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Re: Array multiplication: implicit loop query
email@example.com (george Millward) wrote in message news:<firstname.lastname@example.org>...
> Hi there
> I was just calculating the following equation:
> DEN_H = MMR_H * Pres * RMT / ( atomic_mass_H * Gas_constant * TN )
> These numbers are 3D arrays, 1D arrays and constants, i.e.,
> MMR_H = fltarr(30,91,40)
> Pres = fltarr(30)
> RMT = fltarr(30,91,40)
> atomic_mass_H = constant
> Gas_constant = constant
> TN =fltarr(30,91,40)
> The result of this is DEN_H (previously undefined) which ends up being
> fltarr(30) - i.e., 1 dimensional.
> To my mind DEN_H should be 3D (30,91,40) - shouldn't it ? Doesn't IDL
> understand that I am implicity doing a full 3D calculation here ?
> would seem that, to get this to work I need to make
IDL> a = indgen(20,20)
IDL> b = indgen(20)
IDL> c = b * a
IDL> help, c
C INT = Array
I believe you need to REPLICATE 'Pres' as needed.