Initializing help system before first use

problem.nlpChgFormulaStr

Purpose
Add or replace a single matrix formula using a character string for the formula.
Topic area
Problem Modification
Synopsis
problem.nlpChgFormulaStr(row, formula)
Arguments
row 
The index of the matrix row for the coefficient.
formula 
Character string holding the formula with the tokens separated by spaces.
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. This function can only be used if all the operands in the formula can be correctly identified as constants, existing columns, character variables or functions. Therefore, if a formula refers to a new column, that new item must be added to the Xpress NonLinear problem first.
3. Argument row may contain xpress.constraint objects instead of indices.
Related topics
problem.nlpGetFormulaStr, problem.nlpAddFormulas, problem.nlpChgFormula, problem.nlpLoadFormulas, problem.nlpGetFormulaRows, problem.nlpGetFormula, problem.nlpDelFormulas

Parent Topic Methods of the class problem

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