Questions about indicator lua programming

[xiupingge]

in function Update(period), could some one tell me how to compare the the candle length with a constant?
I use source.close[period] - source.open[period] in if condition as below:
if source.high[period] - source.low[period] >30 then
...
else
...
it seems not work! always go to else, except only I replace 30 or any other number to 0

Another question, how to get the time of one specific candle, such as
mark all the candle bar at 0:00 oclock on hourly chart.

Any helps will be highly appreciated.

[Apprentice]

It 30 is the difference in Pips.
It should look like this
if source.high [period] - source.low [period]> 30 * Source: pipSize () then
...
else

If this is nunber, try to use 0,0030.

As for the date. Try This

Local date = core.dateToTable (source: date (period));
if date.year == 2000 then
...
end

But all of this with more detail provided in the Indicore SDK Help.

[xiupingge]

Hi, Apprentice
Thank you very much for your kind help.
It works fine! Let me try to read SDK for more details.
Hava a good day!

[sunshine]

Just in case, here are links to online documentation:
public method tick_stream:date
public method bar_stream:date

[jtatalov]

Can someone recommend a book(s) on programming in LUA and using Indicore?

[sunshine]

If you have not read yet, I would recommend you to refer to this section on the site:
viewtopic.php?f=28&t=2026