Nonterminating transformations and summations associated with some q-Mellin--Barnes integrals

In many cases one may encounter an integral which is of $q$-Mellin--Barnes type. These integrals are easily evaluated using theorems which have a long history dating back to Slater, Askey, Gasper, Rahman and others. We derive some interesting $q$-Mellin--Barnes integrals and using them we derive transformation and summation formulas for nonterminating basic hypergeometric functions. The cases which we treat include ratios of theta functions, the Askey--Wilson moments, nonterminating well-poised ${}_3ϕ_2$, nonterminating very-well-poised ${}_5W_4$, ${}_8W_7$, products of two nonterminating ${}_2ϕ_1$'s, square of a nonterminating well-poised ${}_2ϕ_1$, and nonterminating ${}_{12}W_{11}$ and ${}_{10}W_9$.

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