Unable to convert the following expression into double array

Question

chaaru datta 2022-6-24

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1747050-unable-to-convert-the-following-expression-into-double-array

评论： chaaru datta 2022-6-25

Hello all, When I run my code, I keep getting this error: "Unable to convert expression containing remaining symbolic function calls into double array. Argument must be expression that evaluates to number."

clc;
clear all;
close all;
al = 0.5; 
n = 5; 
sig2_fsnrn = 1; 
sig2_ksln = 1; 
sig2_glnrn = 10; 
sig2_e_fsnrn = 0;
sig2_e_ksln= 0; 
sig2_e_glnrn =0; 
L = 1;
Nr = 1; 
gamma_th_dB = 3;
gamma_th = (10^(gamma_th_dB/10));
 vel_r =0; 
 c = 3*10^8; 
 fc = 915*10^6; 
 Rs = 9.6*10^3; 
 Z1 = ((2*pi*fc*vel_r)/(Rs*c)); 
 P_fsnrn = besselj(0,Z1); 
 P_ksln = besselj(0,Z1);
 P_glnrn = besselj(0,Z1); 
 
 v_phi_fsnrn = (1-P_fsnrn^(2*(n-1)))*sig2_fsnrn; 
 v_phi_ksln = (1-P_ksln^(2*(n-1)))*sig2_ksln; 
 v_phi_glnrn  = (1-P_glnrn ^(2*(n-1)))*sig2_glnrn ;
 
 rho2_fsnrn = (P_fsnrn)^(2*(n-1));
 rho2_ksln = (P_ksln)^(2*(n-1));
 rho2_glnrn = (P_glnrn)^(2*(n-1));
 
 
  OP_th = [];
  
  for j1 = -5:5:45 
     jj1 = 10^(j1/10); 
     jj1
        
     
      mu4_1 = (al^2)*v_phi_glnrn*(v_phi_ksln + (rho2_ksln*sig2_e_ksln));
      mu4_2 = (al^2)*rho2_glnrn*sig2_e_glnrn*(v_phi_ksln + (rho2_ksln*sig2_e_ksln));
      mu4_3 =  v_phi_fsnrn+(rho2_fsnrn*sig2_e_fsnrn+(1/jj1));
      mu4 = mu4_1+mu4_2+mu4_3;
      
      zeta = (al^2)*rho2_glnrn*rho2_ksln;
      mu1 = (al^2)*rho2_glnrn*(v_phi_ksln + (rho2_ksln*sig2_e_ksln));
      mu2 = (al^2)*rho2_ksln*(v_phi_glnrn + (rho2_glnrn*sig2_e_glnrn));
      mu3 = rho2_fsnrn;
     
       syms x1;
     part1 = exp((gamma_th*mu2*x1)/((zeta*x1-mu1)*sig2_glnrn));
     part2 = exp((gamma_th*mu4)/((zeta*x1-mu1)*sig2_glnrn));
     part3 = exp(-x1/sig2_ksln);
     part4_1 = (-1/sig2_fsnrn);
     part4_2 = (gamma_th*mu3)/((zeta*x1-mu1)*sig2_glnrn);
     part4 = -1/(part4_1+part4_2);
     
     pt_1 = part1*part2*part3*part4;
     I1 = int(pt_1,0,10);
     op_th1 = (1/(sig2_ksln*sig2_fsnrn))*I1;
     op_th = 1-op_th1;
     OP_th = [OP_th,op_th];            
  end
  SNRdB = -5:5:45; 
grid on;
semilogy(SNRdB,OP_th,'g-','LineWidth',1.1);

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chaaru datta 2022-6-24

Thanks for your answer sir. It means MATLAB is unable to solve the integration. So does it mean that we cannot plot this expression in MATLAB.

KSSV 2022-6-24

In a way yes.....try to find out the integration of the expression. Or read tips to see whether integration can be solved in matlab.

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Answer 1

Torsten 2022-6-24

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1747050-unable-to-convert-the-following-expression-into-double-array#answer_992570

编辑：Torsten 2022-6-24

在 MATLAB Online 中打开

clc;

clear all;

close all;

al = 0.5;

n = 5;

sig2_fsnrn = 1;

sig2_ksln = 1;

sig2_glnrn = 10;

sig2_e_fsnrn = 0;

sig2_e_ksln= 0;

sig2_e_glnrn =0;

L = 1;

Nr = 1;

gamma_th_dB = 3;

gamma_th = (10^(gamma_th_dB/10));

vel_r =0;

c = 3*10^8;

fc = 915*10^6;

Rs = 9.6*10^3;

Z1 = ((2*pi*fc*vel_r)/(Rs*c));

P_fsnrn = besselj(0,Z1);

P_ksln = besselj(0,Z1);

P_glnrn = besselj(0,Z1);

v_phi_fsnrn = (1-P_fsnrn^(2*(n-1)))*sig2_fsnrn;

v_phi_ksln = (1-P_ksln^(2*(n-1)))*sig2_ksln;

v_phi_glnrn = (1-P_glnrn ^(2*(n-1)))*sig2_glnrn ;

rho2_fsnrn = (P_fsnrn)^(2*(n-1));

rho2_ksln = (P_ksln)^(2*(n-1));

rho2_glnrn = (P_glnrn)^(2*(n-1));

OP_th = [];

for j1 = -5:5:45

jj1 = 10^(j1/10);

%jj1

mu4_1 = (al^2)*v_phi_glnrn*(v_phi_ksln + (rho2_ksln*sig2_e_ksln));

mu4_2 = (al^2)*rho2_glnrn*sig2_e_glnrn*(v_phi_ksln + (rho2_ksln*sig2_e_ksln));

mu4_3 = v_phi_fsnrn+(rho2_fsnrn*sig2_e_fsnrn+(1/jj1));

mu4 = mu4_1+mu4_2+mu4_3;

zeta = (al^2)*rho2_glnrn*rho2_ksln;

mu1 = (al^2)*rho2_glnrn*(v_phi_ksln + (rho2_ksln*sig2_e_ksln));

mu2 = (al^2)*rho2_ksln*(v_phi_glnrn + (rho2_glnrn*sig2_e_glnrn));

mu3 = rho2_fsnrn;

%syms x1;

part1 = @(x1)exp((gamma_th*mu2*x1)./((zeta*x1-mu1)*sig2_glnrn));

part2 = @(x1)exp((gamma_th*mu4)./((zeta*x1-mu1)*sig2_glnrn));

part3 = @(x1)exp(-x1/sig2_ksln);

part4_1 = (-1/sig2_fsnrn);

part4_2 = @(x1)(gamma_th*mu3)./((zeta*x1-mu1)*sig2_glnrn);

part4 =@(x1) -1./(part4_1+part4_2(x1));

pt_1 = @(x1)part1(x1).*part2(x1).*part3(x1).*part4(x1);

I1 = integral(pt_1,0,10)

op_th1 = (1/(sig2_ksln*sig2_fsnrn))*I1;

op_th = 1-op_th1;

OP_th = [OP_th,op_th];

end