what is the output of the matlab function round(-2.1)? in matlab

The output of the function round(-2.1) in Matlab is -2.

To verify this, you can simply enter round(-2.1) in the command window in Matlab and it will return -2. The round function rounds a number to the nearest integer. In this case, -2.1 is closer to -2 than -3, so it is rounded down to -2.