Combining/splitting

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np.concatenate((arr1,arr2),axis=0) Adds arr2 as rows to the end of arr1
np.concatenate((arr1,arr2),axis=1) Adds arr2 as columns to end of arr1
np.split(arr,3) Splits arr into 3 sub-arrays
np.hsplit(arr,5) Splits arr horizontally on the 5th index
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