dataFormat: dataFormat Function
In nsantantonio/Bilinear: Fits bilinear models for multi environment trial data

This function is made to format data within bilinear(). Not intended for use by user.

1	dataFormat(x, G, E, y, block, alpha, anyNullGEy, override3col)

`x`	matrix or data.frame containing numeric values of cell means with genotypes on rows and environments on columns (e.g. ith genotype within jth environment). Alternatively a data.frame can be provided in long format, with factor and value variable names passed to 'G', 'E' and 'y' respectively
`G`	character. Name of genotype variable in data.frame 'x' if 'x' is a data.frame in long format. Optionally, character or factor vector of genotype names (optional). If NULL (default) a matrix of cell means must be provided to 'x' argument
`E`	character. Name of environment variable in data.frame 'x' if 'x' is a data.frame in long format. Optionally, character or factor vector of environment names (optional). If NULL (default) a matrix of cell means must be provided to 'x' argument
`y`	character. Name of phenotype variable in data.frame 'x' if 'x' is a data.frame in long format. Optionally, numeric vector of phenotype values (optional). If NULL (default) a matrix of cell means must be provided to 'x' argument
`block`	character. Optional, for RCBD only. Name of block variable in data.frame 'x' if 'x' is a data.frame in long format and study is an RCBD. Optionally, character or factor vector of block names.
`alpha`	pvalue cutoff threshold for significance. Default is 0.05.
`anyNullGEy`	logical. Are any of 'G', 'E', 'y' arguments NULL?
`override3col`	logical. Overrides the 3 column numeric warning when a matrix of 3 coulmns is provided. Most users will not need to turn this off, unless the number of environments is 3 and a table of cell means are provided. Default is FALSE.