A very simple function which uses the DataFeed toolbox to retrieve stock prices for a specified number of days from the Yahoo service and plots them.
e.g. to see how your Microsoft shares have done over the last three months, just type:
A trivial wrapper, and nothing that's not in toolbox doc.
fetch function for historic data returns date in a form which is unknown. It is not in the same form as <now>. Try this fetch function
d = fetch(C,'INFOSYSTC.NS','Close',datestr(n),datestr(n-num_days),'d');
Is it something typical to Indian Stock Market?
Added copyright lines and upgraded error handling to use the latest syntax.