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plotgnuplot

strange graph with gnuplot

I have a problem with a curve fitting in gnuplot with my data:

If I use these commands:

plot "sky.txt"
f(x)=A*exp(-(t)/(sin(x)))+B

fit f(x) "sky.txt" u 1:2 via A,t,B
plot "sky.txt", f(x)

Then I get strange results, like errors of +- 1093% When I'm plotting this I get a very strange plot.

This is measured data. I have no idea what's wrong in here. Thank you for help.

enter image description here

Solution

  • ... the comment again as answer, according to the StackOverflow "rule": no answers in comments!

    You have to set the angles to degrees via: (check help angles). Default is radians.

    set angles degrees