If you give Pointless Fs, it squares them to Is (not correct if the Fs have 
been derived from the truncate procedure, but not too bad). It will then give 
you a comparison. If you give the two datasets to Pointless, labelling them as 
different datasets, you can use Aimless to compare them

But as Andrew said, the appropriate CCP4 program is Scaleit: it’s old but still 
works and gives lots of statistics 

Phil

Sent from my iPhone

> On 26 Jul 2022, at 09:37, Andrew Leslie - MRC LMB <and...@mrc-lmb.cam.ac.uk> 
> wrote:
> 
> I think that POINTLESS works with intensities rather than structure factors 
> (I’m not sure if this can be changed). Also, SCALEIT gives a much more 
> detailed breakdown (R factors as a function of resolution and differences in 
> terms of sigmas etc) than POINTLESS WILL.
> 
> Cheers,
> 
> Andrew
> 
>> On 26 Jul 2022, at 09:24, LEGRAND Pierre 
>> <pierre.legr...@synchrotron-soleil.fr> wrote:
>> 
>> Hello Mirek,
>> 
>> A very quick approach for that is offered by pointless:
>> 
>> pointless HKLREF 1_1_aimless.mtz  HKLIN 2_1_aimless.mtz
>> or
>> pointless HKLREF 1_1_aimless.mtz  XDSIN XDS_ASCII.HK
>> 
>> You will obtain a table looking like that, taking into account to possible 
>> reindexing:
>> 
>> Alternative indexing scores relative to reference
>>        Alternative reindexing        Lklhd      CC     R(E^2)    Number 
>> Cell_deviation
>>  1              [h,k,l]              0.993    0.962    0.118     19150      
>> 0.08
>>  2              [-k,h,l]             0.007    0.078    0.512     19150      
>> 0.87
>> 
>> 
>> Best wishes,
>> 
>> Pierre Legrand
>> PROXIMA-1 Beamline
>> Synchrotron SOLEIL
>> 
>> De: "Nicolas Foos" <nicf...@embl.fr>
>> À: CCP4BB@JISCMAIL.AC.UK
>> Envoyé: Mardi 26 Juillet 2022 08:36:35
>> Objet: Re: [ccp4bb] Comparing two datasets
>> 
>> Hi Mirek, 
>> 
>> I am pretty sure XSCALE will do that for you : 
>> https://xds.mr.mpg.de/html_doc/xscale_program.html
>> 
>> If not, maybe have a look on SHELXC in SIR mode. 
>> 
>> Hope this help. 
>> 
>> Nicolas
>> 
>> On 25/07/2022 21:52, Cygler, Miroslaw wrote:
>> Hi,
>> I would like to calculate the R-merge for Fs from two datasets processed 
>> from two different crystals. Tried to use Blend but got the message that 
>> Blend requires R. Downloaded R but do not know how to tell CCP4 where it is 
>> located on my Mac. Is there another program that would take two mtg files 
>> and merge the Fs?
>> Any help would be greatly appreciated. 
>> 
>> 
>> Mirek
>> 
>> 
>> 
>> 
>> 
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>> -- 
>> Nicolas Foos PhD - ARISE fellow
>> https://orcid.org/0000-0003-2331-8399
>>    
>> EMBL Grenoble, McCarthy Team
>> 71 av. des Martyrs, 
>> 38000 Grenoble FRANCE
>>    
>> +33 4 57 42 84 67
>> 
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> 
> 
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