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Re: executing a string in VM without using 'EXECUTE' [message #50637 is a reply to message #50636]

Fri, 06 October 2006 02:40

Maarten[1]
Messages: 176
Registered: November 2005

Senior Member

gav wrote:
> There is probably a simple solution to this but I can't find it: I
> want to execute the string below in VM, without using (can't use) the
> 'EXECUTE' command. Any ideas / code etc greatfully received.
>
> com='speci=where('+formula+',speccount) ';write executable
> string
> t=execute(com) ;execute string
>
> the 'formula' is "(mr(*,*,159) le 8 or mr(*,*,170) gt mr(*,*,159)
> or mr(*,*,235) gt mr(*,*,159) )"

extract constants in the array indexing, and the limits with the
strmid/stregex functions. Turn them into variables, and build the
equation that way. Something like this:

b = stregex(formula,
'([0-9]+)[^0-9]+([0-9]+)[^0-9]+([0-9]+)[^0-9]+([0-9]+)[^0-9] +([0-9]+)[^0-9]+([0-9]+)',
/extract, /sub)
speci=where(mr[*,*,long(b[1])] le long(b[2]) or mr[*,*,long(b[3])] gt
mr[*,*,long(b[4])] or mr[*,*,long(b[5])] gt mr[*,*,long(b[6])],
speccount)

That is , assuming the structure of the formula remains the same, only
the values change. If you want something more general, you have to
explain where teh string comes from.

Maarten

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[Message index]

		Re: executing a string in VM without using 'EXECUTE' By: greg michael on Fri, 06 October 2006 02:42
		Re: executing a string in VM without using 'EXECUTE' By: Maarten[1] on Fri, 06 October 2006 02:40
		Re: executing a string in VM without using 'EXECUTE' By: Allan Whiteford on Fri, 06 October 2006 02:30

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