plotting positive values blue and negative values red of a grouped bar plot

Hello,

I have a dissimilar length of data: one 18x1 and the other 72x1 and I want to plot a horizontal grouped bar plot of my data. data values range from positive and negative values. I have tried foll. way to plot, however, not sure how to show positive part as red and negative part as blue.

L_x = length(x);
L_y = length(y);

h = nan(max(L_x,L_y),2)
h(1:L_x,1) = x;
h(1:L_y,2) = y;

H = h';
Z = [1,2]
barh(Z,H,'grouped');
set(gca, 'CLim', [-30 30]);

[Poulomi Ganguli]

I solved the problem by superimposing negative & positive part of data together.