How to do for loop for long-term of satellite data?

Hi every body,

I have long-term of satellite data (16 years) I want to create a loop to read and do some calculate for all images. I did a for loop my the output only for the first image. Here is the code:

if true
y1=-89.5:1.0:89.5;
x1=-179.5:1.0:179.5;
cd E:\GRACE_Files_20022016\GRACE_TIFF
F_read=dir('*.tif');
for i=1:length(F_read);
  grace{i}=F_read(i).name;
Grace2{i} = imread(grace{i});
Grace2{i}= im2double(Grace2{i});
A{i} = Grace2{i}(1:end,1:183);
B{i} = Grace2{i}(1:end,184:end);
GRACE{i} = [B,A];
GRACE{i}=GRACE{i}(y1<= 31.91 & y1>= 30.49,x1<=47.85  & x1>= 46.01);
GRACE{i}(GRACE{i}<-99.999)=NaN;
end
end
Thank you in advance

Reyadh

[KSSV]

Check F_read, what is it length? It shall be a structure. Check did it cover all the images of the directory.