Your code has
%load('changeTemp');
%load('changeHum');
but uses matrices changeTemp and changeHum; you did not provide the .mat files for those in the .zip so we cannot test.
Side note: please change your series of xlsread to instead use
data = readtable('loadData.xls');
demand = data{:,4};
hour = data{:,2};
daynumber = data{:,17};
The reason for this is that the way you called xlsread() can only be used on MS Windows with Excel installed; the replacement code I show here can be used on any system (from roughly R2013b onwards).
