[ferret_users] i index from X

[Namba Takaya <takayanamba7@xxxxxxxxxxx>]

Dear user

I like to know the i index from x value.

This is a simple exmaple I did.

define axis/x=290:315:`25/570`/unit=degree xaxis
define grid/x=xaxis xgrid
let xx=x[g=xgrid]
list xx[i=570]
let ii=i[g=xgrid]
list ii[x=315]


I expected 570 by "list ii[x=315]", but the return is 571 
even though I got 315 by "list xx[i=570]".

Is this wrong way to get i index from X. Any other simpler
ways?

Best Regards,

Takaya Namba













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