Re: Stream device - parsing array of pairs of floats

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

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