Python saving multiple figures into one PDF file

Python saving multiple figures into one PDF file

You can save multiple Matplotlib figures into a single PDF file in Python using the PdfPages module from the matplotlib.backends.backend_pdf package. Here's how to do it:

import matplotlib.pyplot as plt from matplotlib.backends.backend_pdf import PdfPages # Create some sample figures fig1, ax1 = plt.subplots() ax1.plot([1, 2, 3, 4], [1, 4, 9, 16]) ax1.set_title('Figure 1') fig2, ax2 = plt.subplots() ax2.scatter([1, 2, 3, 4], [1, 2, 3, 4]) ax2.set_title('Figure 2') # Specify the PDF file to save to pdf_file = 'multi_figures.pdf' # Save the figures to the PDF file with PdfPages(pdf_file) as pdf: pdf.savefig(fig1) pdf.savefig(fig2) # Close the figures (optional) plt.close(fig1) plt.close(fig2) print(f'Figures saved to "{pdf_file}"')

In this example:

  1. We create two sample Matplotlib figures (fig1 and fig2) and add some plots to them.

  2. We specify the name of the PDF file where we want to save the figures as pdf_file.

  3. We use the PdfPages context manager to open the PDF file for writing.

  4. Inside the context manager, we use the pdf.savefig() method to save each figure to the PDF file.

  5. Optionally, we can close the figures using plt.close() to free up memory after they are saved.

After running this script, you will have a PDF file (multi_figures.pdf) containing the saved figures. You can add as many figures as you want to the PDF by using pdf.savefig() for each figure within the PdfPages context manager.

Examples

  1. "How to save multiple Matplotlib figures into a single PDF file in Python?"

    • Description: This query covers saving multiple figures created with Matplotlib into a single PDF file.
    • Code:
      import matplotlib.pyplot as plt from matplotlib.backends.backend_pdf import PdfPages # Create figures fig1 = plt.figure() plt.plot([1, 2, 3], [1, 4, 9]) plt.title("Figure 1") fig2 = plt.figure() plt.plot([1, 2, 3], [1, 2, 3]) plt.title("Figure 2") # Save multiple figures into one PDF file with PdfPages("multi_figure.pdf") as pdf: pdf.savefig(fig1) pdf.savefig(fig2)

  2. "How to save multiple plots into one PDF file with Matplotlib in Python?"

    • Description: This query explores saving multiple plots into a single PDF file using Matplotlib.
    • Code:
      import matplotlib.pyplot as plt from matplotlib.backends.backend_pdf import PdfPages # Create multiple plots plt.figure() plt.plot([1, 2, 3], [1, 4, 9]) plt.title("Plot 1") plt.figure() plt.plot([1, 2, 3], [1, 2, 3]) plt.title("Plot 2") # Save plots into a single PDF with PdfPages("multi_plot.pdf") as pdf: for i in plt.get_fignums(): pdf.savefig(plt.figure(i)) # Save each figure

  3. "How to save multiple figures into a single PDF with custom settings in Python?"

    • Description: This query discusses saving multiple figures into a single PDF with custom settings, such as title and metadata.
    • Code:
      import matplotlib.pyplot as plt from matplotlib.backends.backend_pdf import PdfPages # Create figures fig1 = plt.figure() plt.plot([1, 2, 3], [1, 4, 9]) plt.title("Custom Figure 1") fig2 = plt.figure() plt.plot([1, 2, 3], [1, 2, 3]) plt.title("Custom Figure 2") # Save into PDF with custom settings with PdfPages("custom_multi_figure.pdf") as pdf: pdf.infodict().update({ "Title": "Custom PDF", "Author": "Author Name", "Subject": "Matplotlib Figures", "Keywords": "Matplotlib, PDF", "CreationDate": None, }) pdf.savefig(fig1) pdf.savefig(fig2)

  4. "How to save Matplotlib subplots into a single PDF file in Python?"

