Uninitilaized variable Error Message on VARDIM1 and VARDIM2

Hoa Tu — Wed, 12 Jan 2011 05:09:24 GMT

I think this is a bug of the GDL program that produce this error message when using the VARDIM functions. I find it very annoying when running the check script.

! Example from GDL Reference Guide Page 237
DIM f1 [5]
FOR i = 1 TO VARDIM1(f1) ! Uninitialized variable Error Message here
f1 = i
NEXT i

But if I do this, the Error Message will not come up:

DIM f1 [5]
f1[1] = 0
f1[2] = 0
f1[3] = 0
f1[4] = 0
f1[5] = 0

FOR i = 1 TO VARDIM1(f1)
f1 = i
NEXT i

Is there any way to overcome this problem ?

Regards,

Hoa

Re: Uninitilaized variable Error Message on VARDIM1 and VARD

Barry Kelly — Wed, 12 Jan 2011 05:26:43 GMT

"From the GDL manual wrote:
VARDIM1(expr)
VARDIM1(expr)
VARDIM2(expr)
VARDIM2(expr)
These functions return as integers the actual dimension values for the (array) expression specified as a parameter. They must be used if you want
to handle correctly all actual elements of a dynamic array or an array parameter. If no element of a dynamic array was previously set, the return
value is 0. For one-dimensional arrays VARDIM2 returns 0.

So you are saying to go FOR i = 1 to 0

But in you second part of the example you have given values to tha array so it now works.

Why don't you just say ...
FOR i = 1 TO 5
f1 = i
NEXT i

Barry.

topic Uninitilaized variable Error Message on VARDIM1 and VARDIM2 in Libraries & objects

Uninitilaized variable Error Message on VARDIM1 and VARDIM2

Re: Uninitilaized variable Error Message on VARDIM1 and VARD