create_2d_dataset: Create 2D dataset
In specmine: Metabolomics and Spectral Data Analysis and Mining

Creates a 2D dataset from existing objects.

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create_2d_dataset(list_2d, type = "undefined", metadata = NULL, description = "", 
                  sample.names = NULL, F1 = NULL, F2 = NULL, label.x = NULL,
                  label.y = NULL, label.values = NULL)

`list_2d`	A list of matrices where each matrix represents a 2D spectra from one sample.
`type`	Type of data: string that can be one of the following: 2d-nmr
`metadata`	Data frame with the dataset's metadata: columns represent each metadata variable and rows represent the value of the metadata for the sample.
`description`	String with a short description of the dataset.
`sample.names`	Vector with sample names, if NULL then the names of the 2D list or sequential numbers will be used.
`F1`	Vector of the indirect dimension' ppm values.
`F2`	Vector of the diret dimension' ppm values.
`label.x`	Label for the x axis.
`label.y`	Label for the y axis.
`label.values`	Label for the variable represented by a pair (x,y).

List representing the 2D dataset:

`data`	A list of matrices where each matrix matches one 2D spectra.
`type`	The type of the data in the dataset.
`description`	A short text describing the dataset.
`metadata`	A dataframe with the metadata variables.
`F1_ppm`	The ppm values regarding indirect dimension.
`F2_ppm`	The ppm values regarding direct dimension.
`labels`	A list of labels for the x, y and pairs'(x,y) values.