Initializing help system before first use

problem.nlpchgformula

Purpose
Add or replace a single matrix formula using a parsed or unparsed formula
Synopsis
problem.nlpchgformula(row, parsed, type, value)
Arguments
row 
The row (i.e. xpress.constraint object, index, or name) for the formula.
parsed 
Boolean indicating whether the token arrays are formatted as internal unparsed ( parsed=False) or internal parsed reverse Polish ( parsed=True).
type 
Array of token types providing the formula for each coefficient.
value 
Array of values corresponding to the types in Type.
Example
Assuming that the columns of the matrix are named Col1, Col2, etc, the following example puts the formula sin(Col1) into the coefficient in row 1. 
iCol1 = problem.getIndex(Col1)
    type =  [xp.tok_ifun, xp.tok_col, xp.tok_rb, xp.tok_eof]
    value = [xp.ifun_sin, iCol1,      0,         0]
    problem.nlpchgformula(1, False, type, value)
The formula is written in unparsed form ( parsed=False) and so it is provided as tokens in the same order as they would appear if the formula were written in character form.
Further information
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.
Related topics
problem.nlpgetformulastr, problem.nlpchgformulastr, problem.nlpgetformula.

Parent Topic Xpress problem methods

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