np.where(nums == 0)[0]: The np.where() function returns a tuple, but we are only interested in the first element of that tuple (the array of indices). To extract the first element, we use the index [0]. Store the array of indices to the variable 'result'. print(result): Print...
a = np.array([1, 3, 7, 9, 10, 13, 14, 17, 29]): It creates a 1-dimensional NumPy array a with the given elements. np.logical_and(a>=7, a<=20): This line of code creates a boolean array of the same shape as a. It applies two element-wise conditions, checking whether e...
1deffirst_and_last_index_fast(li, lower_limit, upper_limit):2result =[]3iftype(li) !=np.ndarray:4li =np.array(li)5#找到满足条件的索引6index1 = np.where(np.logical_and(li >= lower_limit, li<=upper_limit))[0]7ifindex1.__len__() !=0:8#找到index1差值等于1的索引9index2 =...
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group= array([[1.0,1.1],[1.0,1.0],[0,0],[0,0.1]]) labels= ['A','A','B','B']returngroup, labelsdeffile2matrix(filename): fr=open(filename) numberOfLines= len(fr.readlines())#get the number of lines in the filereturnMat = zeros((numberOfLines,3))#prepare matrix to returnclas...
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common name (this is taken as the gene label in the plot), description and speciesThe final element, separated by [] contains a classification. This information is used by SeqFindr to draw different coloured blocks.An example:>70-tem8674, bla-TEM, Beta-lactams Antibiotic resistance (ampicilli...
a=np.array([7,8,9,5,2,1,5,6,1])print(np.where(a==1)[0][0]) Output: 5 Use thenonzero()Function to Find the First Index of an Element in a NumPy Array Thenonzero()function returns the indices of all the non-zero elements in a numpy array. It returns tuples of multiple ...
Python code to find index where elements change value NumPy# Import numpy import numpy as np # Creating a numpy array arr = [1, 1, 1, 1, 1, 2, 2, 2, 3, 4, 3, 4, 3, 4, 3, 4, 5, 5, 5] # Display original array print("Original Array:\n",arr,"\n") # Finding the ...
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