    • Description: This query explores saving multiple subplots into one PDF file using Matplotlib.
    • Code:
      import matplotlib.pyplot as plt from matplotlib.backends.backend_pdf import PdfPages # Create subplots in a single figure fig, axes = plt.subplots(1, 2) axes[0].plot([1, 2, 3], [1, 4, 9]) axes[0].set_title("Subplot 1") axes[1].plot([1, 2, 3], [1, 2, 3]) axes[1].set_title("Subplot 2") # Save subplots into a single PDF with PdfPages("subplot_multi_figure.pdf") as pdf: pdf.savefig(fig)

  5. "How to save Seaborn figures into one PDF file in Python?"

    • Description: This query discusses saving multiple Seaborn figures into a single PDF file.
    • Code:
      import seaborn as sns import matplotlib.pyplot as plt from matplotlib.backends.backend_pdf import PdfPages # Create Seaborn figures plt.figure() sns.lineplot(x=[1, 2, 3], y=[1, 4, 9]) plt.title("Seaborn Lineplot") plt.figure() sns.scatterplot(x=[1, 2, 3], y=[3, 2, 1]) plt.title("Seaborn Scatterplot") # Save Seaborn figures into a single PDF with PdfPages("seaborn_multi_figure.pdf") as pdf: for i in plt.get_fignums(): pdf.savefig(plt.figure(i))

  6. "How to save multiple figures with different sizes into one PDF file in Python?"

    • Description: This query discusses saving figures of varying sizes into a single PDF file.
    • Code:
      import matplotlib.pyplot as plt from matplotlib.backends.backend_pdf import PdfPages # Create figures with different sizes fig1 = plt.figure(figsize=(8, 6)) plt.plot([1, 2, 3], [1, 4, 9]) plt.title("Figure with size 8x6") fig2 = plt.figure(figsize=(5, 7)) plt.plot([1, 2, 3], [3, 2, 1]) plt.title("Figure with size 5x7") # Save figures with different sizes into one PDF with PdfPages("different_sizes.pdf") as pdf: pdf.savefig(fig1) pdf.savefig(fig2)

  7. "How to save multiple Matplotlib animations into one PDF file in Python?"

    • Description: This query discusses saving Matplotlib animations into a single PDF file, focusing on saving a snapshot from each animation.
    • Code:
      import matplotlib.pyplot as plt import matplotlib.animation as animation from matplotlib.backends.backend_pdf import PdfPages # Create a simple animation fig, ax = plt.subplots() line, = ax.plot([], []) def init(): ax.set_xlim(0, 10) ax.set_ylim(0, 10) return line, def update(frame): line.set_data([frame], [frame]) return line, ani = animation.FuncAnimation(fig, update, init_func=init, frames=range(10), blit=True) # Save a snapshot of the animation into a PDF with PdfPages("animation_snapshot.pdf") as pdf: update(5) # Save a specific frame pdf.savefig(fig)

  8. "How to save multiple figures into one PDF file with specific DPI in Python?"

    • Description: This query explores saving multiple figures into a single PDF file while setting a specific DPI (Dots Per Inch).
    • Code:
      import matplotlib.pyplot as plt from matplotlib.backends.backend_pdf import PdfPages # Create multiple figures fig1 = plt.figure() plt.plot([1, 2, 3], [1, 4, 9]) plt.title("Figure 1") fig2 = plt.figure() plt.plot([1, 2, 3], [1, 2, 3]) plt.title("Figure 2") # Save into PDF with specific DPI with PdfPages("specific_dpi.pdf", dpi=300) as pdf: pdf.savefig(fig1) pdf.savefig(fig2)

  9. "How to save multiple plots into one PDF file with additional text in Python?"

    • Description: This query discusses adding extra text or annotations while saving multiple plots into a single PDF file.
    • Code:
      import matplotlib.pyplot as plt from matplotlib.backends.backend_pdf import PdfPages # Create multiple plots plt.figure() plt.plot([1, 2, 3], [1, 4, 9]) plt.title("Plot 1") plt.figure() plt.plot([1, 2, 3], [1, 2, 3]) plt.title("Plot 2") # Save into PDF with additional text with PdfPages("with_additional_text.pdf") as pdf: pdf.savefig(plt.figure(1)) pdf.text(0.5, 0.5, "Some additional text", transform=plt.gca().transAxes) pdf.savefig(plt.figure(2))

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