Using QwtPlot to plot binary data from file

[develofer]

I have a small question that could be obvious for many of you, but not for me...

Once you have your data inherited from QwtData
(e.g. in my case I have float numbers)

How do you pass it to setData (or setRawData in my case)?

Here the definitions of setData and setRawData:
(From qwtplotcurve manual)

void QwtPlotCurve::setData	(	const double * 	xData, const double * 	yData, int 	size	  )

void QwtPlotCurve::setData	(	const double * 	xData, const double * 	yData, int 	size	  )

To copy to clipboard, switch view to plain text mode 

void QwtPlotCurve::setRawData	(	const double * 	xData, const double * 	yData, int 	size	  )

void QwtPlotCurve::setRawData	(	const double * 	xData, const double * 	yData, int 	size	  )

To copy to clipboard, switch view to plain text mode 

I do not see the link in between my YourData (derived from QwtData) and how to "link" it to my QwtPlot...

Thank you...

[Uwe]

void QwtPlotCurve::setData(const QwtData &data);

void QwtPlotCurve::setData(const QwtData &data);

To copy to clipboard, switch view to plain text mode 

All other setData methods are convenience methods creating an internal QwtData object. Passing values to your individual data object needs to be done via the API of your derived data class.

Uwe

[kja]

Hi, I also want to plot some data from a data file. I have QWT 6.0 and it doesn't include QwtData. Does anyone know where I can get this code, or if there is another way to make a plot from a data file with the tools in qwt 6.0?

Thanks

[KingsleyHau]

Hi,
I just posted a thread about using data from a file to make a plot so I guess it doesn't hurt to ask here too.
Basically after reading the whole thread and trying to make sense of things, I still don't full understand... >.<

My main problem is:
The data is in a file; I want to make a bridge to this data...
Does this mean a bridge to the data file? or has the data already been read in somewhere. If so, then how?
somewhere mentioned above is a "bridge to an array", but my data is too big to fit into an array and multi-dimensional arrays dont seem to work (for qwtplot).

Any help will be appretiated!
Thanks