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Sequentially counting repeated entries

I am currently working on a project where I have to measure someones activity over time on a site, based on whether they edit a site. I have a data frame that looks similar to this: I want to add a column to the dataframe such that it counts the number of repeated values (number of edits, which is column

Why does saving an image with OpenCV result in a black image?

So, I want to create a 500×500 white image using python Numpy library, though I can easily do it in photoshop. The code below is valid and the image is white (because I saved the image using cv2.imsave function and later I opened it with windows photos viewer). But when I try to display it using the cv2.…

cv2.imshow() giving black screen

I’m converting a image (numpy array) into a string. Then I’m converting this string back to a numpy array of the original dimensions. Hence both the numpy arrays are equal- infact numpy.array_equals() also returns True for the arrays being equal. When I call cv2.imshow() on the original numpy arra…

Save Pandas df containing long list as csv file

I am trying to save a pandas dataframe as .csv file. Currently my code looks like this: The saving works but the problem is that the lists in my dataframe are just compressed to [first,second,…,last] and all the entries in the middle are discarded. If I just look at the original dataframe all entries ar…

Automated cross stich pattern

I’m trying to create a cross stitch pattern with python as shown in the attached image. So far I simply have the pixilated image. I could import it in excel and manually add the grid and colors etc. But how can I ‘easily’ automate this in python? Can I use any of the normal figure plotting f…

Interpolate/Resize 3D array

I have a 3D array holding voxels from a mri dataset. The model could be stretched along one or more directions. E.g. the voxel size (x,y,z) could be 0.5×0.5×2 mm. Now I want to resample the 3D array into an array holding 1,1,1 mm voxels. For this I need to make the x/y dimensions smaller and the z d…