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Re: Multiplying a cube by a vector [message #18226]

Thu, 09 December 1999 00:00

thompson
Messages: 584
Registered: August 1991

Senior Member

Pierre Chanial <pchanial@cea.fr> writes:

> Hi !

> Has anybody written a function that multipies an array by a vector along
> a given dimension?
> For the last dimension, one can do for an array of dimension nx,ny,nz :

> vector_unit = replicate(1, nx*ny)
> newcube = vector ## vector_unit
> newcube = reform(cube,nx*ny, nz) * temporary(newcube)
> newcube = reform(newcube, nx,ny,nz, /overwrite)

> but for the other dimensions ?

> Cheers Pierre

Pierre:

I believe that the following will what you want. If CUBE has the dimensions
(NX,NY,NZ), and VECTOR_Y has the dimensions (NY), then you can multiply the two
with the command

NEWCUBE = REBIN( REFORM(VECTOR_Y, 1,NY,1), NX,NY,NZ)

(I believe that Stein Vidar Haugan first pointed this out.)

William Thompson

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