Update InputEqn.m

[GinaSierra]

This function uses a segment-based matrix of size (n_segments)x(n_samples) which is constructed in the first call to InputEqn (or when inputParameters changes). Precomputing this matrix provides a decrease in the prediction processing times because then it is not recomputed at each call to InputEqn. However, because it is necessary to find the indexes for each sample, the processing time still is higher than the function using the time-based matrix where instead of looking for the indexes in the matrix, uses the input time as an index.

The figure shows the prediction processing times using the original InputEqn function, the time-based matrix function and the extension of the original function. Although the processing times with the modified segment-based matrix function are higher than the processing times with the time-based matrix function, the modified segment-based matrix function provides a reasonable tradeoff between processing time and memory resources.