Re: Stream device - parsing array of pairs of floats

[Dirk Zimoch via Tech-talk <tech-talk@aps.anl.gov>]

I tested it and it hung up my ioc. Seems I have a bug in regsub.

On 15.02.19 09:55, Dirk Zimoch via Tech-talk wrote:
> Unfortunately StreamDevice cannot easily parse such interlaced arrays at 
> the moment.
> Maybe the following works:
>
> For the values:
> Separator=",";
> in "%#/[.0-9]+|//%f";
>
> For the Timestamps:
> Separator=",";
> in "%#/|[.0-9E+-]+//%f";
>
> %#/regexp/subs/ is the regular expression pre-processor, here removing 
> the "other" array from the input. Performance may be not so good and 
> scales like O(n²) with the array length because of all the copying 
> involved.
> One of the records should be active having the 'out' command that 
> produces the reply. The other should be "I/O Intr" reading the time 
> stamps passively.
> Not tested. Hope it works.
> Dirk
>
>
> On 14.02.19 18:35, Joao Afonso via Tech-talk wrote:
> > Hello,
> >
> > I have a string returned by a device, representing an array where each 
> > element is a pair <time, value>:
> > - each pair is separated by "|": <timestamp>|<value>
> > - each element of the array separated by ","
> > - all values are floats
> > - the timestamp increment may not be linear (that is why it needs to 
> > be recorded)
> > Example
> > 0.1000|0.1230000E+00,0.2000|0.4560000E+00,0.3000|0.7890000E+00, [...]
> >
> > Is it possible to parse this using stream device (into two waveform 
> > records)?
> > Or do I have to use something more powerful such as asynDriver?
> > I have seen several examples, but only with using simple type 
> > elements, not like this.
> > As a followup, is it possible to do the inverse, merging two waveform 
> > records into a string?
> > Thank you in advance,
> > Joao
> > CERN TE-EPC-CCS