Is there a sparse version of dummyvar?

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Viktor Witkovsky
Viktor Witkovsky 2014 年 1 月 6 日
I need to generate large sparse matrix from nominal variable, say x,
X = dummyvar(x)
The output X is a large dense matrix of zeros and ones. Is there a version of dummyvar which produse as an outpu a sparse matrix X?

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