Advantage and disadvantage of diagonal scale
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ADVANTAGE :
Diagonal scale is used in engineering to read lengths with higher accuracy as it represents a unit into three different multiple in metres, centimeters and millimeters. Diagonal scale is an important part in Engineering drawings.
DISADVANTAGE :
a diagonal matrix is trivial and therefore reduces the numerical time needed to solve the problem. To obtain a diagonal mass matrix using Lagrange Elements it is also necessary to have hexahedral elements (as far as I know from seismic wave problems). Therefore you loose geometric flexibility when creating a mesh.
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