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Looping over parameters without EXECUTE() [message #43804]

Mon, 02 May 2005 09:10

Wayne Landsman
Messages: 117
Registered: January 1997

Senior Member

The one case where I haven't figured out how to remove EXECUTE() from a
program (to allow use with the Virtual Machine) is where one wants to
loop over supplied parameters. For example, to apply the procedure
'myproc' to each supplied parameter (which may have different data
types) one can use EXECUTE() to write each parameter to a temporary
variable:

************************************************

pro doit,p1,p2,p3,p4,p5,p6,p7,p8,p9,p10,p11

;Loop over input parameters
Np = N_params()
colname = 'p' + strtrim(indgen(Np)+1,2)

for i=0,Np-1 do begin
result = execute('p=' + colname[i] )
myproc,p
endfor
**********************************************
Is there a way to avoid EXECUTE() here -- say to identify the 4th
parameter as e.g., $4 ? Of course, one can always avoid the loop and
explicitly write out the call for each parameter:

myproc,p1
myproc,p2
....
but this probably becomes unreasonable at around 20 parameters.

One solution is to have the program read an array of pointers rather
than multiple parameters. But this has the disadvantages of losing
backwards compatibility, as well as making the program somewhat more
complicated to use. My current default solution is to make a pointer
keyword available and say that data must be passed this way instead of
via parameters, if the user wants to use the VM.

Thanks, --Wayne

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[Message index]

		Looping over parameters without EXECUTE() By: Wayne Landsman on Mon, 02 May 2005 09:10
		Re: Looping over parameters without EXECUTE() By: Ken Mankoff on Tue, 03 May 2005 16:31
		Re: Looping over parameters without EXECUTE() By: R.Bauer on Tue, 03 May 2005 11:00
		Re: Looping over parameters without EXECUTE() By: R.Bauer on Tue, 03 May 2005 10:47
		Re: Looping over parameters without EXECUTE() By: JD Smith on Tue, 03 May 2005 10:41
		Re: Looping over parameters without EXECUTE() By: Thomas Pfaff on Tue, 03 May 2005 06:43
		Re: Looping over parameters without EXECUTE() By: JD Smith on Mon, 02 May 2005 18:57

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