Hello, for educational reason, I want to show the experiment to measure the Plank constant to students using LED and Arduino.
I must get a plot like this one
so I’ve to fit just a range of the plot , i.e. Voltage > 1.8V and I wrote
TF1 *fitgraph = new TF1(“fitgraph”, “pol1”, 1.85,3.);
but When I plot, I get the fit of all data…
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