# Unit step function problem

1. Aug 20, 2009

### veralika

if you subtract two delayed unit step functions, is the resultant a unit step function too? what is the value at the last point? 0 or 1? similarly, if you add 2 unit step functions will the magnitude of the resultant funtion be 1 or 2?

2. Aug 20, 2009

### kyiydnlm

not exactly, you need to deal with different segements of you input function separately.

3. Aug 20, 2009

### Born2bwire

Just draw them out and do the additions and subtractions that way. The step function is rather simple so a quick pictoral representation should show you your answer.

4. Sep 1, 2009

### veralika

i still dont get it. could u just tell me that when u subtract 2 unit step functions, will there or will there not be a discontinuity at the last point?

5. Sep 1, 2009

### Born2bwire

What is the last point? This depends completely on what the actual step functions are that you are operating on. Just draw the step functions out on a graph, one above the other and it should be apparent how the resultant plot should look like when you add or subtract the two.