Bar graphed 'stack' option

Hi, I have a problem when plotting a bar graph using the 'stack' option. The stacked bar graph I get do not give the right sum of the elements in the matrix when the elements are of negative values. I attached a simple matrix here A=[8 -1 -4 -2 3; 2 -5 -1 -2 -7]

The summation of the first row= 4 The summation of the second row= -13 The command >>bar(A,'stack) does not display the right summation. Can anyone please explain why is that so?

Thank you in advance.

Answer 1

[Sean de Wolski]

If you want to see the sum, then you'll need to feed the sum of A into bar()

bar(sum(A,2),'stacked')

Answer 2

[nor]

Sorry to bother everyone. I have actually figures it out. The way the stacked bar is display is actually quite confusing.