User sub routines (Groovy): How using paramSpatialCurrent[k,v]?

Example

Example	Create a new 2D magneto static project. This is a plan project, with a depth of domain of 50 mm.
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2 Define:	Creates a spatial quantity, a 3D vector: Name it “ VECTOR_MUR ”, Component values are x = 5000, y = 5, z = 0.
	Create a linear magnet “ MAGNET ” described by the Br module: Remanent flux density (T) = 1.6 Relative permeability = 1.01
	Create an user material “ MAT_1 ”: Select “ User magnetic properties ” In the tab “Spatial quantity”, select “ VECTOR_MUR ”
3 Attribute the material to the faces region Attribute the region to the face…	Create face region “ MAGNET ”, “ AIR ” and “ STEEL ” Assign the material “ MAT_1 ” to the “ STEEL ” region … Assign the material “ MAGNET ” to the “ MAGNET ” region … For the magnet region, give a magnetic direction (following axis x…) Assign faces region to faces… and so on….
4	Click on the “ Edit user function ” to see and modify into the python editor the groovy sub routine “MaterialLaw.groovy”. These files are in the directory: “....YOUR_FLUX_PROJECT.FLU\persistent\groovy ”
5	Type the following groovy (step 8) code in the sub routine public void compute (){} : User parameter is paramSpatialCurrent“Vector_mur”. This is a double value type. The first component starts with the 0 pointer. Note: In the key “Vector_mur” the first letter is writing with an upper case and the following, in lower case.
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7	Solve the project
8 x= 5000, y = 5, z = 0.
9	Delete the previous results and modify the Vector_mur components: x = 5, y = 5000, z = 0 solve again the flux project:
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