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# XPRSaddsets, XPRSaddsets64

Purpose
Allows sets to be added to the problem after passing it to the Optimizer using the input routines.
Topic areas
Problem Creation, MIP Entities
Synopsis
`int XPRS_CC XPRSaddsets(XPRSprob prob, int nsets, int nelems, const char settype[], const int start[], const int colind[], const double refval[]);`
``
`int XPRS_CC XPRSaddsets64(XPRSprob prob, int nsets, XPRSint64 nelems, const char settype[], const XPRSint64 start[], const int colind[], const double refval[]);`
Arguments

prob | The current problem.
nsets | Number of new sets.
nelems | Number of new nonzeros in the added sets.
settype | Character array of length nsets containing the set types:
1 | indicates a SOS1;
2 | indicates a SOS2;
start | Integer array of length nsets containing the offsets in the colind and refval arrays of the start of the elements for each set.
colind | Integer array of length nelems containing the (contiguous) column indices for the elements in each set.
refval | Double array of length nelems containing the (contiguous) reference values. These define the order for SOS2 constraints and may be used in branching for both types. Within a set, no two elements can have the same reference values and reference values must differ by at least SOSREFTOL (relative difference).

Further information
1. Reference values must be sufficiently distinct (see SOSREFTOL).
2. This function cannot be called while the current problem is being solved or when it is in an interrupted state. Use XPRSpostsolve to restore the problem to a non-solving state.
Related topics
XPRSdelsets.
Parent Topic Console and Library Functions

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