addSMA not drawn on graph when called from function

Question

I am a newbie for R and have got stuck here. I am trying to draw a graph with price, sma and ema.

When I call the graph from the command line it draws fine includin

Answer 1

wrap plot around your add* calls.

plot(addSMA(10))
plot(addEMA(10))

I think you could also just add these in the lineChart call instead. (untested)

lineChart(ydat.monthly["1998/"], TA="addSMA(10);addEMA(10)", name=paste(tickers[x],"Monthly & 10 Month Moving Average"))