Finding a position of a element in a matrix

I have a matrix a=[1 2 3 4 5 10;2 3 5 6 1 12;2 6 4 5 7 16;10 2 1 4 5 20;2 3 1 4 9 12]

I want to find out the minimum value postion of this matrix in 2nd row from 1st to 3rd column

I have written this code

[i1,j1]=find(a(2,1:6)==min(a(2,1:3)))

but instead of giving 2nd row 1st column as the minimum value postion, it is showing the result like this

i1 =

1

j1 =

1