if statement - Matlab simple matrix manip -

i'm new matlab , want achieve simple operation : have 792 x 1046 uint8 matrix called mg , want convert cells values (from 0 255) values between 1 , 4 (1,2,3,4) in new matrix called mgc accordingly simple conditions.

strangely, new matrix filled 1s , 2s not 3s or 4s...

here code :

[x,y]=size(mg); mgc = zeros(x,y);  i=1:x     j=1:y         if (mg(i,j)<=100)              mgc(i,j)=1;         elseif (100<mg(i,j)<=110)              mgc(i,j)=2;         elseif (110<mg(i,j)<=120)              mgc(i,j)=3;         else             mgc(i,j)=4;         end     end end 

if me solve stupid issue, great ! thx

you shouldn't use expressions such 100<mg(i,j)<=110 in matlab. instead, use 100<mg(i,j) && mg(i,j)<=110.

at moment, matlab evaluating expression 100<mg(i,j)<=110 (100<mg(i,j))<=110. (100<mg(i,j)) going either 1 or 0 (true or false), , therefore <=110. never gets past second else, , array either 1 or 2.

---

edit: although answer explains specific issue you're having, should instead using logical indexing, more efficient double loop (and more idiomatic in matlab). see answers @excaza or @benoit_11 examples of that).