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sysBiolAlg_mtfClass.R 13.91 KiB
# sysBiolAlg_mtfClass.R
# FBA and friends with R.
#
# Copyright (C) 2010-2014 Gabriel Gelius-Dietrich, Dpt. for Bioinformatics,
# Institute for Informatics, Heinrich-Heine-University, Duesseldorf, Germany.
# All right reserved.
# Email: geliudie@uni-duesseldorf.de
#
# This file is part of sybil.
#
# Sybil is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Sybil is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with sybil. If not, see <http://www.gnu.org/licenses/>.
#------------------------------------------------------------------------------#
# definition of the class sysBiolAlg_mtf #
#------------------------------------------------------------------------------#
setClass(Class = "sysBiolAlg_mtf",
representation(
maxobj = "numeric"
),
contains = "sysBiolAlg"
)
#------------------------------------------------------------------------------#
# default constructor #
#------------------------------------------------------------------------------#
# contructor for class sysBiolAlg_mtf
setMethod(f = "initialize",
signature = "sysBiolAlg_mtf",
definition = function(.Object,
model,
wtobj = NULL,
react = NULL, lb = NULL, ub = NULL,
costcoefbw = NULL,
costcoeffw = NULL,
lpdir = "min",
absMAX = SYBIL_SETTINGS("MAXIMUM"),
useNames = SYBIL_SETTINGS("USE_NAMES"),
cnames = NULL,
rnames = NULL,
pname = NULL,
scaling = NULL,
writeProbToFileName = NULL, ...) {
if ( ! missing(model) ) {
if (is.null(wtobj)) {
tmp <- .generateWT(model, react, lb, ub, ...)
wtobj <- tmp[["obj"]]
}
stopifnot(is(model, "modelorg"),
is(wtobj, "numeric"),
is(absMAX, "numeric"))
stopifnot(lpdir %in% c("min", "max"))
# If wtobj is longer than 1, mtf algorithm has to run several
# times. In that case, wtobj is not written in the problem
# object, it is written separately (maxobj) and used for
# each iteration.
if (length(wtobj) > 1) {
maxobj <- wtobj
currmo <- 0
}
else {
maxobj <- NULL
currmo <- wtobj[1]
}
# the problem: minimize:
#
# | | |
# S | 0 | 0 | = b
# | | |
# -------------------------
# | | |
# 1 | 1 | 0 | >= 0
# | | |
# -------------------------
# | | |
# -1 | 0 | 1 | >= 0
# | | |
# -------------------------
# c_wt | 0 | 0 | >= c^T * v_wt
# | | |
# lb wt_lb| 0 | 0 |
# ub wt_ub|10000 |10000 |
# | | |
# obj 0 | 1 | 1 |
# NOTE: if lpdir == "max" the 2nd and 3rd block
# will be <= instead of >= and signs change.
# ---------------------------------------------
# problem dimensions
# ---------------------------------------------
nc <- react_num(model)
nr <- met_num(model)
nCols <- 3*nc
nRows <- nr + 2*nc + 1
# ---------------------------------------------
# constraint matrix
# ---------------------------------------------
# the initial matrix dimensions
LHS <- Matrix::Matrix(0,
nrow = nRows,
ncol = nCols,
sparse = TRUE)
# rows for the mutant strain
LHS[1:nr,1:nc] <- S(model)
# location of the mutant strain
fi <- c(1:nc)
# rows for the delta match matrix
if(lpdir=="min"){
diag(LHS[(nr+1) :(nr+nc) ,1 :nc ]) <- 1
diag(LHS[(nr+1) :(nr+nc) ,(nc+1) :(2*nc)]) <- 1 diag(LHS[(nr+nc+1):(nr+2*nc),1 :nc ]) <- -1
diag(LHS[(nr+nc+1):(nr+2*nc),(2*nc+1):(3*nc)]) <- 1
}else{
diag(LHS[(nr+1) :(nr+nc) ,1 :nc ]) <- 1
diag(LHS[(nr+1) :(nr+nc) ,(nc+1) :(2*nc)]) <- -1
diag(LHS[(nr+nc+1):(nr+2*nc),1 :nc ]) <- -1
diag(LHS[(nr+nc+1):(nr+2*nc),(2*nc+1):(3*nc)]) <- 1
}
# fix the value of the objective function
LHS[(nr+2*nc+1),1:nc] <- obj_coef(model)
# ---------------------------------------------
# columns
# ---------------------------------------------
lower <- c(lowbnd(model), rep(0, 2*nc))
upper <- c(uppbnd(model), rep(absMAX, 2*nc))
