Ratio of Symbols

[jrmarkinv]

I am trying to create a plot of ratio of Symbol1 price to Symbol2 price so I can compare performance of one equity Vs another.
That part would be simple using input Symbol1 and Symbol 2.

However, I want to be able to have Symbol1 default to current equity being plotted in chart with a selector to change it to another equity (from a preset list of equities) independent of what is being plotted.

I started with the following code:
input Symbol1 = {"QQQ", "IWM", default Getsymbol};
input Symbol2 = "SPY";

def Symbol1Price = close(Symbol1);
def Symbol2Price = close(Symbol2);
plot ratio = Symbol1Price/Symbol2Price;

Default plot is blank. Only when i change Symbol1 selector to QQQ or IWM does it create a plot.

I'd appreciate any help.

 

[halcyonguy]

here are 2 versions

declare lower;

input Symbol1 = {"QQQ", "IWM", default chart};
input Symbol2 = "SPY";
#
def Symbol1Price;
switch(symbol1) {
case QQQ:
  Symbol1Price = close("QQQ");

case IWM:
  Symbol1Price = close("IWM");

case chart:
# chart symbol
  Symbol1Price = close;
}


def Symbol2Price = close(Symbol2);
plot ratio = Symbol1Price/Symbol2Price;

plot z = 0;
input test1 = no;
addchartbubble(test1 , 0,  Symbol1Price + "\n" + Symbol2Price, color.yellow, no);
#

declare lower;

input Symbol1 = {"QQQ", "IWM", default chart};
def symbol1price = if symbol1 == symbol1.chart then close else close(symbol1);
input Symbol2 = "SPY";
def Symbol2Price = close(Symbol2);
plot ratio = Symbol1Price/Symbol2Price;

 

[jrmarkinv]

halcyonguy. Thank you so much. It works. Great help

I did not know using the term chart in the list of symbols would fetch the symbol of the chart.

 

[halcyonguy]

halcyonguy. Thank you so much. It works. Great help

I did not know using the term chart in the list of symbols would fetch the symbol of the chart.

'chart' is just a word in a select-case.
under the case, chart, i set a variable to close, the current price.

case chart:
Symbol1Price = close;