This is provided by the special `__call__` method of a CellVariable, which you
would invoke with `var([[xval], [yval]])`.
>>> help(fp.CellVariable.__call__)
Help on method __call__ in module fipy.variables.cellVariable:
__call__(self, points=None, order=0, nearestCellIDs=None) unbound
fipy.variables.cellVariable.CellVariable method
Interpolates the CellVariable to a set of points using a
method that has a memory requirement on the order of Ncells by
Npoints in general, but uses only Ncells when the
CellVariable's mesh is a UniformGrid object.
:Parameters:
- `points`: A point or set of points in the format (X, Y, Z)
- `order`: The order of interpolation, 0 or 1, default is 0
- `nearestCellIDs` : Optional argument if user can calculate own
nearest cell IDs array, shape should be same as points
Tests
>>> from fipy import *
>>> m = Grid2D(nx=3, ny=2)
>>> v = CellVariable(mesh=m, value=m.cellCenters[0])
>>> print v(((0., 1.1, 1.2), (0., 1., 1.)))
[ 0.5 1.5 1.5]
>>> print v(((0., 1.1, 1.2), (0., 1., 1.)), order=1)
[ 0.25 1.1 1.2 ]
>>> m0 = Grid2D(nx=2, ny=2, dx=1., dy=1.)
>>> m1 = Grid2D(nx=4, ny=4, dx=.5, dy=.5)
>>> x, y = m0.cellCenters
>>> v0 = CellVariable(mesh=m0, value=x * y)
>>> print v0(m1.cellCenters.globalValue)
[ 0.25 0.25 0.75 0.75 0.25 0.25 0.75 0.75 0.75 0.75 2.25 2.25
0.75 0.75 2.25 2.25]
>>> print v0(m1.cellCenters.globalValue, order=1)
[ 0.125 0.25 0.5 0.625 0.25 0.375 0.875 1. 0.5 0.875
1.875 2.25 0.625 1. 2.25 2.625]
> On Jun 30, 2016, at 11:08 PM, 正义的小偷 <[email protected]> wrote:
>
> Sorry for my english.
> I am new to fipy, and I have some trouble with getting value fo cellvariable.
> I want to get the value of cellVariable at a certain cell via coordinate of
> cellCenter. The only way I know to get the value is the value property. Is
> there any other way to get the value via coordinate ?
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