I have a 2-dimensional numpy array of following format: now how to print the frequency of unique elements in this 2d numpy array, so that it returns count([1. 0.]) = 1 and count([0. 1.]) = 1? I know how to do this using loops, but is there any better pythonic way to do this. Answer You can use numpy.unique(),…
Tag: numpy
Variable is not divisible by an unspecific set of Numbers
I just started to code and try to build my first function in Python/NumPy. My first goal was to get a list for all multiplies of 31 which are not divisible by numbers 1>31 and I figured it out Here is the code: The next step is to make the function more flexible, but easy ideas like this just don’t
Appending/Inserting Multi-Dimension arrays into each other with Numpy
I currently have two 3-D arrays that I want to combine together to make a 4-D array and looking for the most efficient way I want to combine them so they have the shape (12,220,81,1000) so that the x1 is repeated 1000 times appending each element of the second array onto the end of the first array. I’ve…
My project is working on google colab but not working on pycharm
My project is a handwriting digit analyzer. It is working on Google Colab but is showing an error on Pycharm. The statement that is making it work in colab is “%matplotlib inline” this line is showing an error in pycharm. Traceback (most recent call last): File “C:UsersAsusPycharmProjectspyt…
Create forth column based on other columns (lagged) values
I would like to create a forth column “D” which will take a value of 1 if: (at least) two column (A, B, C) have a value of 1 or the previous 2 periods had at least two columns with a value of 1. According to the example above all the rows would have df[‘D’]==1 Answer We can look for
How to efficiently create multidimensional arrays?
assuming I have any function such as f(x, y, z) = xyz what’s the fastest way of calculating every value for f given three linear input arrays x, y, and z? Of course I can do something along the lines of, but this is probably not the best way to do it, especially if the input arrays become larger. Is
Supplying varying number of input arguments for np.meshgrid
I have a function that uses np.meshgrid to get the matrix form of supplied co-ordinates. I have a parameter dim that determines what dimension I am working with and needs to return an array with dim dimension along axis 1. I have attached an MWE below. However my expected output is , which is obtained by repl…
Getting a single array containing several sub-arrays iteratively
I have a little question about python Numpy. What I want to do is the following: having two numpy arrays arr1 = [1,2,3] and arr2 = [3,4,5] I would like to obtain a new array arr3 = [[1,2,3],[3,4,5]], but in an iterative way. For a single instance, this is just obtained by typing arr3 = np.array([arr1,arr2]). …
Way to create numpy array to contain only unique elements for lists within it
I have a numpy array A which looks like this: I want to convert this to an array in which each list contains only unique elements. For example, I want the above array to get converted to: I have tried doing this: The output which I get doing this is not desired and currently looks like this: What can be
AttributeError: ‘dict’ object has no attribute ‘data’
An error occurred while executing the KNN algorithm. I don’t know where the error occurred. Can anyone help me? Please. There is a code below. I don’t know why, but the code was cut. Answer One line defines: That’s a dict comprehension statement In the next loop you have It’s that use …