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# Matlab - symsum with itegral

## Matlab - symsum with itegral

(OP)
Hello,

I am trying to calculate the following:

I am using the following code:
if true
clear all;
close all
clc;
SNR0dB = 40;
SNR0 = 10 ^ (SNR0dB / 10);
LaserIntensity = 1877;
EffNoisePower = 4;
tmp_sigma = 20;
m=1;
rho=0.5;
H=1;
C = sqrt(SNR0*EffNoisePower) / LaserIntensity;
Zn_1 = inf;
Zn = C / 0.204;
syms k x
S1 = symsum(( ((rho*m)/(H^2*(1-rho^2)))^(m+2*k-1) ) * (1/(factorial(k)*gamma(m+k))) * integral(@(r1) r1.^(2*m+2*k+1).*exp((-r1.^2.*m)/(H^2*(1-rho^2))),Zn,Zn_1), k, 0, 10)
end

I get the following error: Error using integralCalc/finalInputChecks (line 511) Input function must return 'double' or 'single' values. Found 'sym'.

Error in integralCalc/iterateScalarValued (line 315) finalInputChecks(x,fx);

Error in integralCalc/vadapt (line 132) [q,errbnd] = iterateScalarValued(u,tinterval,pathlen);

Error in integralCalc (line 83) [q,errbnd] = vadapt(@AToInfInvTransform,interval);

Error in integral (line 88) Q = integralCalc(fun,a,b,opstruct);

Error in SumOverIntegral (line 21) S1 = symsum(( ((rho*m)/(H^2*(1-rho^2)))^(m+2*k-1) ) * (1/(factorial(k)*gamma(m+k))) * integral(@(r1) r1.^(2*m+2*k+1).*exp((-r1.^2.*m)/(H^2*(1-rho^2))),Zn,Zn_1), k, 0, 10)

Thank you.

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