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# XPRMgetdual

Purpose
Get the dual value of a linear constraint.
Synopsis
`double XPRMgetdual(XPRMmodel model, XPRMlinctr ctr);`
Arguments

model | Reference to a model
ctr | Reference to a linear constraint

Return value
Dual value or 0.
Further information
This function returns the dual value of a given linear constraint if the problem has been solved successfully and the constraint is contained in the problem (otherwise 0).
Related topics
XPRMgetact, XPRMgetcsol, XPRMgetslack.
Parent Topic Post processing interface

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