All Questions
235
questions
3
votes
0
answers
55
views
Python: Iterating through 2 lists
I am trying to implement the following equation:
Where zc is an equally spaced range of values e.g.
t_array = np.arange(z_[0],z_[-1],0.01)
In this case
z_[0] = -15.336
z_[-1] = 15.336
I'm struggling ...
- 41
0
votes
1
answer
73
views
iterate through a csv file using numpy
I have a CSV file with 4 columns with x, y positions for tracks.
The 1st column is the ID of the track. The 2nd column is time. 3rd and 4th are X & Y co-ordinates.
Now the X & Y positions ...
0
votes
0
answers
85
views
Iterating for a specific array element in Python
I'm using in my Python something like this:
for i in range(333333):
array1[i,1]=numpy.where(array1[i,1]!=-1,array[i,1],function(array1[i,0],array1,array2))
Obviously, this is not really ...
- 1
0
votes
1
answer
105
views
How to efficiently standardize data in relation to preceding entries
I am trying to write a python script to standardize a big set of data (>10000 entries) in range of -1 to 1 in relation to preceding entries.
What I'm currently doing is iterating through the set ...
1
vote
0
answers
111
views
What is the best way to iterate over rows of a pandas dataframe whose elements are arrays of different length?
I have a weird dataframe, where each row contains numpy arrays of different length from row to row. Below an example (actual df has more columns and waaaay more rows):
import pandas as pd
import numpy ...
- 5,539
0
votes
0
answers
65
views
how to work with for loop and if in NumPy lib in python
good evening.
i wanted to iterate an array and delete its indexes every other.
or maybe put those indexes i want in a new array.
I tried
Processed_Data=np.array([i for i in Engleashed_Serch_Results if ...
user15819643
0
votes
1
answer
233
views
How to iterate through a dataframe and add values based on previous condition, including the previous value added
I have a 2 columns dataframe. The first column indicates a timestamp. The second column has values calculated (the first few rows have no value on purpose).
df = pd.DataFrame({'timestamp': [123, 456, ...
- 23
0
votes
1
answer
75
views
Use np.nditer as zip
I have tried to apply the function np.nditer() like zip() with arrays of different dimensions, where the iterator should use only the first dimensions.
Minimal example
a_all = np.arange(6).reshape(2,3)...
- 1
-2
votes
1
answer
48
views
How to make calculations and checks on array elements/pixels manually and fast?
To be more clear, I produced a 2-D occupancy map, where obstacles marked with white pixels, from 3-D depth data using Python (NumPy) as given in the following figure.
Occupancy Map
However, ...
- 11
0
votes
1
answer
87
views
How can I easily Iterate NumPy arrays using approaches other than #nditer?
I would like to Iterate each cell value of arrays. I tried it using np.nditer methods (for i in np.nditer(bar_st_1). However, even with 64 GB RAM laptop it tooks alot of computational time and runs ...
3
votes
1
answer
67
views
Delete row if next row has the same first value, python
I have an array that looks like this:
data([0.000, 1], [0.0025, 2], [0.0025, 3], [0.005, 5])
I need to delete [0.0025, 3], because it has the same first value as the one before.
I have tried:
for i in ...
- 55
1
vote
1
answer
37
views
Numpy Array Iteration, starting with third value
I need to iterate through an numpy array, but I need to start with the third value.
My exact problem is the following.
I get an array like this:
data([0.0000, 1], [0.0011, 2], [0.0036, 3], ....)
I ...
- 55
-1
votes
1
answer
31
views
Changing values with conditional and function in pandas/python
I have a dataframe, as per the table below A. I want to create a table with the values of table B.
I would like to compare the next value in the row with the previous value in table A.
If the next ...
- 45
-2
votes
1
answer
341
views
Calculation involving iterations over all combinations of values in two lists in Python [duplicate]
I need to make calculations using two lists each with 36 elements in them. The calculation must use one value in each list using all combinations. Example:
listx = [x1 , x2 , x3 , ... , x36]
listy = [...
0
votes
2
answers
40
views
Iterating over 3D numpy array, creating a copy and set new values
Hello python community,
I am new to python and playing around with numpy arrays and have a question.
E.g. I have this 3D array (in reality the array is much much bigger)
input = np.array([[[0,0,1,1,2,...
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