In my programm I take some data (variable raw) out of a database and have to use it. When using print(raw) this gets displayed: (‘x1 y1 z1 nx2 y2 z2 nx3 y3 z3 nx4 y4 z4’,) (raw has over 450 elements so I shortened it) Now I have to get x1 and y1 and forward them to another module. To
Tag: indexing
Find max by year and return date on which max occurred in Pandas with dates as index
I have this dataframe I would like to compute the max for each year and the date where it happens. I am struggling because I would like to keep indeed the date as index. Indeed I read it as: I know that I could resample as but in this case I would lose the information about the location of the
get first 2 characters of each index in array in python
I am trying to access the first two letters of each index in a numpy array in python: I have read previous forum of the error “‘int’ object is not subscriptable , I know it;s not a string, but for my work it’s better to be numpy.array or if anyone suggest me with another thing, please …
Dask dataframe: Can `set_index` put a single index into multiple partitions?
Empirically it seems that whenever you set_index on a Dask dataframe, Dask will always put rows with equal indexes into a single partition, even if it results in wildly imbalanced partitions. Here is a demonstration: However, I found no guarantee of this behaviour anywhere. I have tried to sift through the co…
How to convert each values in Data Frame to int and float in only one index row in Python Pandas?
I have Pandas Data Frame in Python like below: IDX is and index of this Data Frame. And I would like to add new row in this Data Frame which will calculate mathematic formula like: So for example: (250 – 120) / 250 = 0.52 So as a result I need something like below: because: I used code like below:
Reference DataFrame value corresponding to column header
I am trying to append a column to my DataFrame that is based on the values that are referenced by indicated column names. I have the following DataFrame: The values under “Select” are referencing the values that are under the column number that “Select” shows. For example, for row 0, &…
How to get all last rows at second level in MultiIndex DataFrame whose second level has variable length
I have this dataframe: And I want to keep all the last second level rows, meaning that: For thread_id==0 I want to keep the row message_id_in_thread==1 For thread_id==1 I want to keep the row message_id_in_thread==2 For thread_id==2 I want to keep the row message_id_in_thread==1 This can easily be achieved by…
Find ‘next’ non-null value in column
I am trying to create a new column which appends the row index of next non-null value next to the current non-null value using the following df as a starting point: The output would look like this: I have found a link that touches on the issue but I could not adapt to suit.. How can I get the index
Simplest way to add repeating counter column to pandas dataframe
I have a datafame: What is the shortes / simples way to add a repeating counter column like this?: My feeling tells me, that there must be a one-line solution (maybe a bit longer). But all I can think of would be much longer and complex. How would you approach this? Answer try: OR If you have a custom index
Numpy multiple min indices 3d array [closed]
Closed. This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 1 year ago. Improve this question I have a numpy array of shape (9, 200, 200). I would like to get a list of the indices of the…