Is there a faster or more efficient function or method compared to the QUANTIZ function to model non-linear quantizers?

The QUANTIZ function can model non-linear quantizers by including a non-linear partition file. The QUANTIZ function is a linear search based algorithm which means every partition point is compared to each sig input sample to find the corresponding code. Is there another MATLAB function or method with higher performance? (e.g. a function using binary search instead of linear search). I can write my own binary search based function, but I was wondering if one already exists or if there is an even more efficient method. Thanks in advance.