Matplotlib for Python Developers by Sandro Tosi

By Sandro Tosi

This booklet is ready Matplotlib, a Python package deal for 2nd plotting that generates creation caliber graphs. Its number of output codecs, numerous chart varieties, and power to run both interactively (from Python or IPython consoles) and non-interactively (useful, for instance, whilst incorporated into net applications), makes Matplotlib appropriate to be used in lots of varied occasions.

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When a mode is enabled, its name appears in the bottom-right part of the window (together with the mouse pointer position on the figure). There are even a series of keyboard shortcuts to enable these functions. They are: Keyboard shortcut Command h or r or home c or left arrow or backspace v or right arrow p o s f hold x hold y hold ctrl g l Home or Reset Back Forward Pan or Zoom Zoom-to-rectangle Save Toggle fullscreen Constrain pan or zoom to x-axis Constrain pan or zoom to y-axis Preserve aspect ratio Toggle grid Toggle y-axis scale (log or linear) IPython support We have already used IPython throughout the chapter, and we saw how useful it is.

When an image is displayed on the screen, the length units are ignored, and simply the pixels are displayed. When printed (or used in a document), the size and DPI are used to determine how to scale the image. The image sizes are expressed in inches, while all other properties are expressed in points such as line width, or font size. We can set the DPI value when saving by passing the additional keyword argument dpi to savefig(). png: PNG image, 1600 x 1200, 8-bit/color RGBA, non-interlaced This file is double the size of the first one (since we've doubled the DPI).

Click on this button to enable it, and move the mouse into the figure area. The two views are described as follows: • Pan: Click on the left mouse button and hold it to pan the figure, dragging it to a new position. Once we're happy with the position, release the mouse button. While panning, if we press (or hold) the x or y key, then the panning is limited to the selected axis. • Zoom: Click on the right mouse button and hold it to zoom the figure, dragging it to a new position. Movement to the right or to the left generates a proportional zoom in or out of the X-axis of the figure.

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