Hi sir, my image is divided into 4 equal halves:my name is "cc",my 4 blocks are named as 'i1','i2','i3','i4'. i want to access 1st block (i1),which is saved under the name 'o'(i.e o=1).now i need to extract 1st block matrix in image cc

help me sir

Answer 1

[Walter Roberson]

 y = {i1, i2, i3, i4};
 y{o}

[kaavya subramani]

ThankYou sir

[kaavya subramani]

if suppose o=[1 3 4 2....].The elements indicates 1st frame's 1st block matrix,2nd frame's 3rd block matrix,3rd frame's 4th block matrix,4th frame's 2nd block matrix and so on.how to apply "a-b/2" for all frames in for loop(in first iteration a=1st frame,b=2nd frame;in 2nd iteration a=1st frame b=3rd frame.....,like comparsion of all frames with all other frames).how to do using loop sir