Finding the forces for the cable

Hi !

I'm starting to work with matlab so i think this problem isn't complicated, what i need to discover is the force at each cable and the forces at A and plot those forces, the load G(200kn) varies from 0,01m to 3,99m.

[Adam]

If you have your maths sorted out then it should be easy to transfer into Matlab, if not then you should probably start there first.

[Emilio Janssen]

I have the solution for this example but in this case the load at G doesnt varies.

[Emilio Janssen]

This is the skecht that I started,