| How to create a varying variable? [message #89388] |
Mon, 06 October 2014 07:13  |
atmospheric physics
Messages: 121
Registered: June 2010
|
Senior Member |
|
|
Hello,
I want to create a varying variable, 'varJJJ' as below:
varJJJ = FLTARR(nc,nr)
Here JJJ = STRING(indgen(101),FORMAT='(I03)')
Is this possible? Can anyone have a better suggestion?
Thanks in advance,
Madhavan
|
|
|
|
| Re: How to create a varying variable? [message #89389 is a reply to message #89388] |
Mon, 06 October 2014 07:25  |
Matthew Argall
Messages: 286
Registered: October 2011
|
Senior Member |
|
|
This discussion ultimately ends with the Execute command, which most agree is a very bad option for naming variables. Instead, try using a list, structure, or concatenated array:
;List
myList = list()
myList(1) -> Add, fltarr(nc, nr)
myList(2) -> Add, fltarr(nc, nr)
;Array
myArr = [[[fltarr(nc, nr)]], [[fltarr(nc, nr)]]]
;Structure
myStruct = create_struct('Tag1', fltarr(nc, nr), 'Tag2', fltarr(nc, nr))
|
|
|
|
| Re: How to create a varying variable? [message #89390 is a reply to message #89389] |
Mon, 06 October 2014 07:33 |
Matthew Argall
Messages: 286
Registered: October 2011
|
Senior Member |
|
|
> ;List
> myList = list()
> myList(1) -> Add, fltarr(nc, nr)
> myList(2) -> Add, fltarr(nc, nr)
Typo. Should be
;List
myList = list()
myList -> Add, fltarr(nc, nr)
myList -> Add, fltarr(nc, nr)
I suppose you could also create a hash
;Hash
myHash = hash()
myHash('Key1') = fltarr(nc, nr)
myHash('Key2') = fltarr(nc, nr)
|
|
|
|
| Re: How to create a varying variable? [message #89394 is a reply to message #89388] |
Mon, 06 October 2014 08:26 |
Paul Van Delst[1]
Messages: 1157
Registered: April 2002
|
Senior Member |
|
|
On 10/06/14 10:13, Madhavan Bomidi wrote:
> Hello,
>
> I want to create a varying variable, 'varJJJ' as below:
>
> varJJJ = FLTARR(nc,nr)
>
> Here JJJ = STRING(indgen(101),FORMAT='(I03)')
>
> Is this possible? Can anyone have a better suggestion?
>
> Thanks in advance,
> Madhavan
First thing that occurs to me is: why?
I'm not trying to be obstreperous, just asking for some context since
this sort of request is usually more of a design issue than a language one.
cheers,
paulv
p.s. And, FWIW, Matthew's suggestion using a hash is what I would
recommend since you can use the dynamic "JJJ" to access the particular
value that you want. E.g.
IDL> h=hash()
Use string of number:
IDL> jjj='101'
IDL> h[jjj] = findgen(20,10)
IDL> help, h['101']
<Expression> FLOAT = Array[20, 10]
Or use actual number (why convert to string?):
IDL> nnn=101
IDL> h[nnn] = dindgen(14)
IDL> help, h[101]
<Expression> DOUBLE = Array[14]
where, as you can see, h['101'] and h[101] reference different values in
the hash.
If you have an older version of IDL (i.e. no hashes) then you could put
together something similar using pointer arrays.
All of the plumbing (for either methodology) could then be wrapped up
into "Init", "Set" and "Get" functions so your code is protected from
the implementation details.
|
|
|
|
comp.lang.idl-pvwave archive
Members
Search
Help
Login
Home
