Re: [ferret_users] appending ensemble slabs

["Ansley C. Manke" <ansley.b.manke@xxxxxxxx>]

Hi Ryo,

Yes. When we implemented 6-D Ferret we didn't want to make the names E, F, M, and N into reserved pseudo-variable names, akin to X,Y, I, J, etc. Existing scripts use some of those as variable names, and we didn't want to have "LET n = ..." suddenly become an invalid command.  So the pseudo-variables in the E and F directions are therefore _E, _F, _M, and _N.  And for symmetry, you can also use an underscore before any of the other direction variables, _X or _K.

Here's the whole scoop on pseudo-variable names: http://ferret.pmel.noaa.gov/Ferret/documentation/users-guide/variables-xpressions/VARIABLES#_VPINDEXENTRY_255

Ansley

On 5/2/2018 8:15 AM, Ryo Furue wrote:

Hi Ansley,

Thank you for the tips!

define axis/e=1:5:1 e5ax

let evals = _e[ge=e5ax]

So, I guess the physical(?) name for the E axis is "_E", as the physical name for the Y axis is "Y".  Is that right?  In other words, what you show above is parallel to

define/axis/y=1:5:1 y5ax

let yvals = y[gy=y5ax]

And thank you for the resolution of the problem.  That's a nice conclusion.  But I understand it's usually better to have a fixed axis.

Cheers,

Ryo