Is there a sparse version of dummyvar?

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Viktor Witkovsky el 6 de En. de 2014

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?

MATLAB Mathematics Sparse Matrices

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