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Document file_io.m, containing four functions
(1) read_pdbca: read protein c-Alpha Atom coordinates;
Enter the parameter file to a file name string, output parameters for each Atomic coordinate value of x, the format is a two-dimensional array of 3*n.
(2) read_pdbbb: read the protein backbone atoms coordinates;
Enter the parameter file to a file name string, the output parameter x as main chain atoms coordinate values, the format is a two-dimensional array of 3*n.
(3) read_pdbaa: read the Atomic coordinates of protein;
Input parameter file is the file name string, the output parameter x as rectangular coordinates of all the atoms, two-dimensional array format is 3*n.
(4) read_pdbseq: read the protein sequence
Enter the parameter file to a file name string, output parameters are s for protein sequences c character arrays, two-dimensional c
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