# ---------------------------------------------
# rows
# ---------------------------------------------
#rlower <- c(rhs(model), rep(0, 2*nc), currmo)
#rupper <- c(rhs(model), rep(absMAX, 2*nc + 1))
rlower <- c(rep(0, nr), rep(0, 2*nc), currmo)
rupper <- c(rep(0, nr), rep(absMAX, 2*nc + 1))
if(lpdir == "min"){
rtype <- c(rep("E", nr), rep("L", 2*nc), "L")
}else{
rtype <- c(rep("E", nr), rep("U", 2*nc), "L")
}
# ---------------------------------------------
# objective function
# ---------------------------------------------
if (is.null(costcoeffw)) {
fw <- rep(1, nc)
}
else {
stopifnot(is(costcoeffw, "numeric"),
(length(costcoeffw) == nc))
fw <- costcoeffw
}
if (is.null(costcoefbw)) {
bw <- fw
}
else {
stopifnot(is(costcoefbw, "numeric"),
(length(costcoefbw) == nc))
bw <- costcoefbw
}
cobj <- c(rep(0, nc), bw, fw)
# ---------------------------------------------
# row and column names for the problem object
# ---------------------------------------------
if (isTRUE(useNames)) {
if (is.null(cnames)) {
cn <- c(react_id(model),
paste("bw", react_id(model), sep = "_"), paste("fw", react_id(model), sep = "_")
)
colNames <- .makeLPcompatible(cn, prefix = "x")
}
else {
stopifnot(is(cnames, "character"),
length(cnames) == nCols)
colNames <- cnames
}
if (is.null(rnames)) {
rn <- c(met_id(model),
paste("bw", 1:nc, sep = "_"),
paste("fw", 1:nc, sep = "_"),
"obj_wt"
)
rowNames <- .makeLPcompatible(rn, prefix = "r")
}
else {
stopifnot(is(rnames, "character"),
length(rnames) == nRows)
rowNames <- rnames
}
if (is.null(pname)) {
probName <- .makeLPcompatible(
paste("MTF", mod_id(model), sep = "_"),
prefix = "")
}
else {
stopifnot(is(pname, "character"),
length(pname) == 1)
probName <- pname
}
}
else {
colNames <- NULL
rowNames <- NULL
probName <- NULL
}
# ---------------------------------------------
# build problem object
# ---------------------------------------------
.Object <- callNextMethod(.Object,
sbalg = "mtf",
pType = "lp",
scaling = scaling,
fi = fi,
nCols = nCols,
nRows = nRows,
mat = LHS,
ub = upper,
lb = lower,
obj = cobj,
rlb = rlower,
rub = rupper,
rtype = rtype,
lpdir = lpdir,
ctype = NULL,
cnames = colNames,
rnames = rowNames,
pname = probName,
algPar = list("wtobj" = wtobj,
"costcoefbw" = bw,
"costcoeffw" = fw),
...)
.Object@maxobj <- as.numeric(maxobj)
if (!is.null(writeProbToFileName)) {
writeProb(problem(.Object),
fname = as.character(writeProbToFileName))
}
#
# # ---------------------------------------------
# # build problem object
# # ---------------------------------------------
#
# lp <- optObj(solver = solver, method = method)
# lp <- initProb(lp, nrows = nRows, ncols = nCols)
#
# # ---------------------------------------------
# # set control parameters
# # ---------------------------------------------
#
# if (!any(is.na(solverParm))) {
# setSolverParm(lp, solverParm)
# }
#
#
# loadLPprob(lp,
# nCols = nCols,
# nRows = nRows,
# mat = LHS,
# ub = upper,
# lb = lower,
# obj = cobj,
# rlb = rlower,
# rub = rupper,
# rtype = rtype,
# lpdir = "min"
# )
#
# if (!is.null(scaling)) {
# scaleProb(lp, scaling)
# }
#
# .Object@problem <- lp
# .Object@algorithm <- "mtf"
# .Object@nr <- as.integer(nRows)
# .Object@nc <- as.integer(nCols)
# .Object@fldind <- as.integer(fi)
# validObject(.Object)
}
return(.Object)
}
)
#------------------------------------------------------------------------------#
# other methods #
#------------------------------------------------------------------------------#
setMethod("changeMaxObj", signature(object = "sysBiolAlg_mtf"),
function(object, j) {
if (!is.null(object@maxobj)) {
changeRowsBnds(problem(object), i = nr(object),
lb = object@maxobj[j], ub = SYBIL_SETTINGS("MAXIMUM"))
}
return(invisible(TRUE))
}
)