WebOct 21, 2013 · 9. Just zip the two together and use that as the population: import random random.sample (zip (xs,ys), 1000) The result will be 1000 pairs (2-tuples) of corresponding entries from xs and ys. Update: For Python 3, you need to convert the zipped sequences into a list: random.sample (list (zip (xs,ys)), 1000) Share. WebMay 14, 2012 · If you want to check if two arrays have the same shape AND elements you should use np.array_equal as it is the method recommended in the documentation. Performance-wise don't expect that any equality check will beat another, as there is not much room to optimize comparing two elements. Just for the sake, i still did some tests.
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WebMar 28, 2024 · I have two two-dimensional arrays, and I have to create a new array filtering through the 2nd array where 1st column indexes match. ... Then, we use the result as the boolean index array to select elements in arr2. Share. Improve this answer. Follow edited Mar 28, 2024 at 5:08. answered Mar 28, 2024 at 5:02. ... python; arrays; numpy; … WebFeb 28, 2016 · So you can use this result to set all other elements to zero. import numpy as np a = np.array ( [2.0, 5.1, 6.2, 7.9, 23.0]) # always increasing b = np.array ( [5.1, 5.5, 5.7, 6.2, 00.0]) # also always increasing a [~np.isclose (a,b, atol=0.5)] = 0 a this returns array ( [ 0. , 5.1, 6.2, 0. , 0. ]).
WebGiven two ndarrays old_set = [ [0, 1], [4, 5]] new_set = [ [2, 7], [0, 1]] I'm looking to get the mean of the respective values between the two arrays so that the data ends up something like: end_data = [ [1, 4], [2, 3]] basically it would apply something like for i in len (old_set): end_data [i] = (old_set [i]+new_set [i])/2 WebNote: This page shows you how to use LISTS as ARRAYS, however, to work with arrays in Python you will have to import a library, like the NumPy library. Arrays are used to store multiple values in one single variable: Example Get your own Python Server. Create an array containing car names: cars = ["Ford", "Volvo", "BMW"]
WebSep 15, 2012 · If you want to avoid using for..in, you can sort both arrays first to reindex all their values: Array.prototype.diff = function (arr2) { var ret = []; this.sort (); arr2.sort (); for (var i = 0; i < this.length; i += 1) { if (arr2.indexOf (this [i]) > -1) { ret.push (this [i]); } } return ret; }; Usage would look like: WebMar 1, 2016 · numpy.logical_and allows you to element-wise perform a logical AND operation between two numpy arrays. What we're doing here is determining which locations contain both the x values being 1 and the y values being 4 …
WebNov 2, 2024 · 4 Answers Sorted by: 8 Try this: np.arange (len (a)) [a==b] It creates a new array from 0 to length a representing the indices. Then use a==b to slice the array, returning the indices where a and b are the same. Additionally from @Reblochon-Masque: You can use numpy.where to extract the indices where two values meet a specified condition:
WebDec 1, 2016 · # [Optional] sort locations and drop duplicates id2.sort_values (by='ID2', inplace=True) id2.drop_duplicates ('ID2', inplace=True) # columns that you are merging must have the same name id2.rename (columns= {'ID2':'ID1'}, inplace=True) # perform the merge df = id1.merge (id2) Without drop_duplicates you get one row for each item: harlow meaning and originWebDec 26, 2024 · you could use a dictionary comprehension to get all the repeated numbers and their indexes in one go: L = [1, 2, 3, 4, 5, 3, 8, 9, 9, 8, 9] R = { n:rep [n] for rep in [ {}] for i,n in enumerate (L) if rep.setdefault (n, []).append (i) or len (rep [n])==2 } print (R) {3: [2, 5], 9: [7, 8, 10], 8: [6, 9]} The equivalent using a for loop would be: harlow medispaWebI have two numpy arrays, A and B. A conatains unique values and B is a sub-array of A. ... Get indexes of chosen array elements in the order of these elements from a different array. 0. ... Search indexes where values in my array match a value in a different array (python) 1. Get the indexes of a numpy array inside another numpy array. 20. harlow medical practiceWebSo i have two arrays, they have the same dimension but different lenght. ... I need to get the position and value of the elements that have the same position and are equal in both arrays. In the example case the expected answer will be: Position = 2. Value = Ind3. I'm using python with the numpy module. python; arrays; numpy; compare; Share. Follow chantal pothierWebSep 18, 2015 · I'm using Python 2.7. I have two arrays, A and B. To find the indices of the elements in A that are present in B, I can do. A_inds = np.in1d (A,B) I also want to get the indices of the elements in B that are present in A, i.e. the indices in B of the same overlapping elements I found using the above code. Currently I am running the same … harlow medical building silverdale waWebExample 1: Make a function for both lists. If there are common elements in both the list, then it will return common elements in list c. If both lists do not contain any common elements then it will return an empty list. a=[2,3,4,5] b=[3,5,7,9] def common(a,b): c = [value for value in a if value in b] return c. d=common(a,b) harlow medical building silverdaleWebDec 6, 2010 · Let's say you have two arrays like the following a = array ( [1,2,3,4,5,6]) b = array ( [1,4,5]) Is there a way to compare what elements in a exist in b? For example, c = a == b # Wishful example here print c array ( [1,4,5]) # Or even better array ( [True, False, … harlow medispa hale