You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: SortStack.m
    path of file: ./repos/HDR_Toolbox/source_code/IO_stack
    
    the code of the file until where you have to start completion: function [stack, stack_exposure ] = SortStack( stack, stack_exposure, sorting_type )
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%       [lin_fun, pp] = MitsunagaNayarCRF(stack, stack_exposure, N, nSamples, sampling_strategy)
%
%       This function computes camera response function using Mitsunaga and
%       Nayar method.

    
function [stack, stack_exposure ] = SortStack( stack, stack_exposure, sorting_type )
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%       [lin_fun, pp] = MitsunagaNayarCRF(stack, stack_exposure, N, nSamples, sampling_strategy)
%
%       This function computes camera response function using Mitsunaga and
%       Nayar method.
%
%        Input:
%           -stack: a stack of LDR images. If the stack is a single or
%           double values are assumed to be in [0,1]
%           -stack_exposure: an array containg the exposure time of each
%           image. Time is expressed in second (s)
%           -sorting_type: 'ascend