plots reference values vs predicted values and additional informations: R2, bias, RMSE, slope and offset
h = regplot(yr,yp,(pointstyle),(trend),(unit),(fig_title))
the reference values and the predicted values respectively; vectors of same dimension or Div structures
the style used to print the points; it contains two characters: the first one isthe color (k,g,r,b,y for black,green,red,blue, yellow) and the second for the symbol chosen among: . * o • ∆ +
default: pointstyle='ko'(black circle)
if trend=='t' then a dashed line representing the trend of the cloud of points is printed; by default: trend==''
a string; the unit of the reference and predicted values
a string; the name of the figure