Matlab won't plot anything. please help why?

clear all;
clc;
u = 7 ;
snrdb = 5;
for pf=0.001:0.01:1;
lamda = 2*gammaincinv((1-pf),u);
gama = db2mag(snrdb);
p = 0:(u-2);

a = exp(-lamda/2);

b = ((1 + gama)/gama).^(u-1);

c = exp(-lamda/(2+2*gama));

x = sum((1./(factorial(p))).*((lamda/2).^p))…

y = sum((1./(factorial(p))).*(((lamda*gama)/… 2*gama)).^p));

s=(a*x)+b.*(c-(a*y));
end
plot (pf,s);
grid on

[Wayne King]

Please format your code example

[Oleg Komarov]

You're plotting one point not the entire sequence.

Answer 1

[Oleg Komarov]

I did not preallocate, up to you.

Keep things not dependent on the iteration outside of the loop. Also, this can be achieved without a loop.

u     = 7 ;
snrdb = 5;
gama  = db2mag(snrdb);
pf    = 0.001:0.01:1;
p     = 0:(u-2);
b     = ((1 + gama)/gama).^(u-1);
for ii = 1:numel(pf)
    lamda = 2*gammaincinv((1-pf(ii)),u);
    a = exp(-lamda/2);
    c = exp(-lamda/(2+2*gama));
    x = sum((1./(factorial(p))).*((lamda/2).^p));
    y = sum((1./(factorial(p))).*(((lamda*gama)/2*gama)).^p);
    s(ii) = (a*x)+b.*(c-(a*y));
end
plot (pf,s);
grid on

[Farooq]

i get it now thanks so much,i appreciate it @Komarov