The following program does not currently have any comments. Copy the program to your m-file. Add comments to the code. Every single line of code should be explained with a comment. Also, the function of the script should be explained. load datavals.mat [r,c]=size(datavals); for row = 1:r  runsum=0;  for col=1:c  if datavals(row,col) > 0  runsum = runsum+datavals(row,col);  end  end fprintf('The total sum of positive numbers is %f \n',runsum) end

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Variables and Constant

Constants and variables are widely used in mathematical equations and expressions. They are also commonly found in the domain of programming, where each language has its own way to differentiate between a constant and a variable. Since they have all sorts of applications, knowing their differences is a good place to start.