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  • xarray · 1 ✖
id node_id number title user state locked assignee milestone comments created_at updated_at ▲ closed_at author_association active_lock_reason draft pull_request body reactions performed_via_github_app state_reason repo type
280899335 MDU6SXNzdWUyODA4OTkzMzU= 1773 Use of Xarray instead of np.meshgrid GProtoZeroW 11997114 closed 0     7 2017-12-11T05:37:02Z 2017-12-14T01:58:50Z 2017-12-14T01:58:50Z NONE      

Is there a way to have xarray do what np.meshgrid does, for example, if I have a scaler, or vector function that I have generated via sympy or whatever. If need to plot it over spacetime region I currently have no choice but to try to navigate meshgrid instead I would prefre that I can define my spacetime domain to xarrays dimensions/coords and then pass it a function and store the functions result at the internal cell postions

This may also be an issue of the weather example just not working for me ``` import numpy as np DomainSpaceTimeSize=5 #using cartesian 4D SpaceTimeDensity=[100, 5] #100 divisions in space 5 in time

xAxisDomian=np.linspace(-DomainSpaceTimeSize, +DomainSpaceTimeSize, SpaceTimeDensity[0]) yAxisDomian=np.linspace(-DomainSpaceTimeSize, +DomainSpaceTimeSize, SpaceTimeDensity[0]) zAxisDomian=np.linspace(-DomainSpaceTimeSize, +DomainSpaceTimeSize, SpaceTimeDensity[0]) tAxisDomian=np.linspace(0, +DomainSpaceTimeSize, SpaceTimeDensity[1])

DummyScalerFunction=lambda x, y, z, t: np.cos(1x+2y+3z-4t)

Manual Vertex Results: DummyScalerFunction(xAxisDomian[0], yAxisDomian[0], zAxisDomian[0], tAxisDomian[0]) DummyScalerFunction(xAxisDomian[-1], yAxisDomian[0], zAxisDomian[0], tAxisDomian[0]) DummyScalerFunction(xAxisDomian[0], yAxisDomian[-1], zAxisDomian[0], tAxisDomian[0]) DummyScalerFunction(xAxisDomian[0], yAxisDomian[0], zAxisDomian[-1], tAxisDomian[0]) DummyScalerFunction(xAxisDomian[0], yAxisDomian[0], zAxisDomian[0], tAxisDomian[-1]) DummyScalerFunction(xAxisDomian[-1], yAxisDomian[-1], zAxisDomian[-1], tAxisDomian[-1]) ```

What I have to do with meshgrid X, Y, Z, T=np.meshgrid(xAxisDomian, yAxisDomian, zAxisDomian, tAxisDomian) DummyScalerFunction(X, Y, Z, T)

And this is why I want xarray do have the ability to do this, because if I want want to know what my scaler field values is at (x:0.0, y:1.0, z:0.0, t:3.0) well good luck trying to index the above. But if this was in xarray I would be able to call up the value of this particular field at said location via something like data__['ScalerField', {x:0.0, y:1.0, z:0.0, t:3.0}, 'nearest']

 
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   completed xarray 13221727 issue

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