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Is there a name associated to rectangular matrices $M \times N$ that have exactly one entry equal to $1$ in each row and $0$ everywhere else?

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    Are they in different columns, too?2011-03-04
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    @Arturo: no, $N$ can be smaller than $M$. If they were in different columns, it would be just a stochastic matrix, right?2011-03-04
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    I don't think they have any special name; if you had, say, a single column of $1$s, it would be a very different kind of matrix as one in which the $1$s are more evenly distributed. Of course, it's a "sparse" matrix, but that's much more general.2011-03-04
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    @Arturo. thanks anyway.2011-03-04

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