Test page with index 2
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Kratos
' T u t o r i a l s
Test Page 2 Title
For a function
, it is known the values for 3 points:
For a three nodes quadratic element, the interpolation of such function is:
For this quadratic approach, the resulting expression is:
and then:
The following picture shows the error, much bigger outside of the interval.
If the set of points is:
that means:
For the four nodes cubic element, the interpolation of such function is:
Remember the expression to obtain each
:
therefore:
The resulting expression is exactly the same to the original one:
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Test page with index 2
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