XSLPparsecformula
XSLPparsecformula |
Purpose
Parse a formula written as a character string into internal parsed (reverse Polish) format
Synopsis
int XPRS_CC XSLPparsecformula(XSLPprob Prob, char *Formula, int *nToken, int *Type, double *Value);
Arguments
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Prob
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The current SLP problem.
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Formula
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Character string containing the formula, written in the same free-format style as used in formulae in Extended MPS format, with spaces separating tokens.
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nToken
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Address of an integer to receive the number of tokens in the parsed formula (not counting the terminating
XSLP_EOF token). May be
NULL if not required.
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Type
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Array of token types providing the parsed formula.
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Value
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Array of values corresponding to the types in
Type.
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Example
Assuming that
x and
y are already defined as columns, the following example converts the formula "sin(x+y)" into internal parsed format, and then writes it out as a sequence of tokens.
int n, Type[20];
double Value[20];
XSLPparsecformula(Prob, "sin ( x + y )", NULL, Type, Value);
printf("\n");
for (n=0;Type[n] != XSLP_EOF;n++) {
XSLPitemname(Prob, Type[n], Value[n], Buffer);
printf(" %s", Buffer);
}
Further information
Tokens are identified by name, so any columns or user functions which appear in the formula must already have been defined. Unidentified tokens will appear as type XSLP_UNKNOWN.
Related topics