I’m currently trying to create a conical gradient, and it kind of works. However, it doesn’t look quite right and I can’t wrap my hand around to why: The line that goes up from the center is slightly angled to the right and at the bottom there is a visible (not too noticable) line. Code is a…
Tag: numpy
Finding elements in list with highest weightage compared to other elements
I have a list of values that add up to 100 (percentage). I need to find the values that constitute the highest percentages as compared to others. How do I decide the criteria for filtering the data? Help me with the logic. Below are a few samples and expected output: The list is already sorted. This is not a …
Pandas average of previous rows fulfilling condition
I have a huge data-frame (>20m rows) with each row containing a timestamp and a numeric variable X. I want to assign a new column where for each row the value in this new column is the average of X in the previous rows within a specified time window e.g the average of all rows with time stamps no more
Lambda and vectorize in python
I’m learning data analysis while performing vectorized operation with lambda function it run at first but again run it shows error as TypeError: <lambda>() takes 1 positional argument but 2 were given sample data of tips.csv file This is the image that I run first which doesn’t show any erro…
Recode multiple values in several columns in Python [similar to R]
I am trying to translate my R script to python. I have a survey data with several date of birth and education level columns for each family member(from family member 1 to member 10): here a sample: I had a function in R in order to check the logic and re code wrong education level in all columns.Like this and
Appending to empty array in a for loop (python)
How do I append values in an empty numpy array? I have an array of values that I want to perform a mathematical equation on and from those values I want to append it to a new empty array. What I have is: However, it isn’t appending and not sure why? Answer You’re missing the array name, you’…
Fitting data to a complementary error function with multiple variables in Python
I am having trouble to fit experimental data to a complementary error function in Python 3.7.4. More precisely, I want to fit my data to the complementary error function consisting of the integrand function with the parameters a, b, c, and the cerf function doing the actual integration. The integration should…
Object tracking program does not show tracked points in the output image
I need to track an object in a video frame but to do so I have to initialize good features to track my object. So, I have a .mp4 file, I retained the blue channel of the first frame and I obtained the first frame. I then went on to create my binary mask by extracting my region of interest
How does NumPy seed its random number generators if no seed is provided?
For example, suppose I call numpy.random.uniform(0, 1, 10) without calling any of the seed-related functions. NumPy must be using some default seed, but I couldn’t find it in the documentation. How does NumPy seed its random numbers when no seed is specified? Answer For NumPy’s legacy numpy.random…
Overwriting an array in Numpy function Python
I am trying to write a numpy function that iterates with itself to update the values of its function. If for example Random_numb was equal to [50, 74, 5, 69, 50]. So the calculations would go like, 10* 50 = 500 for the first calculation, with the equation Starting_val = Starting_val * Random_numb. The Startin…