With the following code:
import matplotlib matplotlib.style.use('ggplot') import matplotlib.pyplot as plt import pandas as pd df = pd.DataFrame({ 'celltype':["foo","bar","qux","woz"], 's1':[5,9,1,7], 's2':[12,90,13,87]}) df = df[["celltype","s1","s2"]] df.set_index(["celltype"],inplace=True) df.plot(kind='bar',alpha=0.75) plt.xlabel("") I made this plot:
How can I rotate the x-axis tick labels to 0 degrees?
I tried adding this but did not work:
plt.set_xticklabels(df.index,rotation=90) Pass param rot=0 to rotate the xticklabels:
import matplotlib matplotlib.style.use('ggplot') import matplotlib.pyplot as plt import pandas as pd df = pd.DataFrame({ 'celltype':["foo","bar","qux","woz"], 's1':[5,9,1,7], 's2':[12,90,13,87]}) df = df[["celltype","s1","s2"]] df.set_index(["celltype"],inplace=True) df.plot(kind='bar',alpha=0.75, rot=0) plt.xlabel("") plt.show() yields plot:
Try this -
plt.xticks(rotation=90) 
plt.show() now the labels are cut off due to the long date labels.
plt.tight_layout() before doing plt.show()You can use set_xticklabels()
ax.set_xticklabels(df['Names'], rotation=90, ha='right') 
The question is clear but the title is not as precise as it could be. My answer is for those who came looking to change the axis label, as opposed to the tick labels, which is what the accepted answer is about. (The title has now been corrected).
for ax in plt.gcf().axes: plt.sca(ax) plt.xlabel(ax.get_xlabel(), rotation=90) The follows might be helpful:
# Valid font size are xx-small, x-small, small, medium, large, x-large, xx-large, larger, smaller, None plt.xticks( rotation=45, horizontalalignment='right', fontweight='light', fontsize='medium', ) Here is the function xticks[reference] with example and API
def xticks(ticks=None, labels=None, **kwargs): """ Get or set the current tick locations and labels of the x-axis. Call signatures:: locs, labels = xticks() # Get locations and labels xticks(ticks, [labels], **kwargs) # Set locations and labels Parameters ---------- ticks : array_like A list of positions at which ticks should be placed. You can pass an empty list to disable xticks. labels : array_like, optional A list of explicit labels to place at the given *locs*. **kwargs :class:`.Text` properties can be used to control the appearance of the labels. Returns ------- locs An array of label locations. labels A list of `.Text` objects. Notes ----- Calling this function with no arguments (e.g. ``xticks()``) is the pyplot equivalent of calling `~.Axes.get_xticks` and `~.Axes.get_xticklabels` on the current axes. Calling this function with arguments is the pyplot equivalent of calling `~.Axes.set_xticks` and `~.Axes.set_xticklabels` on the current axes. Examples -------- Get the current locations and labels: >>> locs, labels = xticks() Set label locations: >>> xticks(np.arange(0, 1, step=0.2)) Set text labels: >>> xticks(np.arange(5), ('Tom', 'Dick', 'Harry', 'Sally', 'Sue')) Set text labels and properties: >>> xticks(np.arange(12), calendar.month_name[1:13], rotation=20) Disable xticks: >>> xticks([]) """ 