converting to a matrix

2014 4 2
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更新时间：2021 8 20
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I have a tab separated text file with columns user_iD movie_Id ratings time. I want to create a matrix where the (i,j) entry is rating by user i for the movie j. there are 100,000 ratings from 1000 users on 1700 movies.
196 242 3 881250949
186 302 3 891717742
22 377 1 878887116
244 51 2 880606923
166 346 1 886397596

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Niklas Nylén
Niklas Nylén 2014-4-2

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data = importdata('file.txt')

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R yan
R yan 2014-4-3
thank you. that creates a matrix with the same format as given in the file. how to create a matrix where the (i,j) entry is rating by user i for the movie j.

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R yan
R yan
2014-4-2

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