为每一行- R在一列中每次找到最少的两行

I need to find the min value between two rows in my data set, for every row. So this would be, the min value in rows 1&1, 1&2, 2&3 etc. I need the first row of the new array to be 0 (corresponding to the first value of the array) to get a new array of the same length. I need to find the min value between two rows i