Why must the user be able to calculate unknown forces at the vertices?


If the forces are not given in the problem statement, the user must use his or her statics knowledge (possible utilizing the moment about some point or the sum of  forces in the x or y direction) to find every force on every point.  The program needs this information to properly calculate the forces present in each truss.  For information on why the program can not calculate these forces on the vertices for you, try this link.
 
 

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