My use case is simple, i have performed some kind of operation on image and the resulting feature vector is a numpy object of shape rowX1000(what i mean to say is that the row number can be variable but column number is always 1000)
I can use the following code to generate three dimensional array.
I have a list of values representing radius (r) and another representing angles (theta). I am trying to make a polar plot with North as 0 deg, East as 90 deg and so on.
I have to make a stream cipher that takes in input a byte generator (
randint function by default). I tried to implement it in this way but I don’t want to have at the output the
str() representation, I want the bytes one, so
I’m trying to create an 2d numpy array in shape n x k where n is the dimension of the ndarray given and k is the amount of elements from the ndarray that are integers. Each row in the returned array should contain the indexes at which the condition holds at the relevant dimension.
For example, the ndarray is:
I’m a beginner in Pandas. I have a data file containing 10000 different information of users. This data contain 5 columns and 10000 rows. One of these columns is the district of the users and it divides users according to their living place(It defines just 7 different locations and in each of locations some number of users live). as an example, out of this 10000 users, 300 users live in USA and 250 Live in Canada and..
I want to define a DataFrame which includes five random rows of users with the distinct of: USA,Canada,LA,NY and Japan. Also, the dimensions needs to be 20*5. Can you please help me how to do that?
I know for choosing random I need to use
In the below dataframe the column “CumRetperTrade” is a column which consists of a few vertical vectors (=sequences of numbers) separated by zeros. (= these vectors correspond to non-zero elements of column “Portfolio”). I would like to find the cumulative local maxima of every non-zero vector contained in column “CumRetperTrade”.
To be precise, I would like to transform (using vectorization – or other – methods) column “CumRetperTrade” to the column “PeakCumRet” (desired result) which gives for every vector ( = subset corresponding to ’Portfolio =1 ’) contained in column “CumRetperTrade” the cumulative maximum value of (all its previous) values. The numeric example is below. Thanks in advance!
PS In other words, I guess that we need to use cummax() but to apply it only to the consequent (where ‘Portfolio’ = 1) subsets of ‘CumRetperTrade’
I can’t quite seem to figue out how to get my curve to be displayed smoothly instead of having so many sharp turns.
I am hoping to show a boltzmann probability distribution. With a nice smooth curve.
Context I am trying to load multiple .npy files containing 2D arrays into one big 2D array to process it by chunk later.All of this data is bigger than my RAM so I am using the memmap storage/loading system here: pattern = os.path.join(FROM_DIR, '*.npy') paths = sorted(glob.glob(pattern)) arrays = [np.load(path, mmap_mode='r') for path in paths] … Read more
Suppose I have this dictionary: