I like to measure the mean velocity (magnitude and x,y and z direction) with a python annotation. What is the right variable for it ? I tried mean(U(inputs[0])) for the magnitude mean(Velocity(inputs[0])) for the magnitude mean(Ux(inputs[0])) in x direction mean(U_x(inputs[0])) in x direction …

The right formula would depends on the name of your arrays. Alternatively, you can use descriptive statistics filter.

Ok, is there a predefined variable for the velocity in x, y, z direction and the magnitude ? I can display the mean velocity, i used the code mean(U) this ist the (Ux+Uy+Uz)/3.

Not sure to follow what is your question. If “U” is your vector, the U_X, U_Y, U_Z are the directional scalars and mag(U) the magnitude.

Thank you very much Mathieu Westphal ! Now, its getting clearer to me. In example i got an array U = [ 7, 3, -4; 5, -2, 9; 1, 6 , 4] The Ux component is [7, 5, 1], the Uy component [3, -2, 6] and Uz [ -4, 9, 4] So i tried to isolate the Ux components with mean((U) * (1,0,0) this will change the …

To be honest, this is more a python question than a ParaView question here. what about mean(U_X) ?

yes it is, you are right. Its for U_x mean(U[:,0]). https://www.python-kurs.eu/numpy_arrays_erzeugen.php : for all rows and 0 for the first column like x. best regards kai

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Python Annotation - Variable for Velocity Magnitude and x,y,z direction

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