Checks whether the input for crossover is given
correctly. If not, a message is prompted which asks to input one of the 2
available crossover methods. The available inputs are "E" and "R". "E"
refers to partitioning at equal intervals and "R" refers to random
partitioning.
See also
Other Helper Functions:
get_grids(),
grid_area(),
hexa_area(),
isSpatial(),
permutations(),
readintegerSel(),
splitAt(),
windata_format()