Say I have a pd.DataFrame() that I differenced with .diff(5), which works like “new number at idx i = (number at idx i) – (number at idx i-5)” Now I want to undo this operation using the first 5 entries of example_df, and using df_diff. If i had done .diff(1), I would simply use .cumsum(). But how can I achieve
Tag: diff
How to add multiple columns to a dataframe based on calculations
I have a csv dataset (with > 8m rows) that I load into a dataframe. The csv has columns like: I am able to load the dataset into my dataframe, but then I need to add multiple calculated columns to the dataframe for each row. In otherwords, unlike this SO question, I do not want the rows of the new
Analysing height difference from columns and selecting max difference in Python
I have a .csv file containing x y data from transects (.csv file here). The file can contain a few dozen transects (example only 4). I want to calculate the elevation change from each transect and then select the transect with the highest elevation change. I’ve tried to calculate the change with pandas.dataframe.diff but I’m unable to select the highest
Numpy diff inverted operation?
Working with numpy.diff function, suppose this simple case: How can I get easily x back to original scale not differenced? I suppose there is something with numpy.cumsum(). Answer Concatenate with the first element and then use cumsum – For concatenating, we can also use np.hstack, like so – Or with np.concatenate for the concatenation –
Recursive diff of two dictionaries (keys and values)?
So I have a python dictionary, call it d1, and a version of that dictionary at a later point in time, call it d2. I want to find all the changes between d1 and d2. In other words, everything that was added, removed or changed. The tricky bit is that the values can be ints, strings, lists, or dicts, so
Python difflib: highlighting differences inline?
When comparing similar lines, I want to highlight the differences on the same line: While difflib.HtmlDiff appears to do this sort of inline highlighting, it produces very verbose markup. Unfortunately, I have not been able to find another class/method which does not operate on a line-by-line basis. Am I missing anything? Any pointers would be appreciated! Answer For your simple
Text difference algorithm
I need an algorithm that can compare two text files and highlight their difference and ( even better!) can compute their difference in a meaningful way (like two similar files should have a similarity score higher than two dissimilar files, with the word “similar” defined in the normal terms). It sounds easy to implement, but it’s not. The implementation can