TGraph function to use for graph interpolation?

[Kylelee888]

ROOT Version: 6.08.06
Platform, compiler: gcc6.2

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So, I have a group of TGraphs that are related to transmission functions through certain materials, and I a trying to get a final expected graph output for intensity after all of the interactions. To do this, I was told I could take all of the data, make them into TGraphs, and then interpolate them together to get the expected output.

I currently have one root file with 4 tGraphs in it. I tried the Eval function on a canvas that had all four drawn on it, but that didn’t work. I also tried to spline them together with equally poor results. I was just curious if this was the best way to go and if there was a member function in the TGraph family that would be appropriate?

I thought maybe the Merge() function would possibly work, but it also seems like it just draws them all on the same graph, which isn’t the most useful.

[moneta]

Hi,

It is not clear to me exactly what you want to do it ? What do you mean interpolate the TGraphErrors together ? TGraph::Eval() interpolates the contained point in a single TGraph.
If you need to interpolate between all points you should then build a single object using for example Merge().

Lorenzo