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Old   August 15, 2012, 20:25
Default Openfoam coding question
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Hi everyone, I have two questions in openfoam's coding. One is that if one variable is stated as the vector, so can it be a vector container e.g.
vector p=(
(1 2 3)
(4 5 6)
(7 8 9)
or just only used like (1 2 3)?
;the second is that if I wanna define a variable distance = mag(the z component of position-the z component of position0), I write the code as distance= mag(position.z()-position0.z()), where position and position is the vector type, but the compiler reports error, how should I make it? The original code is distance = mag(position()-position0()).
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Old   August 16, 2012, 02:09
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Considering your first question.
No, a vector is a vector. It has three components. If you want to store multiple vectors in one variable, you should make a variable of type vectorList.

Your second question is vague. Post the code you have tried, and the error message you got, otherwise we can only guess.
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Old   August 16, 2012, 02:43
Yogesh Bapat
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About your second question :

You are trying to calculate mag(position.z()-position0.z()).You need not take magnitude as you will directly get scalar when you take difference of only z-coordinates.
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Old   August 16, 2012, 03:34
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Arne Stahlmann
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One comment on your first question: I think it depends on which 'vector' you are talking about. If it is the standard OF vector, then it has three components only. But if you consider the c++ vector, then this can have more entries, as it is more like a hashSet. A construct like
std::vector<std::vector<std::pair<label, double> > > movePointsCorrelation;
e.g. contains entries in a pair of label and double values, stored in a vector (list), which are further stored in a vector (list). These vectors can then even have different sizes.

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