extrProtPSSMAcc: Profile-based protein representation derived by PSSM...
In wind22zhu/BioMedR: Generating Various Molecular Representations for Chemicals, Proteins, DNAs, RNAs and Their Interactions

Description Usage Arguments Details Value Author(s) References See Also Examples

Profile-based protein representation derived by PSSM (Position-Specific Scoring Matrix) and auto cross covariance

1	extrProtPSSMAcc(pssmmat, lag)

`pssmmat`	The PSSM computed by `extrProtPSSM`.
`lag`	The lag parameter. Must be less than the number of amino acids in the sequence (i.e. the number of columns in the PSSM matrix).

This function calculates the feature vector based on the PSSM by running PSI-Blast and auto cross covariance tranformation.

A length lag * 20^2 named numeric vector, the element names are derived by the amino acid name abbreviation (crossed amino acid name abbreviation) and lag index.

Min-feng Zhu <wind2zhu@163.com>, Nan Xiao <http://r2s.name>

Wold, S., Jonsson, J., Sj\"orstr\"om, M., Sandberg, M., & R\"annar, S. (1993). DNA and peptide sequences and chemical processes multivariately modelled by principal component analysis and partial least-squares projections to latent structures. Analytica chimica acta, 277(2), 239–253.

extrProtPSSM extrProtPSSMFeature

x = readFASTA(system.file('protseq/P00750.fasta', package = 'BioMedR'))[[1]]
dbpath = tempfile('tempdb', fileext = '.fasta')
invisible(file.copy(from = system.file('protseq/Plasminogen.fasta', 
package = 'BioMedR'), to = dbpath))
pssmmat = extrProtPSSM(seq = x, database.path = dbpath)
pssmacc = extrProtPSSMAcc(pssmmat, lag = 3)
tail(pssmacc)