Subject: |
Re: Stream device - parsing array of pairs of floats |
From: |
Dirk Zimoch via Tech-talk <[email protected]> |
To: |
<[email protected]> |
Date: |
Fri, 15 Feb 2019 09:55:35 +0100 |
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
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- Re: Stream device - parsing array of pairs of floats Dirk Zimoch via Tech-talk
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