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?
Matrix with exactly one 1 in each row
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linear-algebra
matrices
terminology
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2Are they in different columns, too? – 2011-03-04
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0@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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0I 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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0@Arturo. thanks anyway. – 2011-03-04