how to plot euler formula in matlab?

I want to plot exponential signal that is euler formula exp(i*pi) in MATLAB but output figure is empty and does not shows graph as shown in attached, even i tried plotting simpler version, i mean

exp(i*pi),but still figure was empty

[Turlough Hughes]

There is an example of plotting exponentials in the documentation here, see the sub heading Plot Exponential Function. If you're trying to observe a single point on the plot you could also write

plot(y,'or')

Answer 1

[Star Strider]

The plot function plots lines between points. You have only one point, so if you change the plot call to:

y = exp(100*i*pi)

figure
plot(y,'p')

plots a star at (1,0).

[ABTJ]

Your current answer is okay. If comfortable for you,Please edit it to adjust for updated question that is plotting euler formula

[Star Strider]

If you mean the Euler identity :

y = exp(100*i*pi)
y = cos(100*pi)+j*sin(100*pi)

with both producing:

y =
     1.0000e+000 +  1.9644e-015i

y =
     1.0000e+000 +  1.9644e-015i

That is the best I can do with the information I have.

[ABTJ]

But still in this case we are getting only one point at (1,0). How we can see ful wave/plot of euler identity for atlest one period??

[Star Strider]

Add a time-varying vector:

t = linspace(0,2);
y = exp(100*i*pi*t)
y = cos(100*pi*t)+j*sin(100*pi*t);

and now the results will go from 0 to .

To see it:

figure
plot(t, real(y),    t, imag(y))
grid

The two ‘y’ vectors are the same, so this works for either one of them.

Answer 2

[KSSV]

i = linspace(0,1,100) ; 
y = exp(100*i*pi) ;
plot(i,y)