MRC Home MRC and Maps

Documentation Links to MRC software required for maplib

  • MRC MAPS DOC Some useful documentation for IMAGE Analysis and file format Programs & Routines

    Source code Links to MRC software required for maplib

  • CCCPLIB utility subroutine library
  • DISKIO low-level input/output subroutine library
  • IMSUBS2000 Subroutine Library for MRC map file handling
  • MAP HEADER COMMONS FORTRAN Common block include file for mrc maps
  • LIBRARY.C low-level C subroutine library
  • LIBRARY HEADER low-level C subroutine library include file
  • SUBS Dummy routines to match ccp4 calls
  • UNIX library routines for system interactions

  • HEADER Simple example program for reading a the header from a mrc map

  • Makefile sgi

    Testing MRC map library with header

    Get a sample MRC map HERE (The 3d map is a low resolution map of the core of Hepatitus B (T.Crowther)).
    Get a sample MRC STACK map HERE (The stack is from some raw data of KHMT).

    (Thanks to Jude Smith at the MRC-LMB for supplying the software and maps).
    Jude Smith

    Make, mrclib.a and header then run as
    setenv IN sample.mrc
    header

    The setenv is required if the complete ccp4 package is NOT installed, else
    use:
    header IN sample.mrc

    The output should match that in
    header_sample_output
    i.e. it gives

    Number of columns, rows, sections ........     55    55    55
Map mode .................................      2
Start points on columns, rows, sections ..      0     0     0
Grid sampling on x, y, z .................     55    55    55
Cell axes ................................      55.00     55.00     55.00
Cell angles ..............................      90.00     90.00     90.00
Fast, medium, slow axes ..................      X     Y     Z
Minimum density ..........................          -39.314189910889
Maximum density ..........................           59.195320129395
Mean density .............................            2.695798873901
Origin ...................................       0.00      0.00      0.00
RMS deviation ............................            0.000000000000
Space group, # bytes symmetry ............      0     0
Number of titles .........................      3

    This map is a 55 section map and using the ccp4 procedure mapdump
    compiled with the ccp4 original code, ie. (see CCP4 MAPS ) gives for section 0 the output from
    mapdump mapin sample.mrc
    0 0 1
    GO
    gives for example the header

    Number of columns, rows, sections ...............   55   55   55
Map mode ........................................    2
Start and stop points on columns, rows, sections     0   54    0   54    0   54
Grid sampling on x, y, z ........................   55   55   55
Cell dimensions .................................  55.00  55.00  55.00  90.00  90.00  90.00
Fast, medium, slow axes .........................    X    Y    Z
Minimum density .................................   -39.31419
Maximum density .................................    59.19532
Mean density ....................................     2.69580
Rms deviation from mean density .................     0.00
Space-group .....................................    1
Number of titles ................................    3

    Pick up entire local copy of required files and test map

    mrc_maps.tar.gz

    Enquires to Richard Newman
    Last modified: Mon Jul 23 11:58:42 BST 2001