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Error using sum Invalid data type. First argument must be numeric or logical.

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Yuriy Yerin
Yuriy Yerin 2018-6-18
评论： Steven Lord 2018-6-19
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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回答（1 个）

Walter Roberson
Walter Roberson 2018-6-18
R=@(q) sum(fun2(q));
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Steven Lord
Steven Lord 2018-6-19
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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