Reformats a simple edgelist into an edgelist and nodelist formatted correctly for the cognitivemapr package
prepare_lists_from_edgelist.RdThis function is used to derive a nodelist from a simple edgelist as well as reformat the edgelist so it is formatted correctly to be used in the cognitivemapr Rpackage. It takes an edgelist with the following 4 mandatory columns: "from": cause concept "to": effect concept "weight": number of times the relation is mentioned (can have any number, if left empty the function will set it by default to 1) "edge_value": sign/value of the relation: can be 1 (positive relation), -1 (negative relation), or 0 (non-existent relation). If left empty the function will set it by default to 1 (positive) in addition any number of columns with meta-data may be added.
Details
The function replaces the concepts in the edgelist with id's that correspond to those in the returned nodelist. It reorders the columns to match the requirements of the other functions in this package. It checks whether the columns weight and edge-value in the edgelist have values and sets these values to the default of 1 (weight = 1, edge_value = positive)if not. It assumes all the concepts in the edgelist are in principle normatively positive or neutral by adding two columns: value.x (value of concepts in 'from' column) and value.y (value of concepts in 'to' column) and sets all values to 1 (=positive)
It derives a nodelist from the edgelist with all unique concepts and an id to link the edge and nodelists. It adds three columns to the nodelist, a column 'value' which is set to 1 (the concept has a positive or neutral value) by default. This value may be changed (in R or manually in excel) if needed after running this function. It also adds two empty columns named "paradigms" and "instruments", for the researcher to fill in after running the function. Categorizing concepts as paradigmatic or as instruments is optional, but required to run the functions "paradigm_support" and "instrument_support" functions of this package - see more instructions in the documentation of these functions). If the value of the nodes is changed after running this function, you will subsequently need to run the "align_edge_nodelist" function to make sure your edge and nodelist are aligned again (not necessary when only paradigms or instruments are added).
Examples
if (FALSE) {
# INCOMPLETE
# Load the data
data("edgelist")
# Run the following lines of code to save the edge and nodelist
speaker_nodelist <- prepare_lists_from_edgelist(edgelist)[[1]]
speaker_edgelist <- prepare_lists_from_edgelist(edgelist)[[2]]
# You may store the nodelist as csv and fill in the value, paradigms and
# instruments column via excel by running the following code:
write.csv(df,file='/.../new_file.csv',fileEncoding = "UTF-8")
}