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The same old problem... your mind is set to indeces starting at 1 not 0. See
the error below, my comments are hash-marked:

for ( i =0; i < (rows(invec)-1); ++i )

####  so i goes from 1 to 9 if you have 10 rows #####

	{
		if ( i == 0 )
		{
		print("i = ",i,"\n");
		outvec[i][0] = invec[i+1][0] + invec[i][0];

####	Here, you will get invec[ ### 10 ### ][0] which is out of range #####

 		}


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