Hi Oleg, I haven’t gone carefully over your code but I suspect it has to do with mixing row/column coordinates with x/y (cartesian) coordinates. See this document for a brief explanation in the context of images: http://scikit-image.org/docs/dev/user_guide/numpy_images.html#coordinate-con... So you probably have to mess with x2 and y2 somewhere to transpose them. Probably in the call to meshgrid, where NumPy would expect row/column and you are providing x/y. Juan. On 23 Mar 2018, 12:26 PM -0400, O.Zolotov <zolotovo@gmail.com>, wrote:

Dear All,

I try to ‘plot’ data from mat-file. The matlab file’s URL is https://agupubs.onlinelibrary.wiley.com/action/downloadSupplement?doi=10.1002%2F2016JA023579&attachmentId=2190682395

(~80Mb!)

When I plot the figure, it looks rotated over the original one. Is there a way to fix this? I tested it using SciLab also, and it produced the figure as expected, so the problem is unlikely in the file itself. I use the following commands to plot the figure

import scipy.io as s import numpy as np

ds2 = s.loadmat(r"jgra53413-sup-0003-DataSetS2.mat") jx2, jy2, jz2 = ds2['jx'], ds2['jy'], ds2['jz'] x2, y2, z2 = ds2['x'][0], ds2['y'][0], ds2['z'][0] X2, Y2 = np.meshgrid(x2,y2)

import matplotlib.pyplot as plt plt.subplot(2,2,1) plt.pcolor(X2, Y2, jz2[:,:,0]) plt.colorbar() plt.show()

The original and plotted images are attached.

Regards, Oleg

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