyplot.axis((ax[1],ax[0],ax[2],ax[3]))
Indeed, you can invert both axis:
matplotlib.pyplot.axis((ax[1],ax[0],ax[3],ax[2]))
If you're in ipython in pylab
mode, then
plt.gca().invert_yaxis()
show()
the show()
is required to make it update the current figure.
axis([xmin, xmax, ymin, ymax])
So you could add something like this at the end:
plt.axis([min(x_arr), max(x_arr), max(y_arr), 0])
Although you might want padding at each end so that the extreme points don't sit on the border.
If using matplotlib you can try:
matplotlib.pyplot.xlim(l, r)
matplotlib.pyplot.ylim(b, t)
These two lines set the limits of the x and y axes respectively. For the x axis, the first argument l sets the left most value, and the second argument r sets the right most value. For the y axis, the first argument b sets the bottom most value, and the second argument t sets the top most value.
You could also use function exposed by the axes object of the scatter plot
scatter = plt.scatter(x, y)
ax = scatter.axes
ax.invert_xaxis()
ax.invert_yaxis()
Source: Stackoverflow.com