draw 2 lines in one window

double ExtMapBuffer1[];
double ExtMapBuffer2[];

int init()
{
//---- indicators
SetIndexStyle(0,DRAW_LINE);
SetIndexBuffer(0,ExtMapBuffer1);
string short_name = "Typical price is running!";
IndicatorShortName(short_name);
SetIndexBuffer(0,ExtMapBuffer2);
//----
return(1);
}

int deinit()
{
return(0);
}

int start()
{
int counted_bars=IndicatorCounted();
//---- check for possible errors
if (counted_bars<0) return(-1);
//---- last counted bar will be recounted
if (counted_bars>0) counted_bars--;
int pos=Bars-counted_bars;
double x,plow,phigh,tprice;
Comment("Hi! I'm here on the main chart windows!");
//---- main calculation loop
while(pos>0)
{
x = (iOpen(NULL,NULL,pos) + iHigh(NULL,NULL,pos) + iLow(NULL,NULL,pos) + 2.0*iClose(NULL,NULL,pos))/5.0;
plow=2.0*x-iHigh(NULL,NULL,pos);
phigh=2.0*x-iLow(NULL,NULL,pos);
tprice=(plow+phigh)/2.0;
ExtMapBuffer1[pos-1]= tprice;
ExtMapBuffer2[pos-1]= plow;
pos--;
}
//----
return(0);
}

Quoting magnumfreak

Disliked

Not sure if you included the whole file or not but you need to declare the number of buffers you are going to use. Typically this is found near the top of the file and will look like:

#property indicator_buffers 2

Ignored