Re: Ploting data with Non Linear X Locations

[H.S. <hs....@gm...>]

On 24/09/11 01:43 PM, Misc wrote:
> I want to plot data from a sensor which is supposed to be taking samples
> every so many hours over months of time.  However, since human interaction
> is involved, there will be gaps in the data stream and the time between
> samples will not always be constant. The data may stop for several days and
> then when it does start up it may even have a different time between
> samples.   The question I have is after QWT gets the bounding rectangle,
> will the SW automatically place the data in the correct X location based on
> the actual X Value or does it require the data to have a constant "delta
> time" between each sample?

It don't think you should have problem at the frequency of data arrival
being non-uniform.

I have an application that plots data received over a network. The data
arrives at different intervals due to various reasons. What I do is to
save that data in a curve and plot when desired. For example, even if
the data comes as bursts during some seconds, I update my graph only
after a fixed time, e.g. after every 1/2 sec., I just discard the data
that arrived before it was to be plotted.

In your case, the time interval is very large as compared to mine, but
the same principal holds.

Good luck!


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