MATLAB: Matlab won’t plot anything. please help why

probability

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

Best Answer

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
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