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Fixed non-conformable matrix bug in online_iNMF#269

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bnovotny wants to merge 1 commit intowelch-lab:masterfrom
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Fixed non-conformable matrix bug in online_iNMF#269
bnovotny wants to merge 1 commit intowelch-lab:masterfrom
bnovotny:master

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@bnovotny
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Hi, I noticed that when running online_iNMF I was getting a non-conformable matrix error with regard to object@B[[i]] - B_old[[i]]. I think this is due to the line initializing B_old when X_new is specified; the dimensions of the matrix are different than when X_new is left NULL. Changing the matrix dimensions to (num_genes, k) seems to fix the error. Thanks so much for this package!

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