Advantages are that you can see the arc lengths
disadvantages some times it doesn't work because of insufficient vertices's or arcs.
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If the product of two matrices is an identity matrix then, one matrix is inverse of the other. i.e. AB = I then, A = B-1 and B = A-1Inverse of matrix can be found by using these two results:A = AI and A = IA.By using these results inverse of a matrix can be found by applying same elementary row or column operation on both sides. A on R.H.S. remains as it is.
The advantages of using weighted averages are that it smooths out fluctuations due to statistical outliers. The disadvantage is that this gives a uniformity in the statistics and can make it difficult to project trends.
Equations are eaiser tofind with smaller numbers. Once you get the equation, you can find any missing numbers with is very helpful. Disadvantages are that equations are harder to find with bigger numbers.
Multiply it by the identity matrix.