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    <p>If you're dealing with a regular grid, just treat it as an image:</p> <pre><code>import numpy as np import matplotlib.pyplot as plt nrows, ncols = 1000, 1000 z = 500 * np.random.random(nrows * ncols).reshape((nrows, ncols)) plt.imshow(z, interpolation='nearest') plt.colorbar() plt.show() </code></pre> <p><img src="https://i.stack.imgur.com/dQwwh.png" alt="enter image description here"></p> <p>If you have randomly ordered x,y,z triplets that make up a regular grid, then you'll need to grid them. </p> <p>Essentially, you might have something like this:</p> <pre><code>import numpy as np import matplotlib.pyplot as plt # Generate some data nrows, ncols = 1000, 1000 xmin, xmax = -32.4, 42.0 ymin, ymax = 78.9, 101.3 dx = (xmax - xmin) / (ncols - 1) dy = (ymax - ymin) / (ncols - 1) x = np.linspace(xmin, xmax, ncols) y = np.linspace(ymin, ymax, nrows) x, y = np.meshgrid(x, y) z = np.hypot(x - x.mean(), y - y.mean()) x, y, z = [item.flatten() for item in (x,y,z)] # Scramble the order of the points so that we can't just simply reshape z indicies = np.arange(x.size) np.random.shuffle(indicies) x, y, z = [item[indicies] for item in (x, y, z)] # Up until now we've just been generating data... # Now, x, y, and z probably represent something like you have. # We need to make a regular grid out of our shuffled x, y, z indicies. # To do this, we have to know the cellsize (dx &amp; dy) that the grid is on and # the number of rows and columns in the grid. # First we convert our x and y positions to indicies... idx = np.round((x - x.min()) / dx).astype(np.int) idy = np.round((y - y.min()) / dy).astype(np.int) # Then we make an empty 2D grid... grid = np.zeros((nrows, ncols), dtype=np.float) # Then we fill the grid with our values: grid[idy, idx] = z # And now we plot it: plt.imshow(grid, interpolation='nearest', extent=(x.min(), x.max(), y.max(), y.min())) plt.colorbar() plt.show() </code></pre> <p><img src="https://i.stack.imgur.com/gl1oh.png" alt="enter image description here"></p>
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    1. USJoe Kington
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    1. COgreat! you are the master!
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    2. COIndeed he is :-)
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      1. USIvo Flipse
 

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