pls help me urgent!!! figure showing for a image vector

for a simply example like below:

I = rgb2gray(imread('1231.png'));
g=find(I<180);
ft=g*0.9
sx=find(I(g)>ft);

now i nid to show a figure for sx, anyone can teach me?

[Walter Roberson]

http://www.mathworks.com/matlabcentral/answers/29922-why-your-question-is-not-urgent-or-an-emergency