XSLPloadformulas

Purpose

Load non-linear formulas into the SLP problem

Synopsis

int XPRS_CC XSLPloadformulas(XSLPprob Prob, int nFormula, int *RowIndex, int *FormulaStart, int Parsed, int *Type, double *Value);

Arguments

Prob	The current SLP problem.
nFormula	Number of non-linear coefficients to be loaded.
RowIndex	Integer array holding index of row for the coefficient.
FormulaStart	Integer array of length nFormula+1 holding the start position in the arrays Type and Value of the formula for the coefficients. FormulaStart[nFormula] 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.

Example

Assume that the rows and columns of Prob are named Row0, Row1 ..., Col0, Col1 ... The following example adds coefficients representing:
Col2 * Col3 * Col6 ˆ2 into Row1 and
Col2 * Col3 ˆ 2 into Row3.

int RowIndex[3], FormulaStart[4], Type[8];
int n, nFormula;
double Value[8];

RowIndex[0] = 1;
RowIndex[1] = 1;
RowIndex[2] = 3;

n = nFormula = 0;
FormulaStart[nFormula++] = n;
Type[n] = XSLP_COL; Value[n++] = 3;
Type[n++] = XSLP_EOF;

FormulaStart[nFormula++] = n;
Type[n] = XSLP_COL; Value[n++] = 2;
Type[n] = XSLP_COL; Value[n++] = 3;
Type[n] = XSLP_OP;  Value[n++] = XSLP_MULTIPLY;
Type[n] = XSLP_COL; Value[n++] = 6;
Type[n] = XSLP_CON; Value[n++] = 2;
Type[n] = XSLP_OP;  Value[n++] = XSLP_EXPONENT;
Type[n] = XSLP_OP;  Value[n++] = XSLP_MULTIPLY;
Type[n++] = XSLP_EOF;

FormulaStart[nFormula++] = n;
Type[n] = XSLP_COL; Value[n++] = 2;
Type[n] = XSLP_COL; Value[n++] = 3;
Type[n] = XSLP_CON; Value[n++] = 2;
Type[n] = XSLP_OP;  Value[n++] = XSLP_EXPONENT;
Type[n] = XSLP_OP;  Value[n++] = XSLP_MULTIPLY;
Type[n++] = XSLP_EOF;

FormulaStart[nFormula] = n;

XSLPloadformulas(Prob, nFormula, RowIndex, FormulaStart, 1, Type, Value);

Further information

Formula j 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 XSLP_EOF token. If several formulas share the same nonlinear expressions, they can have the same value in FormulaStart. For possible token types and values see the chapter on Xpress NonLinear Formulae.

The XSLPload... functions load items into the SLP problem. Any existing items of the same type are deleted first. The corresponding XSLPadd... functions add or replace items leaving other items of the same type unchanged.

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XSLPloadformulas

XSLPloadformulas