constraint_equation: Creates a constraint equation based on the input data frame.
In davidkane9/kmatching: Creates random vectors fulfilling constraints

Description Usage Arguments Value Author(s)

Given an input data frame, extract the matching vectors and the weight vectors out of the data frame. Then format the extracted data to form a linear constraint Aw=b that defines a sample space from which we will later sample from.

1	constraint_equation(x, weight.var, match.var, replace)

`x`	data frame containing needed input data
`weight.var`	character name of the column of the input weights
`match.var`	character vector of names of columns of 'data' we wish to match on
`replace`	logical indicating whether or not observations weighted in the original weight.var are allowed positive weight in the output.