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Certainly a negative eigen value is bad - can you attach the data? There may be some obvious problem.. Eleanor On 10 January 2015 at 04:42, Xiao Lei <[log in to unmask]> wrote: > Dear All, > > I tried to convert my x-ray diffraction sca data from HKL200 (.sca file) > to mtz in CCP4 using Scalepack2mtz and it failed, I do not know what should > I supposed to do next to correct the problem, any suggestions are > appreciated. I pasted the message from part of log file below: > > > ANISOTROPY ANALYSIS (using intensities): > > > Eigenvalues: -0.5668 0.1479 0.3584 > > Eigenvalue ratios: -1.5815 0.4128 1.0000 > > ctruncate: Anisotropy correction failed - negative eigenvalue. > > Times: User: 0.4s System: 0.0s Elapsed: 0:00 > > *************************************************************************** > > * Information from CCP4Interface script > > *************************************************************************** > > The program run with command: /Applications/ccp4-6.4.0/bin/ctruncate > -hklin "/LAB/CCP4/TEMP/RelADD_12212014ALS502_3_1_mtz.tmp" -hklout > "/LAB/CCP4/TEMP/RelADD_12212014ALS502_3_3_mtz.tmp" -colin > "/*/*/\[IMEAN,SIGIMEAN\]" -colout P1_12 > > has failed with error message > > ctruncate: Anisotropy correction failed - negative eigenvalue. > > ObjectCache: Leaked 0005 refs to > > *************************************************************************** > > > > #CCP4I TERMINATION STATUS 0 " ctruncate: Anisotropy correction failed - > negative eigenvalue. ObjectCache: Leaked 0005 refs to > > " > > #CCP4I TERMINATION TIME 09 Jan 2015 19:55:50 > > #CCP4I MESSAGE Task failed > > > >