Re: [FORGED] Plotting negative infinity and nan

[Alan G. <a....@au...>]

Hi Fabian,

I am not aware of a Qwt-based way of doing what you are after, but personally I keep track of the data that is valid (i.e. not an Inf or a NaN) when I am about to call QwtPlotCurve::setRawSamples() (see http://tiny.cc/gefu5y). Then, I kind of override QwtPlotCurve::drawLines() (and QwtPlotCurve::drawSymbols() for my needs) and only plot the aforementioned valid data (see http://tiny.cc/4efu5y and http://tiny.cc/vffu5y). I don't know if it's the best way to do it, but it certainly works the way I want.

HTH, Alan.

On 27/04/19, 22:06, "Fabian Schwartau" <fa...@op...> wrote:

    Hi everyone,
    
    I am using qwt for plotting some stuff and I am experiencing some issues 
    when trying to plot data with negative infinity values (-inf) or NaN 
    values in it.
    In both cases qwt plots a line to infinity. I would personally prefer if 
    he would not plot these lines at all (like in Matlab) or at least plot 
    the -inf to negativ infinity, not positive.
    Is this intended behaviour? Can someone maybe point me to the code where 
    I can change that at least for my application?
    
    Best regards,
    Fabian
    
    
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