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problem.slpChgCoef

Purpose
Add or change a single matrix coefficient using a parsed or unparsed formula. For a simpler version of this function see problem.nlpChgFormula.
Topic areas
SLP, Problem Modification
Synopsis
problem.slpChgCoef(row, col, factor, parsed, type, value)
Arguments
row 
The index of the matrix row for the coefficient.
col 
The index of the matrix column for the coefficient.
factor 
Address of a double precision variable holding the constant multiplier for the formula. If factor is None, a value of 1.0 will be used.
parsed 
Integer indicating the whether the token arrays are formatted as internal unparsed ( parsed=0) or internal parsed reverse Polish ( parsed=1).
type 
Array of token types providing the description and formula for each item.
value 
Array of values corresponding to the types in type.
Further information
1. If the coefficient already exists as a constant or formula, it will be changed into the new coefficient. If it does not exist, it will be added to the problem.
2. A coefficient is made up of two parts: factor and Formula. factor is a constant multiplier which can be provided in the factor variable. If Xpress NonLinear can identify a constant factor in the Formula, then it will use that as well, to minimize the size of the formula which has to be calculated.
3. Argument row may contain xpress.constraint objects instead of indices.
4. Argument col may contain xpress.var objects instead of indices.
Related topics
problem.nlpGetFormulaStr, problem.nlpAddFormulas, problem.nlpChgFormulaStr, problem.nlpChgFormula, problem.nlpLoadFormulas, problem.nlpGetFormulaRows, problem.nlpGetFormula, problem.nlpDelFormulas

Parent Topic Methods of the class problem

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