MATLAB: How to solve Index exceeds the number of array elements (1).

arrayerrorindexMATLAB

lambda=300
mu=3600/10
Rho=lambda/mu
P0=(Rho^0)*(1-Rho)
EX=Rho/(1-Rho)
ELq=Rho^2/(1-Rho)
ET=(1/(mu-lambda))*60*60
ETq=(lambda/(mu(mu-lambda)))

in the final step error appears as "Index exceeds the number of array elements (1)."

Best Answer

mu(mu-lambda) is a request to calculate mu-lambda and to use that as an index into the variable mu.

MATLAB does not have an implicit multiplication.

... I think the next computer language I design is not going to have any implicit multiplication, and is not going to use () or [] for indexing or function calls, specifically so it can give an error message about multiplication being required. Maybe I will go back to RPN notation...

Related Solutions

MATLAB: Index exceeds matrix dimensions when solving for ODE system.

The input

phi = 1 ;

should be a vector with elements 5. Try with:

phi = rand(5,1) ;

MATLAB: Solve Integral Equation with function handles

Every multiplication in ‘Fermi’ needs to be vectorised (with element-wise operations), the Symbolic Math Toolbox is not necessary, (so replace solve with fsolve), and use the ArrayValued name-value-pair in the integral call.

With those changes, your code:

dpsi = -5;
etaK = 2;
etaL = 4;
j0 = 1;
UT = 1;
Fermi = @(eta) sqrt(pi) ./ (2 .* (3/4 .* sqrt(pi) .*( eta.^4 + 33.6.*eta .* (1.0-0.68.*exp(-0.17*(eta+1).^2) ) + 50).^(-3/8) + exp(-eta) ));
InnerInt = @(eta, flux) 1/ ( flux/Fermi(eta) + dpsi/UT);
integralEq = @(flux) integral(  @(eta) InnerInt(eta, flux), etaK, etaL, 'ArrayValued',1);
jKG = j0 * fsolve(@(x) integralEq(x) - 1, 10)

now produces this result:

jKG =
             -3033.2578125

Best Answer

Related Solutions

MATLAB: Index exceeds matrix dimensions when solving for ODE system.

MATLAB: Solve Integral Equation with function handles

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