please can any one help me i whrite this code to plot a figure but it give me an empty one ?

ti=40;
tb=320;
alpha=ti/tb;
k=256   ;
N=100;
peff= k/(N*(1-(1/N))^(1-k))   - k + (N*(1-(1/N)))*(alpha-1) ;
plot(peff);

Answer 1

[Azzi Abdelmalek]

Your are plotting one point

[Azzi Abdelmalek]

If N=1:100

ti=40;
tb=320;
alpha=ti/tb;
k=256   ;
N=1:100;
peff= k./(N.*(1-(1./N)).^(1-k))   - k + (N.*(1-(1./N)))*(alpha-1) ;
plot(peff);

[safi marwa]

ah oki thanks (y)

Answer 2

[Star Strider]

The plot is not empty. Changing the plot call in your code to:

plot(peff, 'bp')

will demonstrate this. You need to define your variables as vectors. Since I don’t know what you want to do, this is the closest I can come to a solution.

[safi marwa]

i want to o plot peff = f(N) where N varies from 1 to 100

[Star Strider]

It’sz not a very interesting plot, but this seems to work:

ti=40;
tb=320;
alpha=ti/tb;
k=256   ;
N=1:100;
peff= k./(N.*(1-(1./N)).^(1-k))   - k + (N.*(1-(1./N))).*(alpha-1) ;
plot(peff);

[safi marwa]

oui merci