scaling the colorbar of the plot

I want to scale the color bar to maximum and minimum values? which function should I use caxis or clim? and what is the difference between them

Answer 1

[Azzi Abdelmalek]

set(gca,'ylim',[min_yval max_yval]),  %for  y axis

[Jack_111]

I do meshing of the figure mesh(x,y,z) and then color bar but I want to scale this colorbar