Question

MATLAB

Q1 A signal x(t) is shown in the following figure: X) 3 -2 1 01 2 3 sketch x( t+2).

Answer 1

Look like figure is handmade, values are not clear.

Let us se the effect of incremnt the argument of any function on its value.

Let for any function, we modify the function from

f(t) ==> f(t+k)

Now, for f(0), we will get the value that we got earlier at f(-k), at f(k), we will get the value we used to get earlier at f(0). In general, we can conclude that:

On adding a value k to the arguement , the graph is shifted k value to the left.

For the above figure, i will modify the graph provided by you. Resultant graph is:

In matlab, we are given 2 vectors to plat a graph, x and t.

To plot x(t+2, we just need to create another vector t1 = t+2 and plot t1 and x.

For example , if a graph is plotted using

plot(t, x).

To plot the new graph of x(t+2), we need to replace plot(t,x) with

t1 = t1+2;

plot(t1,x);