[ncl-talk] converting string into a variable name

[Dave Allured - NOAA Affiliate]

Tabish, NCL string references work for file variables, but not for
in-memory variables.  See NCL reference manual, section "String references".


On Thu, Jan 26, 2023 at 8:46 AM Tabish Ansari via ncl-talk <
ncl-talk at mailman.ucar.edu> wrote:

> Hi
>
> I have several systematically named variables that I want to refer to by
> generating the corresponding string via a loop. I'm able to generate a
> string that exactly matches the variable name but I'm unable to perform any
> operations over the variables by referring to the string.
>
> Here's my code:
>
> begin
> y1 = ispan(0,1000,1)
> y2 = ispan(1000,2000,1)
> y3 = ispan(2000,3000,1)
> y4 = ispan(3000,4000,1)
> y5 = ispan(4000,5000,1)
> y6 = ispan(5000,6000,1)
> y7 = ispan(6000,7000,1)
> y8 = ispan(7000,8000,1)
> y9 = ispan(8000,9000,1)
> y10 = ispan(9000,10000,1)
> y11 = ispan(10000,11000,1)
> y12 = ispan(11000,12000,1)
> y13 = ispan(12000,13000,1)
> y14 = ispan(13000,14000,1)
> y15 = ispan(14000,15000,1)
> y16 = ispan(15000,16000,1)
> y17 = ispan(16000,17000,1)
> y18 = ispan(17000,18000,1)
> y19 = ispan(18000,19000,1)
>
> do i = 1,19
>  var = "y"+tostring(i)
>  M = max($var$)
>  m = min($var$)
>  print(M+"       "+m)
> end do
>
> end
>
> I get a syntax error with this. Is it possible to achieve the same thing
> through some other syntax in an efficient way?
>
> Thanks a lot.
>
> Tabish
>
>
> -------------------------------
> Dr Tabish Ansari
> Research Associate
> Air Quality Modelling Group
> IASS-Potsdam
> Germany
>
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