However, if you want to zoom to a particular section then the easiest way is to set the axes xlim and ylim . When you do this you should take into account that the xx and t coordinates are the coordinates of the centers of pixels, so you would want to nudge the limits a little to the left or right to include whole pixels.
Note: when you pass x and y values to image() or imagesc() or imshow(), then only the first and last values are paid attention to. If you need a non-linear presentation of an image you need to handle it a different way, such as using pcolor(), or texture mapping your image onto a surface or patch.
