How to generate a random color for a Matplotlib plot in Python?
How to Generate random line colors in Matplotlib. Import libraries # Import libraries import matplotlib.pyplot as plt import random as random. Define data # define data x = [2, 4, 6, 8, 10] y = [7, 11, 18, 22, 25] We will create three color variables using random.random() function. All three color variables are merged into a tuple.
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Matplotlib recognizes the following formats to specify a color. Color Demo Example matplotlib.colors API List of named colors Example "Red", "Green", and "Blue" are the intensities of those colors. In combination, they represent the colorspace. Transparency #
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matplotlib.pyplot is a state-based interface to matplotlib. It provides an implicit, MATLAB-like, way of plotting. It also opens figures on your screen, and acts as the figure GUI manager. pyplot is mainly intended for interactive plots and simple cases of programmatic plot generation:
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Matplotlib has a number of built-in colormaps accessible via matplotlib.colormaps. There are also external libraries that have many extra colormaps, which can be viewed in the Third-party colormaps section of the Matplotlib documentation. Here we briefly discuss how to choose between the many options.
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You can use the following code to generate the overview yourself xkcd_fig = plot_colortable(mcolors.XKCD_COLORS) xkcd_fig.savefig("XKCD_Colors.png") References The use of the following functions, methods, classes and modules is shown in this example: matplotlib.colors matplotlib.colors.rgb_to_hsv matplotlib.colors.to_rgba
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You can use the following basic syntax to generate random colors in Matplotlib plots: 1. Generate Random Color for Line Plot col = (np.random.random(), np.random.random(), np.random.random()) plt.plot(x, y, c=col) 2. Generate Random Colors for Scatterplot plt.scatter(x, y, c=np.random.rand(len (x),3))
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1 Answer Sorted by: 0 It's not clear why that plot looks the way it does, but what the OP meant to try is now shown as the "wrong way" below. The solution is to stop trying to assign a different color to each marker on a single line, but instead to make a scatter plot which is what this really is!
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4 Answers Sorted by: 34 Choose a color map, such as viridis: cmap = plt.get_cmap ('viridis') The colormap, cmap, is a function which can take an array of values from 0 to 1 and map them to RGBA colors. np.linspace (0, 1, len (names)) produces an array of equally spaced numbers from 0 to 1 of length len (names). Thus,
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You can use the following basic syntax to generate random colors in Matplotlib plots: 1. Generate Random Color for Line Plot col = (np.random.random(), np.random.random(), np.random.random()) plt.plot(x, y, c=col) 2. Generate Random Colors for Scatterplot plt.scatter(x, y, c=np.random.rand(len (x),3))
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Random Color Generator A random color generator or a random color picker in Python is basically a function that generates number of colors by randomly selecting integer values for the red, green, and blue (RGB) channels. It usually returns an actual color or RGB value as a tuple.
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Randomly chosen from what? If you choose randomly from all available colors, you may get a weird mix of some very different colors and some so similar as to be difficult to distinguish. - BrenBarn Feb 6, 2013 at 2:07 1 There are some good answer at java - How to automatically generate N "distinct" colors?
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Create two arrays of data points for the X and Y axes. For this example, we'll use NumPy to generate random data. # Number of data points num_points = 50 # Generate random values for X and Y x_values = np.random.rand (num_points) y_values = np.random.rand (num_points) 3. Create Scatter Plot. Use Matplotlib's scatter () function to create a.
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# A random colormap for matplotlib: cmap = matplotlib.colors.ListedColormap ( numpy.random.rand ( 256,3)) pylab.imshow ( Z, cmap = cmap) pylab.show() Copy link. (might be useful to avoid potentially bad colors from using purely random RGB values): import numpy as np import matplotlib. pyplot as plt vals = np. linspace (0, 1, 256).
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Take an input from the user for the number of colors, i.e., number_of_colors = 20. Use Hexadecimal alphabets to get a color. Create a color from (step 2) by choosing a random character from step 2 data. Plot scatter points for step 1 input data, with step 3 colors. To show the figure, use plt.show () method.
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16 Answers Sorted by: 92 A neat way to generate RGB triplets within the 256 (aka 8-byte) range is color = list (np.random.choice (range (256), size=3)) color is now a list of size 3 with values in the range 0-255. You can save it in a list to record if the color has been generated before or no. Share Improve this answer Follow
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Matplotlib has a number of built-in colormaps accessible via matplotlib.colormaps. There are also external libraries like palettable that have many extra colormaps. However, we may also want to create or manipulate our own colormaps. This can be done using the class ListedColormap or LinearSegmentedColormap .