MATLAB: How to compute symbolic integrals

symbolic integrals subs

This is my code,I want to compute symbolic integrals,but the F1 I got is full of NAN.Why?and what should I do?
format long;
t=1:10000:8460000;
k=0.07;b=13.8'; ，
c=3e8;
v=0.062.*c;
eNi=3.9e10;
eCo=6.8e9;
tNi=8.8*86400;
tCo=111.3*86400;
M=1.9891e30;
Mej=2.1.*M;
kr=0.133;
A=(3.*kr.*Mej)/(4.*pi.*v^2);
M_Ni=0.1.*M;
tm=sqrt((2.*k.*Mej)/b.*v.*c);
P=@(x)eNi.* M_Ni.*exp(-x./tNi) + eCo.* M_Ni.*((exp(-x./tCo)-exp(-x./tNi))./(1-tNi/tCo));
f=@(x)exp(x.^2./tm^2).*x./tm.*P(x);
syms a
F=int(f,0,a);
F1=double(subs(F,a,t));

Best Answer

Wanted=zeros(size(t)); 
for k=1:numel(t)
  Wanted(k)=integral(f,0,t(k));
end
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