Experimental Physics and
Industrial Control System

Allison, Stephanie wrote:
>...
> Here is a radical thought - it would be nice to have a new string field (ie,
> .FMT) that specifies how to display the value as a string.  Then I could set
> up the format of our vacuums (ie, VALs that should always be displayed using
> exponential notation) in the database instead of having to override the
> default display format in each client.  Also, some save/restore tools won't
> restore the proper values of things like vacuum limits unless you set a
> ridiculously large PREC.

Well, this might be silly, but if you need flexible format control
on a small scale, you can easily get it from the scalcout record.
Just for fun (well, it seemed fun to me, anyway ... at the time) I
made one use a variable precision and a variable format character:

scalcout.A = "myPV.VAL CP NMS"
scalcout.B = "myPV.PREC CP NMS"
scalcout.AA = "f"   (or other printf format character)
scalcout.CALC = "printf("%."+str(B)[0,'.']+AA,A)"
                             \___________/
                                   |
                             PREC as a string
                            (yuck! "int(B)" should do this)
For
    myPV.VAL == 12.34567
    myPV.PREC == 3
    scalcout.AA == "f"  --> "12.346"
    scalcout.AA == "e"  --> "1.235e+01"
    scalcout.AA == "g"  --> "12.3"

--
Tim Mooney ([email protected]) (630)252-5417
Beamline Controls & Data Acquisition Group
Advanced Photon Source, Argonne National Lab

References:

RE: PREC Allison, Stephanie

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