Initializing help system before first use

problem.slpAddCoefs

Purpose
Add non-linear coefficients to the SLP problem. For a simpler version of this function see problem.nlpAddFormulas.
Topic areas
SLP, Problem Modification
Synopsis
problem.slpAddCoefs(rowind, colind, factor, formulastart, parsed, type, value)
Arguments
rowind 
Integer array holding index of row for the coefficient.
colind 
Integer array holding index of column for the coefficient.
factor 
Double array holding factor by which the formula is scaled. If this is None, then a value of 1.0 will be used.
formulastart 
Integer array holding the start position in the arrays type and value of the formula for the coefficients. The last element should be set to the next position after the end of the last formula.
parsed 
Integer indicating 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 formula for each coefficient.
value 
Array of values corresponding to the types in type.
Further information
1. The j th coefficient is made up of two parts: factor and Formula. factor is a constant multiplier, which can be provided in the factor array. If Xpress NonLinear can identify a constant factor in Formula, then it will use that as well, to minimize the size of the formula which has to be calculated. Formula is made up of a list of tokens in type and value starting at formulastart[j]. The tokens follow the rules for parsed or unparsed formulae as indicated by the setting of parsed. The formula must be terminated with an xpress.constants.TOK_EOF token. If several coefficients share the same formula, they can have the same value in formulastart. For possible token types and values see the NonLinear reference manual.
2. The add functions load additional items into the SLP problem. The corresponding load functions delete any existing items first.
3. The behaviour for existing coefficients is additive: the formula defined in the parameters are added to any existing formula coefficients. However, due to performance considerations, such duplications should be avoided when possible.
4. Argument rowind may contain xpress.constraint objects instead of indices.
5. Argument colind 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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