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. 2012 Oct 8;3:383. doi: 10.3389/fpsyg.2012.00383

Figure 1.

Figure 1

Arm consisting of three segments (L1, L2, and L3) that are connected by three hinge joints. The end-effector position is described by the vector R. D1 and D2 describe the diagonals. The arm can move in a two-dimensional plane, but has three DoF (joints), one more than necessary.