Scaling with SCALA (or better: aimless): Difference between revisions

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== Using combat ==
== How to switch off scaling in CORRECT ==


If one wants to completely switch scaling off in CORRECT, use
MINIMUM_I/SIGMA=50
CORRECTIONS=
NBATCH=1
in [[XDS.INP]]. MINIMUM_I/SIGMA=50 prevents the sigmas from being adjusted. This also prevents outlier rejection and geometry refinement. Since the latter may be desired it would be most appropriate to use MINIMUM_I/SIGMA=50 only after [[Optimization]] (re-cycling of GXPARM.XDS to XPARM.XDS). Prevention of outlier rejection would be also obtained by using (e.g.) WFAC1=2. NBATCH=1 removes any basic scaling done by CORRECT (as referred to by [https://journals.iucr.org/s/issues/2011/03/00/xh5026/index.html Krojer and von Delft]).


An example script to convert XDS_ASCII.HKL into a [http://www.ccp4.ac.uk CCP4] multi-record MTZ file is:
A good option might be to make CORRECT only do MODULATION correction since this is not easily available in SCALA:
 
  CORRECTIONS= MODULATION
#!/bin/csh -f
#
# Scale data from XDS
#
combat hklin XDS_ASCII.HKL hklout junk.mtz << end-combat
MONITOR 10000
INPUT XDSASCII
ADDBATCH 200            # optional: modify batch numbers
TITLE  Test combat
NAME PROJECT myproject CRYSTAL mycrystal DATASET native
END
end-combat
sortmtz hklout junk_sort.mtz  << end-sort
H K L M/ISYM BATCH I SIGI
junk.mtz
end-sort
scala hklin junk_sort.mtz hklout junk_scaled.mtz << end-scala
# scale using default parameters
run 1 batch 1 to 1000
scales rotation spacing 5 bfactor off
anomalous on
  end-scala
   
   
truncate  hklin  junk_scaled.mtz \
This can also be combined with NBATCH=1.
          hklout junk_truncated.mtz <<end-trunc
anomalous yes
nresidue  1049
labout  F=FP SIGF=SIGFP DANO=DANO_sulf SIGDANO=SIGDANO_sulf
end-trunc


In this way one gets the well-known outputs of [http://www.ccp4.ac.uk/html/scala.html SCALA] and [http://www.ccp4.ac.uk/html/truncate.html TRUNCATE], and the MTZ file junk_truncated.mtz .
== Using pointless and aimless ==


[[pointless]] produces a multi-record MTZ file (suitable for SCALA/aimless and TRUNCATE) from XDS_ASCII.HKL, or the XSCALE reflection output file (see also "[ftp://ftp.ccp4.ac.uk/ccp4/6.0.2/prerelease/runningpointlessandscala.pdf Running Pointless and Scala]"). Note that this may use [[XDS]] for some or most of the scaling.
(see above for how to switch off scaling in [[XDS.INP]], partly or fully).


== Using pointless ==
pointless -copy xdsin XDS_ASCII.HKL hklout XDS_ASCII.mtz
 
aimless hklin XDS_ASCII.mtz hklout junk_scaled.mtz | tee aimless.log
Another way of going from a XDS formatted reflection file to a multi-record MTZ file (suitable for SCALA and TRUNCATE, but not directly for structure solution) is via the [http://www.ccp4.ac.uk/prerelease_page.php#pointless pointless] program by [ftp://ftp.mrc-lmb.cam.ac.uk/pub/pre/ Phil Evans]:
 
Scaling and Assessment of Data Quality, Philip Evans, Acta Cryst D 62, 72-82.


(see also "[ftp://ftp.ccp4.ac.uk/ccp4/6.0.2/prerelease/runningpointlessandscala.pdf Running Pointless and Scala]").
Obviously, the aimless run can be modified using suitable options.


pointless -copy xdsin XDS_ASCII.HKL hklout XDS_ASCII.mtz
See below for how to run TRUNCATE.


The advantage of this route is, that the batch headers of the resulting MTZ file are correct - [http://www.ccp4.ac.uk/dist/html/combat.html COMBAT] doesn't seem to write complete and accurate headers. If one then needs to edit the batch information in this file, the CCP4 program [http://www.ccp4.ac.uk/dist/html/rebatch.html REBATCH] can be used (optional):
If one then needs to edit the batch information in this file, the CCP4 program [http://www.ccp4.ac.uk/dist/html/rebatch.html REBATCH] can be used (optional):


  rebatch hklin XDS_ASCII.mtz hklout XDS_ASCII_rebatch.mtz <<end_ip
  rebatch hklin XDS_ASCII.mtz hklout XDS_ASCII_rebatch.mtz <<end_ip
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Note: another program to work with those multi-record MTZ files is [http://www.ccp4.ac.uk/dist/html/reindex.html REINDEX].
Note: another program to work with those multi-record MTZ files is [http://www.ccp4.ac.uk/dist/html/reindex.html REINDEX].


