[Home](./index.md) > [rc-js-util](./rc-js-util.md) > [IReadonlyMat2](./rc-js-util.ireadonlymat2.md) ## IReadonlyMat2 interface [Mat2](./rc-js-util.mat2.md). **Signature:** ```typescript export interface IReadonlyMat2 extends TPickExcept>, "update" | "setValueAt" | "setRow" | "copyFromBuffer" | "scalarMultiply" | "scalarAdd" | TTypedArrayTupleMutativeMethods> ``` **Extends:** [TPickExcept](./rc-js-util.tpickexcept.md)<Readonly<[Mat2](./rc-js-util.mat2.md)<TArray>>, "update" \| "setValueAt" \| "setRow" \| "copyFromBuffer" \| "scalarMultiply" \| "scalarAdd" \| [TTypedArrayTupleMutativeMethods](./rc-js-util.ttypedarraytuplemutativemethods.md)>