[Arrows] Error in arrowDiamond

[discoleo]

Error in arrowDiamond

• the d.head should have 2 values by default: d.head=c(-1, 1);

  arrowDiamond = function(x, y, d=0.2, lwd=1, d.head=c(-1, 1), d.lines=0, h.lwd=lwd, col="red", scale=1, join=0) {

[DarianFlorianVoda]

added