MATLAB: How do i find the 4 element in a matrix

elementfindmatrix

i need help on writing a script that finds the 4 element in a matrix meaning i need the element in the first row in the fourth column

I am required to use the find() function if that helps

eg:

A = randi(45,5,4)
out = A(1,4)

i1 = reshape(1:numel(A),size(A,2),[]).'
out = A(find(i1 == 4))

out = A(i1 == 4)

[~,idx]=setdiff(A,B,'rows');
idx_rows=setdiff(1:size(A,1),idx)

Try this:

a= [1,2,3,4,5] 
b= [-1,-2,-3]
c = a' - b;
c = c(:)'

You get

c =
   2     3     4     5     6     3     4     5     6     7     4     5     6     7     8

in R2016b (I believe) or later that has automatic expansion capability.