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[ferret_users] variable unknown or not in data set: BAD



Dear Users,

I would like to find out what causes this error (during calculating Keetch-Byram index), also, how to fix this simple calculation.

The error message is BAD variable definition. Repetition until L=7 works fine, when an important variable becomes negative (-9), it defines during a calculation a BAD variable (the changing basic variable), and the next iteration stops.
When I removed the quotes(let kbdix=`kbdi`), naturally came stack overflow.
Here is what I used, and the bottom lines are the results of the script.

Thanks for you help and enjoy August wherever you are,

Peter Szabo
-------

yes? let kbdi=0
yes? repeat/l=2:365 (let kbdix=`kbdi`; let tempy=var15[d=2,l=`l-1`,k=1]-273.15; let lr=if var202[d=1,l=`l`,k=1] lt 0.05 then 0 else var202[d=1,l=`l`,k=1]; let dkbdi_5=if (dslr[l=`l`] eq 0) and (lr[l=`l`] ge 5) then (-1*lr[l=`l`]+5) else 0; let dkbdi=if (dslr[l=`l`] gt 0) then ((kbdix-800)*(-1)*(.968*Exp(.0486*(tempy*9/5+32))-8.3)*.001/(1+10.88*Exp(-.0441*annrf/25.4))*.254) else dkbdi_5; let kbdi=kbdix+dkbdi; list/nohead dslr,lr,dkbdi_5,dkbdi,kbdi)
---

!-> REPEAT: L=7
 !-> DEFINE VARIABLE kbdix=0
 !-> DEFINE VARIABLE tempy=var15[d=2,l=6,k=1]-273.15
 !-> DEFINE VARIABLE lr=if var202[d=1,l=7,k=1] lt 0.05 then 0 else var202[d=1,l=7,k=1]
 !-> DEFINE VARIABLE dkbdi_5=if (dslr[l=7] eq 0) and (lr[l=7] ge 5) then (-1*lr[l=7]+5) else 0
 !-> DEFINE VARIABLE dkbdi=if (dslr[l=7] gt 0) then ((kbdix-800)*(-1)*(.968*Exp(.0486*(tempy*9/5+32))-8.3)*.001/(1+10.88*Exp(-.0441*annrf/25.4))*.254) else dkbdi_5

I / *:     0.0000  14.70  -9.696 -9.696 -9.696

!-> REPEAT: L=8
 !-> DEFINE VARIABLE kbdix=-9.696305
 !-> DEFINE VARIABLE tempy=var15[d=2,l=7,k=1]-273.15
 !-> DEFINE VARIABLE lr=if var202[d=1,l=8,k=1] lt 0.05 then 0 else var202[d=1,l=8,k=1]
 !-> DEFINE VARIABLE dkbdi_5=if (dslr[l=8] eq 0) and (lr[l=8] ge 5) then (-1*lr[l=8]+5) else 0
 !-> DEFINE VARIABLE dkbdi=if (dslr[l=8] gt 0) then ((kbdix-800)*(-1)*(.968*Exp(.0486*(tempy*9/5+32))-8.3)*.001/(1+10.88*Exp(-.0441*annrf/25.4))*.254) else dkbdi_5

I / *:     1.000  0.0000  0.0000  .... ....

!-> REPEAT: L=9
 !-> DEFINE VARIABLE kbdix=bad
 !-> DEFINE VARIABLE tempy=var15[d=2,l=8,k=1]-273.15
 !-> DEFINE VARIABLE lr=if var202[d=1,l=9,k=1] lt 0.05 then 0 else var202[d=1,l=9,k=1]
 !-> DEFINE VARIABLE dkbdi_5=if (dslr[l=9] eq 0) and (lr[l=9] ge 5) then (-1*lr[l=9]+5) else 0
 !-> DEFINE VARIABLE dkbdi=if (dslr[l=9] gt 0) then ((kbdix-800)*(-1)*(.968*Exp(.0486*(tempy*9/5+32))-8.3)*.001/(1+10.88*Exp(-.0441*annrf/25.4))*.254) else dkbdi_5

 **ERROR: variable unknown or not in data set: BAD
list/nohead dslr,lr,dkbdi_5,dkbdi,kbdi
Command file, command group, or REPEAT execution aborted


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