@deltax12 take a look at this stack overflow thread for hints on how do to it.

@StudyQt1 said in Plotting chart using lots of data: Is there a generic way to decide? Use a profiler. If you're using GCC you can use https://www.thegeekstuff.com/2012/08/gprof-tutorial/ Easier way which is often enough is simply to put debug output at the beginning and end of your methods/functions with timestamps and then check the output of your application while it is running.

@J-Hilk Ok that's enough I think. One more question what will happen to scrolleft(). If I keep on incrementing these, will there be any increase in runtime memory or processor load?

Hello! If I understood correctly, and you want to use the same chart view to represent the data in different forms like bars or line, I don't see any reason why not. If you take a look at https://doc.qt.io/qt-5/qtcharts-lineandbar-example.html, you can find an example of showing both a bar and line charts in the same chart, at the same time. From there, you can modify to show just one at a time, so in your case switching between the series when the menu action is triggered.

Hi, Thanks for sharing your experience. I tried to lunch the code but it only shows a "crashed" error. @romain-donze would you please (if possible) share this project for me? I'm also a newbie and trying to visualize some real time data in histograph chart.

@suslucoder If your files all have the same structure (separator, data etc.), yes, you should actually.

@suslucoder said in Creating a chart with multiple datas: Should i delete them? No. Why would you?

@suslucoder What exactly can't you understand? In the documentation @SGaist posted there is even an example with signal/slot with parameter...

In the loop you use to read your file.

@JonB Hmmmm, i got. actually what i want to do is scrolling my chart. I have about 20 point, and i cant see all of them on the secreen. It shows just up to the size of the axis, and the others cant seen on the secreen. [image: 4e083218-de81-4970-be8b-098e263c9f8d.png] There are too many datas on the right but we cannot see.

@Pl45m4 Thank you

@JonB Thank you, it works