Real-time data

[Wasssssup]

Hello,

I'm looking to create a chart that tells me the price of gold in dollars. I'm
getting the data from the yahoo stock price csv.

I can get two arrays - last trade time and price.

The problem I am having is finding out how this can be continually updated
every 30mins so that I have a 24 hour chart.

Any help would be much appreciated.

This is the code I am using at the moment

SetPlotType('points'); $plot->SetDataType('data-data'); $plot->SetDataValues($datatoplot); $plot->DrawGraph(); ?>

[Alex Doll]

The data you are getting from Yahoo is only one data point. If you want a 24
hour chart, then you either need to request more data from Yahoo or find a way
to cache it. This isn't PHPlot's problem - you need to construct an array with
all 24h worth of data to feed to PHPlot.

Also remember to watch the structure of your $datatoplot array. It should
contain a (blank) label then the two values you want to plot (ergo: "label",
X, Y). The time that Yahoo provides is not a valid ISO time code readable by
PHPlot, so you need to turn that into something more digestible.

[Jon Allport]

Agreed, you will need to cache the values yourself. I'd pull the values into a
mySQL table and then use something like:

SELECT TradeTime, Price FROM gold WHERE  TradeTime>=DATE_SUB(DATE(),INTERVAL 24 HOUR);

to pull the latest 24 hours for any given refresh and give that to PHPlot.