Integration using Cumtrapz backwards instead of forwards

Hey all, I am trying to create a program that will take distributed point loads from lift generated by a wing and create moment and shear diagrams using numerical integration through cumtrapz

The way I am doing this is by integrating the points and locations which gets me a shear force, but because cumtrapz integrates numerically forward, it technically creates the right graph but backwards from a conventional beam analysis, which creates cuts. Is it possible to make Cumtrapz work backwards? I have attached images of what I want vs what I get for an example

Desired Shear diagram

Obtained Shear Diagram

The obvious solution is just to subtract the maximum value from the graph but this does not encapsulate the essence of what's going on, and also creates a further problem in the bending moment diagram.

Here's the code

L_dist   =[10 9 8 7 6 5 4 3 2 1 0];
locations=[0 1 2 3 4 5 6 7 8 9 10];


shear.z = cumtrapz(locations,(L_dist));
figure('Name','shear - z','NumberTitle','off');
plot(locations, shear.z);

Answer 1

[Sean de Wolski]

Easy solution is to just flip everything

L_dist   =[10 9 8 7 6 5 4 3 2 1 0];
locations=[0 1 2 3 4 5 6 7 8 9 10];
shear.z = flip(cumtrapz(flip(locations),flip(L_dist)));
figure('Name','shear - z','NumberTitle','off');
plot(locations, shear.z);

[Ramses Young]

I cant believe I didn't think of this, but you sir are a legend, I really appreciate it.