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# Unit Step Function Curve- Maths watch

1. Hello, Does anyone know what a unit step function curve looks like. The question is

the unit step function is defined by
u(t) = {1, t>= 0
{0, t< 0

regards
2. (Original post by Perry)
Hello, Does anyone know what a unit step function curve looks like. The question is

the unit step function is defined by
u(t) = {1, t>= 0
{0, t< 0

regards
Its a straight line along the t-axis (x-axis) for t<0 and at straight line along the line u=1 for t>=0.
3. (Original post by ditzy blonde)
Its a straight line along the t-axis (x-axis) for t<0 and at straight line along the line u=1 for t>=0.
So there are two hotizontal lines, one at less then t<0 along the x axis and other line at u=1 (y axis) for t>=0?

regards
4. (Original post by Perry)
So there are two hotizontal lines, one at less then t<0 along the x axis and other line at u=1 (y axis) for t>=0?

regards
Yep, it looks like a pretty pointless graph, but I'm sure it shows something really important!
5. (Original post by ditzy blonde)
Yep, it looks like a pretty pointless graph, but I'm sure it shows something really important!
Cheers One other curve, is the Ramp Function curve:- is it like a y=mx +c type curve without the constant, ie at 45 degree angle going into the north east corner.?

And the other curve was a Rectangular function curve. Whats that one like.

Regards
6. (Original post by Perry)
Cheers One other curve, is the Ramp Function curve:- is it like a y=mx +c type curve without the constant, ie at 45 degree angle going into the north east corner.?

And the other curve was a Rectangular function curve. Whats that one like.

Regards
I think the ramp function sound right, but I'm not 100%. The rectangular function will probably be a rectangle plotted on the axes somehow. Do you have the definition for it like the one for the step function?
7. (Original post by ditzy blonde)
I think the ramp function sound right, but I'm not 100%. The rectangular function will probably be a rectangle plotted on the axes somehow. Do you have the definition for it like the one for the step function?

Yes it was, rectangular function

r(t)= {1/h, -h/2<= t <= h/2
{0, modulus t > h/2

regards
8. (Original post by Perry)
Yes it was, rectangular function

r(t)= {1/h, -h/2<= t <= h/2
{0, modulus t > h/2

regards
Not entirely sure, just tried plotting it and it comes out as:
a horizontal line along the x-axis until the point t=-h/2
a horizontal line along the line r(t) = 1/h between the points t=-h/2 and t=h/2
and a horizontal line along the x-axis after the point t=h/2

_________------------------_____________

Kinda like that, being symmetric about the point t=0
9. (Original post by ditzy blonde)
Yep, it looks like a pretty pointless graph, but I'm sure it shows something really important!

Hello, For the unit step funtion how does the graph of u(t) + 2 look like is it just raised to 2 in the y axis, ie from zero does the step just jump to 2. And for u(t) -1 does the step go into negative y axis?

regards

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Updated: December 11, 2003
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