matit: take an estimated basis vector from NMF and format to...
In vjcitn/fatemapper: tools for working with cell fate maps

take an estimated basis vector from NMF and format to template tmpl

1	matit(x, nr = 16, nc = 32, tmpl)

`x`	numerical vector, in the drosmap application, has length 405 representing points in the blastocyst model ellipse
`nr`	number of rows of output matrix
`nc`	number of columns of output matrix
`tmpl`	matrix of nr x nc that has 0 where cells do not exist; in drosmap application, sum(tmpl) == 405

require(NMF)
data(exNmf21)
data(template405)
bas = basis(exNmf21)
mm = matit(bas[,1], tmpl=template405)
contour(t(mm)) # first principal pattern using naive NMF