December 10th, 2018, 07:40 PM  #1 
Newbie Joined: Dec 2018 From: santiago Posts: 3 Thanks: 0  Doubt parameterization
Good afternoon guys, I'm studying some math and I came across a problem. It is necessary, from a graph obtained through experiments, to carry out the parameterization of this one. Honestly, I did not quite understand what he wants with this parameterization. Follow the graph below (on the logarithmic scale). exemplo.jpg Intuitively, I thought of this parameterization as a way to describe the graph mathematically, for that I divided it into 2 regions of the domain and for each one I found a corresponding function, for example, in the first region, I found a first degree equation (a and b would be the parameters?) and so on. Does it have anything to do with it? If not, what would this parameterization be? Thanks in advance! 
December 10th, 2018, 08:53 PM  #2 
Global Moderator Joined: Dec 2006 Posts: 20,978 Thanks: 2229 
A first degree equation would have a straight line graph, but there is an evident curve in the "lefthand part" of the graph that's particularly noticeable near the "righthand part".

December 11th, 2018, 05:04 AM  #3 
Newbie Joined: Dec 2018 From: santiago Posts: 3 Thanks: 0 
Hello skipjack, thanks for the answer. Ok, so, briefly (in this case), is the parameterization really finding the parameters (for example, parameters of functions and so on) needed to "write" the experiment mathematically?

December 11th, 2018, 07:40 AM  #4 
Global Moderator Joined: Dec 2006 Posts: 20,978 Thanks: 2229 
Does the question relate to an invented problem or to a real experiment? The graph looks very artificial to me, and doesn't even tell you what is being represented on the two axes or how accurate the data is. The horizontal axis has no number labels.

December 11th, 2018, 08:04 AM  #5 
Newbie Joined: Dec 2018 From: santiago Posts: 3 Thanks: 0 
It's just a hypothetical problem. In fact, it says, I did not put it, they are particle interactions, the x axis represents the energy of the incident particle, I took off the values to get clearer in the figure. (the yaxis, is the crosssection of the interaction). The idea is to parameterize this. Thanks again and sorry for the inconvenience.


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