CFD Online Discussion Forums - [General] Get the velocity values of a streamline

Hi all,

Here is a piece of code for a programmable filter. The idea is to get the all velocity values of each streamlines.

If you look at the streamtracer output in a spreadsheet view, and in particular the integration time column, you will notice that each streamline begin with a zero.
So to isolate each streamline, I check all the zeros of the integration time column.

Then I want to use the "j" variable to slice the velocity array

Code:

 

from vtk.numpy_interface import dataset_adapter as dsa

from vtk.numpy_interface import algorithms as algs



input0 = inputs[0]

IntegrationTime = input0.PointData["IntegrationTime"]

Velocity = input0.PointData["Velocity"]



index = algs.where(IntegrationTime==0)



j=index[0][1]



print'j value : ', j

print'j type : ', type(j)

print j[0]

I thought that the variable "j" would be an integer but I think there is a bug because here is the result I have got in the output window (picture enclosed)

What did I missed ?!