== Using xdsconv to get the MTZ file directly (i.e. circumventing SCALA) ==
== Using truncate ==
 
#!/bin/csh -f
truncate  hklin  junk_scaled.mtz \
          hklout junk_truncated.mtz <<end-trunc
anomalous yes
nresidue  1049
labout  F=FP SIGF=SIGFP DANO=DANO_sulf SIGDANO=SIGDANO_sulf
end-trunc
 
In this way one gets the well-known output of [http://www.ccp4.ac.uk/html/truncate.html TRUNCATE], and the MTZ file junk_truncated.mtz .
 
== See also ==


The XDSCONV way of obtaining a MTZ file would be just:
[[XDSCONV]] to get the MTZ file directly (i.e. the usual way)
INPUT_FILE=XDS_ASCII.HKL
INCLUDE_RESOLUTION_RANGE=50 1  ! optional
OUTPUT_FILE=temp.hkl  CCP4    FRIEDEL'S_LAW=FALSE
(XDSCONV picks up space group and cell parameters from XDS_ASCII.HKL.) After running [[XDSCONV]] one would then run
f2mtz HKLOUT temp.mtz<F2MTZ.INP
cad HKLIN1 temp.mtz HKLOUT junk_xdsconv.mtz<<EOF
LABIN FILE 1 E1=FP E2=SIGFP E3=DANO E4=SIGDANO
LABOUT FILE 1 E1=FP E2=SIGFP E3=DANO_sulf E4=SIGDANO_sulf
END
EOF

Latest revision as of 13:41, 24 November 2021

How to switch off scaling in CORRECT

If one wants to completely switch scaling off in CORRECT, use 

MINIMUM_I/SIGMA=50 
CORRECTIONS=
NBATCH=1

in XDS.INP. MINIMUM_I/SIGMA=50 prevents the sigmas from being adjusted. This also prevents outlier rejection and geometry refinement. Since the latter may be desired it would be most appropriate to use MINIMUM_I/SIGMA=50 only after Optimization (re-cycling of GXPARM.XDS to XPARM.XDS). Prevention of outlier rejection would be also obtained by using (e.g.) WFAC1=2. NBATCH=1 removes any basic scaling done by CORRECT (as referred to by Krojer and von Delft).

A good option might be to make CORRECT only do MODULATION correction since this is not easily available in SCALA: 

CORRECTIONS= MODULATION

This can also be combined with NBATCH=1.

Using pointless and aimless

pointless produces a multi-record MTZ file (suitable for SCALA/aimless and TRUNCATE) from XDS_ASCII.HKL, or the XSCALE reflection output file (see also "Running Pointless and Scala"). Note that this may use XDS for some or most of the scaling. (see above for how to switch off scaling in XDS.INP, partly or fully). 

pointless -copy xdsin XDS_ASCII.HKL hklout XDS_ASCII.mtz
aimless hklin XDS_ASCII.mtz hklout junk_scaled.mtz | tee aimless.log

Obviously, the aimless run can be modified using suitable options.

See below for how to run TRUNCATE.

If one then needs to edit the batch information in this file, the CCP4 program REBATCH can be used (optional): 

rebatch hklin XDS_ASCII.mtz hklout XDS_ASCII_rebatch.mtz <<end_ip
BATCH ALL START 1001
BATCH ALL PNAME Lysozyme XNAME Hg-Soak DNAME peak
end_ip

sortmtz hklout sortmtz.mtz <<end_ip
H K L M/ISYM BATCH
XDS_ASCII_rebatch.mtz
end_ip

Note: another program to work with those multi-record MTZ files is REINDEX.

Using truncate

#!/bin/csh -f
truncate  hklin  junk_scaled.mtz \
          hklout junk_truncated.mtz <<end-trunc
anomalous yes
nresidue   1049
labout  F=FP SIGF=SIGFP DANO=DANO_sulf SIGDANO=SIGDANO_sulf
end-trunc

In this way one gets the well-known output of TRUNCATE, and the MTZ file junk_truncated.mtz .

See also

XDSCONV to get the MTZ file directly (i.e. the usual way)

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