Generate 4 columns of data such that each row sum to 100

2024/11/16 13:33:43

How do I write a python program that can randomly generate 4 columns of data such that the sum of the numbers of each row is 100?

Answer

>>> import numpy as np
>>> A = np.random.rand(10,4)
>>> A /= A.sum(axis=1)[:,np.newaxis]
>>> A *= 100
>>> Aarray([[ 52.65020485,   8.39068184,   4.89730114,  34.06181217],[ 58.32667159,   8.99338257,  13.7326809 ,  18.94726494],[  8.23847677,  36.27990343,  14.73440883,  40.74721097],[ 37.10408209,   5.31467062,  39.47977538,  18.10147191],[ 21.5697797 ,  14.80630725,  12.69891923,  50.92499382],[ 15.46006657,  24.62499701,  37.37736874,  22.53756768],[  6.66777748,  25.62326117,  11.80042839,  55.90853296],[ 38.81602256,  26.74457165,   3.4365655 ,  31.00284028],[  5.67431732,   7.57571558,  44.01330459,  42.73666251],[ 33.09837171,  26.66421892,  10.90188895,  29.33552043]])

This generates positive real numbers as you asked. They will be random in the uniform distribution. If you want a different distribution, you can find several other choices in np.random.

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