resolving the error Subscript indices must either be real positive integers or logicals when using squeeze function

I am new to matlab.I am using it interactively select pixels from an image.I am using imagesc to display my image,ginput to select a pixel and retrieve its coordinate values.but i am getting an error in this line of code-

p1=squeeze(I(y,x,:));

I am using envihdrread to read the header info and envidataread to read the image data.And then i am using the following code:

s =I(:,:,80); imagesc(s) [x y]=ginput p1=squeeze(I(y,x,:));

This is giving me an error:-

Subscript indices must either be real positive integers or logicals

please help me to sort it out.

Thank you!!!!!!!

Ekta Shah

Answer 1

[Walter Roberson]

ginput() returns data units, not necessarily integer coordinates.

http://www.mathworks.com/help/techdoc/ref/ginput.html

Another consideration is that for image() and imagesc(), positions are measured by the center of the pixels.