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Re: Newbie IDL question [message #52109 is a reply to message #28459]

Mon, 08 January 2007 20:04

Braedley
Messages: 57
Registered: September 2006

Member

JD Smith wrote:
> On Mon, 08 Jan 2007 15:40:55 -0800, tony.ohagan wrote:
>
>> I new to IDL but have lots of experience in other programming languages.
>>
>> It appears that all nested control statements IF/CASE/WHILE etc force me
>> to
>> suffix every line with & $ to avoid syntax errors. Is there any way of
>> ridding myself of this pain?
>>
>> Example:
>>
>> name = 'Larry'
>> CASE name OF & $
>> 'Larry': PRINT, 'Stooge 1' & $
>> 'Moe': PRINT, 'Stooge 2' & $
>> 'Curly': PRINT, 'Stooge 3' & $
>> ELSE: PRINT, 'Not a Stooge' & $
>> ENDCASE
>
> Do you mean from the command line? Put them in a file foo.pro sans & $
> and:
>
> IDL> .run foo
>
> JD

If this already in a program, you don't need the & and $. If this is
at the command line, I must ask, why are you using a case block at the
command line? Seems, well, strange, but that's just me.

If you're using if, else, for, or while, and sometimes case and switch,
then you should be using begin and end[if|else|for|while]. Here's a
short example for each:

for stooge_num=0, 3 do begin
case stooge_num of
1:begin
name='Larry'
PRINT, 'Stooge 1'
end
2:begin
name='Curly'
PRINT, 'Stooge 2'
end
3:begin
name='Moe'
PRINT, 'Stooge 3'
end
else:begin
name=''
PRINT, 'Not A Stooge'
endelse
endcase
endfor
stooge_num=temporary(stooge_num)*(-2)
while stooge_num ne 0 do begin
if stooge_num ne abs(stooge_num) then begin
stooge_num=abs(temporary(stooge_num))
print, 'Ahh, negative number!'
endif else begin
stooge_num--
print, "We're on our way!"
endelse
endwhile

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[Message index]

		Newbie IDl question By: John[1] on Wed, 12 December 2001 20:47
		Re: Newbie IDL question By: Mike[2] on Mon, 08 January 2007 20:53
		Re: Newbie IDL question By: tony.ohagan on Mon, 08 January 2007 20:29
		Re: Newbie IDL question By: tony.ohagan on Mon, 08 January 2007 20:26
		Re: Newbie IDL question By: Braedley on Mon, 08 January 2007 20:04
		Re: Newbie IDL question By: JD Smith on Mon, 08 January 2007 15:48

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