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# problem.slpChgDeltaType

Purpose
Changes the type of the delta assigned to a nonlinear variable
Topic areas
SLP, Problem Modification, Nonlinear
Synopsis
`problem.slpChgDeltaType(varind, deltatypes, values)`
Arguments

varind | Indices of the variables to change the deltas for.
deltatypes | Type of the delta variable:
0 (xpress.constants.SLPDELTA_CONT) | Differentiable variable, default.
1 (xpress.constants.SLPDELTA_SEMICONT) | Variable where a minimum perturbation size given in values may be required before a significant change in the problem is achieved.
2 (xpress.constants.SLPDELTA_INTEGER) | Variable defined over the grid size given in values.
3 (xpress.constants.SLPDELTA_EXPLORE) | Variable where a meaningful step size should automatically be detected, with an upper limit given in values.
values | Grid or minimum step sizes for the variables.

Further information
1. Changing the delta type of a variables makes the variable nonlinear.
2. Argument varind may contain xpress.var objects instead of indices.
Related topics
SLPSEMICONTDELTAS, SLPINTEGERDELTAS, SLPEXPLOREDELTAS
Parent Topic Methods of the class problem

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