Error using sum Invalid data type. First argument must be numeric or logical.
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Hi everybody.
I try to make integration over the variable q for the expression with inside integration and summation and find the answer in the form of the numerical value. Here my simple code
function z=self_energy_summation
k=1;
w=10;
z1=load('test.txt');
tt=z1(741,1);
T_c=z1(741,2);
mu=z1(741,3);
N=1:10;
nn=10^4;
fun1=@(a,q) a.*tanh((a.^2-mu)./(2*T_c)).*log((2*a.^2+2*a.*q+q.^2-2*mu-1i*2*pi.*N(1:10).*T_c)./(2*a.^2-2*a.*q+q.^2-2*mu-1i*2*pi.*N(1:10).*T_c))./q-2;
Gamma0=@(q) tt+integral(@(a)fun1(a,q),0,nn,'ArrayValued',true);
fun2=@(q) k*w*Gamma0./q.^3;
R=@(q) sum(fun2);
y=integral(@(q) R(q),0.001,nn,'ArrayValued',true)
end
Before the last integration I get the error
"Error using sum Invalid data type. First argument must be numeric or logical."
If I execute my script without last integration then the program works correctly.
Could you help me?
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Réponses (1)
Walter Roberson
le 18 Juin 2018
R=@(q) sum(fun2(q));
5 commentaires
Guillaume
le 19 Juin 2018
fun2 = @(q) k*w*gamma0(q)./q.^3;
possibly, assuming gamma0 is supposed to use q as input.
Steven Lord
le 19 Juin 2018
You cannot perform arithmetic operations on function handles, nor can you sum them. Instead perform arithmetic or call sum on the values returned by evaluating the function handle.
f = @(x) x.^2;
g1 = 2*f(1:10) % works
g2 = 2*f % does not work
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