Hi,
given a table of
(x,y,z,cx,cy,cz) where cx, cy, cz are the components of a unit vector,
I would like to make a plot that looks like this:
With the unit vector pointing out of its associated x,y,z coordinate.
Can anybody help me find the easiest way to do this? I have tried multiple ways but all are pretty awkward.
A big thank you to anybody who can help me!!
This suggestion is outside ROOT, but you might want to checkout pgfplots.
Here is a quiver plot example: http://pgfplots.net/tikz/examples/differential-equation/
There is a whole section on quiver plots in the pgfplots manual.
Or you could try TGraphBentArrows and use one of the error bars as your vector.
Thanks, TGraphBentArrows is a nice way for me to do it!
Hi ksmith,
What is the meaning of these variables in TGraphBentErrors:
https://root.cern.ch/doc/master/TGraphBentErrors_8h_source.html
33 Double_t *fEXlowd; ///<[fNpoints] array of X low displacements
34 Double_t *fEXhighd; ///<[fNpoints] array of X high displacements
35 Double_t *fEYlowd; ///<[fNpoints] array of Y low displacements
36 Double_t *fEYhighd; ///<[fNpoints] array of Y high displacements
I want to direct the x high error (which is a fixed length) at a certain angle theta, just as you would
direct a vector of length r at a certain angle theta.
How do I do it?
Thank you very much for any reply!
If for example I set the fEXhighd to be a constant for all points on my scatter plot, this affects the points differently: For all points I did the following
tgraph->SetPointError(counter1,0,0,0,50,0,0,0,0.5);
I am confused why the points have different errors when they were assigned the same constant value.
