linear interpolation advantages and disadvantages

In general, the destructor function is also implemented as anĮxternal function. Important to make sure that any memory allocated by the The course of a single expression evaluation. Variable in a function, for example, may be created and destroyed in But an ExternalObject declared as a protected Instantiated in a model will generally persist until the end of the This allows the Modelica runtime to clean up any The destructor function is invoked whenever the ExternalObject Implemented in C and which do know how to access the data represented Passed to other functions, as we shall see in a minute, that are also It is not possible to access theĭata behind this pointer from Modelica. Modelica compiler, a VectorTable is just an opaque pointer The essential point here is that from the point of view of the This annotation tells the Modelica compiler where to find the source Is passed the contents and size of the ybar variable.įollowing the call to createVectorTable is an annotation. Pointer) is returned by a C function named createVectorTable which (which is the output of this function and represents the opaque That other language is C (as indicated by the 'C' following theĮxternal keyword). Implemented in some other language besides Modelica. The algorithm section is normally used to compute the Unlike our previous examples, it does not include an algorithm The definition of the constructor function is unusual because, e.g, the data argument in our declaration of the That initialization process should be passed as argument to theĬonstructor function. VectorTable is created ( e.g., the declaration of the vector The constructor function is invoked when an instance of a

Would expect when compared to our previous test case: Simulating this model, we see that the results are exactly what we Variable into that function in place of our raw interpolation data. Previous case except that we use the InterpolateExternalVectorįunction to perform our interpolation and we pass the vector Vector object, the rest of the model is virtually identical to the But for now think of it as something that represents We’ll discuss exactly what a VectorTable is Instead, we create a special variable vector whose type The fact that we don’t pass our data directly into the interpolationįunction. Here the main difference between this and our previous test case is Model IntegrateInterpolatedExternalVector 'Exercises the InterpolateExternalVector' parameter VectorTable vector = VectorTable ( ybar = ) Real x Real y Real z equation x = time y = InterpolateExternalVector ( x, vector ) der ( z ) = y annotation.

Linear interpolation advantages and disadvantages