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Python Articles
Page 121 of 855
How do you get the current figure number in Python's Matplotlib?
In this article, we will learn how to get the current figure number in Python's Matplotlib. This is useful when working with multiple figures and you need to identify which figure is currently active. Matplotlib is a comprehensive plotting library for Python that provides MATLAB-like functionality. When working with multiple plots, each figure gets assigned a unique number that you can retrieve programmatically. Using plt.gcf().number What is plt.gcf()? The matplotlib.pyplot.gcf() function returns the current figure object. If no figure exists, it creates a new one automatically. matplotlib.pyplot.gcf() Example Here's how to ...
Read MoreHow to increase the thickness of error line in a Matplotlib bar chart?
To increase the thickness of error lines in a Matplotlib bar chart, we can use the error_kw parameter with a dictionary containing line width properties. This parameter controls the appearance of error bars including their thickness, cap size, and cap thickness. Basic Bar Chart with Default Error Lines Let's first create a simple bar chart with default error lines ? import matplotlib.pyplot as plt # Sample data labels = ['G1', 'G2', 'G3', 'G4', 'G5'] values = [20, 35, 30, 35, 27] errors = [2, 3, 4, 1, 2] fig, ax = plt.subplots(figsize=(7.5, 3.5)) ...
Read MoreHow to plot a time series array, with confidence intervals displayed in Python? (Matplotlib)
To plot a time series with confidence intervals in Python, we can use Matplotlib's plot() for the main line and fill_between() for the confidence bands. This visualization helps show data uncertainty and trends over time. Step-by-Step Approach Here's how to create a time series plot with confidence intervals ? Create or load your time series data Calculate rolling mean and standard deviation Define upper and lower confidence bounds Plot the mean line using plot() Add confidence intervals using fill_between() Example import numpy as np import pandas as pd import matplotlib.pyplot as plt ...
Read MoreHow to plot a watermark image in Matplotlib?
A watermark is a semi-transparent image overlay that appears on top of your plot. Matplotlib provides the figimage() method to add watermark images directly to figures. Basic Watermark Example Here's how to add a watermark image to a matplotlib plot ? import numpy as np import matplotlib.pyplot as plt from matplotlib import cbook import matplotlib.image as image # Set figure size plt.rcParams["figure.figsize"] = [7.50, 3.50] plt.rcParams["figure.autolayout"] = True # Load sample watermark image with cbook.get_sample_data('logo2.png') as file: watermark = image.imread(file) # Create plot fig, ax = plt.subplots() # ...
Read MoreDifferent X and Y scales in zoomed inset in Matplotlib
To show different X and Y scales in zoomed inset in Matplotlib, we can use the inset_axes() method from mpl_toolkits.axes_grid1.inset_locator. This allows us to create a magnified view of a specific region with custom scaling. Creating a Basic Inset with Different Scales Here's how to create a zoomed inset that focuses on a specific region of your plot ? import matplotlib.pyplot as plt import numpy as np from mpl_toolkits.axes_grid1.inset_locator import mark_inset, inset_axes plt.rcParams["figure.figsize"] = [7.50, 3.50] plt.rcParams["figure.autolayout"] = True # Create data points x = np.linspace(0, 1, 100) y = x ** 2 ...
Read MoreHow to plot y=1/x as a single graph in Python?
To plot the function y=1/x as a single graph in Python, we use matplotlib and numpy libraries. The hyperbola y=1/x has two branches separated by asymptotes at x=0 and y=0. Steps to Plot y=1/x Set the figure size and adjust the padding between and around the subplots Create data points using numpy, excluding x=0 to avoid division by zero Plot x and 1/x data points using plot() method Add labels and legend for better visualization Display the figure using show() method Example Here's how to plot the hyperbola y=1/x with proper handling of the ...
Read MoreHow to change the separation between tick labels and axis labels in Matplotlib?
In Matplotlib, you can control the spacing between tick labels and axis labels using the labelpad parameter. This parameter adjusts the distance between the axis label and the tick labels, giving you precise control over your plot's appearance. Syntax plt.xlabel("label_text", labelpad=distance) plt.ylabel("label_text", labelpad=distance) The labelpad parameter accepts a numeric value representing the distance in points between the axis label and tick labels. Basic Example Here's how to adjust the separation between tick labels and axis labels ? import matplotlib.pyplot as plt # Set figure size plt.figure(figsize=(8, 5)) # Create ...
Read MoreHow to modify the font size in Matplotlib-venn?
To modify the font size in Matplotlib-venn, we can use the set_fontsize() method on the text objects returned by the venn diagram functions. This allows you to customize both set labels and subset labels independently. Installation First, ensure you have the required library installed ? pip install matplotlib-venn Basic Example Here's how to create a 3-set Venn diagram with custom font sizes ? from matplotlib import pyplot as plt from matplotlib_venn import venn3 plt.rcParams["figure.figsize"] = [7.50, 3.50] plt.rcParams["figure.autolayout"] = True set1 = {'a', 'b', 'c', 'd'} set2 = {'a', ...
Read MoreHow to plot a non-square Seaborn jointplot or JointGrid? (Matplotlib)
Seaborn's jointplot() creates square plots by default, but you can create non-square (rectangular) plots by adjusting the figure dimensions using set_figwidth() and set_figheight() methods. Basic Non-Square Jointplot Here's how to create a rectangular jointplot by modifying the figure dimensions ? import seaborn as sns import numpy as np import matplotlib.pyplot as plt import pandas as pd # Generate sample data np.random.seed(42) x_data = np.random.randn(1000) y_data = 0.2 * np.random.randn(1000) + 0.5 # Create DataFrame df = pd.DataFrame({'x': x_data, 'y': y_data}) # Create jointplot jp = sns.jointplot(x="x", y="y", data=df, height=4, ...
Read MoreHow to add a legend on Seaborn facetgrid bar plot using Matplotlib?
Adding a legend to a Seaborn FacetGrid bar plot requires using map_dataframe() with the plotting function and then calling add_legend(). This approach works with various plot types including bar plots, scatter plots, and line plots. Basic FacetGrid with Legend Let's start with a simple example using sample data ? import pandas as pd import seaborn as sns import matplotlib.pyplot as plt # Set figure parameters plt.rcParams["figure.figsize"] = [10, 4] plt.rcParams["figure.autolayout"] = True # Create sample data df = pd.DataFrame({ 'category': ['A', 'B', 'C', 'A', 'B', 'C'], ...
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