XSLPaddformulas
XSLPaddformulas |
int XPRS_CC XSLPaddformulas(XSLPprob Prob, int nFormulas, int *RowIndex, int *FormulaStart, int Parsed, int *Type, double *Value);
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Prob
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The current SLP problem.
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nFormulas
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Number of non-linear coefficients to be added.
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RowIndex
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Integer array holding index of row for the coefficient.
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FormulaStart
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Integer array of length
nFormulas+1 holding the start position in the arrays
Type and
Value of the formula for the coefficients.
FormulaStart[nFormulas] should be set to the next position after the end of the last formula.
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Parsed
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Integer indicating whether the token arrays are formatted as internal unparsed (
Parsed=0) or internal parsed reverse Polish (
Parsed=1).
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Type
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Array of token types providing the formula for each coefficient.
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Value
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Array of values corresponding to the types in
Type.
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Col2 * Col3 * Col6 ˆ2 into Row1 and
Col2 * Col3 ˆ 2 into Row3.
int RowIndex[3], FormulaStart[4], Type[8]; int n, nFormulas; double Value[8]; RowIndex[0] = 1; RowIndex[1] = 1; RowIndex[2] = 3; n = nFormulas = 0; FormulaStart[nFormulas++] = n; Type[n] = XSLP_COL; Value[n++] = 3; Type[n++] = XSLP_EOF; FormulaStart[nFormulas++] = 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[nFormulas++] = 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[nFormulas] = n; XSLPaddformulas(Prob, nFormulas, RowIndex, FormulaStart, 1 /* reversed Polish */, Type, Value);
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 XSLP_EOF token. If several rows share the same nonlinear expression, they can have the same value in FormulaStart. For possible token types and values see the chapter on Xpress NonLinear Formulae.
The XSLPadd... functions load additional items into the SLP problem. The corresponding XSLPload... functions delete any existing items first.
The behaviour for existing formulas is additive: the formula defined in the parameters are added to any existing nonlinear expressions in the row. However, due to performance considerations, such duplications should be avoided when possible.