Bar plot for two matrices together

I have two matrices ww and si. I want to make a bar plot with this two. For each year (x-axis) I need to show 2 bars – one ww and one si. si need to be reversed, as si in negative y axis. So that flipping the si to show the same trends of the bars.

[KSSV]

bar(rand,'r')
hold on
bar(-rand,'b')

[Joydeb Saha]

I want to make something like this. See the image attached. Attached the matrices also.

Answer 1

[Stephan]

https://de.mathworks.com/help/matlab/ref/bar.html?searchHighlight=bar&s_tid=srchtitle_bar_1#bug9u7m-1

Every column stands for a bar, every line stands for a x-value