Initializing help system before first use

# problem.nlpChgFormula

Purpose
Add or replace a single matrix formula using a parsed or unparsed formula
Topic areas
Problem Modification, Nonlinear
Synopsis
`problem.nlpChgFormula(row, parsed, type, value)`
Arguments

row: constraint | The index of the matrix row for the coefficient.
parsed: int | Integer indicating the whether the token arrays are formatted as internal unparsed ( parsed=0) or internal parsed reverse Polish ( parsed=1).
type: list[int] | Array of token types providing the description and formula for each item.
value: list[float] | Array of values corresponding to the types in type.

Further information
1. If the row already has a nonlinear expression in it, it will be changed into the new formula. If it does not exist, it will be added to the problem.
2. Argument row may contain either xpress.constraint objects or integer indices.
Related topics
problem.nlpGetFormulaStr, problem.nlpAddFormulas, problem.nlpChgFormulaStr, problem.nlpLoadFormulas, problem.nlpGetFormulaRows, problem.nlpGetFormula, problem.nlpDelFormulas
Parent Topic Xpress problem object methods

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