Checks whether the input for selection is given
correctly. If not, a message is prompted which asks to input one of the 2
available selection methods. The available inputs are "F" and "V". "F"
refers to a fixed percentage of 50
percentage, based on the development of the population fitness values.
See also
Other Helper Functions:
get_grids(),
grid_area(),
hexa_area(),
isSpatial(),
permutations(),
readinteger(),
splitAt(),
windata_format()