Difference between GLP_DUAL and GLP_DUALP in GLPK method

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I will really appreciate if any one help me to know the difference between GLP_DUAL and GLP_DUALP in GLPK method.

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vitaut On

GLP_DUALP falls back to primal simplex if dual fails, quoting the source:

#define GLP_DUALP          2  /* use dual; if it fails, use primal */
#define GLP_DUAL           3  /* use dual simplex */