MATLAB: How to use symbolic betainc

betabetaincincomplete beta function

I have a problem when I try to use the incomplete beta function, I declare the variable with syms, but when I try solve the problem, matlab says(??? Undefined function or method 'betainc' for input arguments of type 'sym'.)

How can I solve this?

before of all, Thank you.

Best Answer

betainc is not defined for symbolic inputs:

doc betainc

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MATLAB: How to plot this implicit function

Try symbolic expression

clc,clear
alpha=1.5; A=0.0207; gamma=0.25;
syms beta eps
x = (beta-alpha*(beta-gamma)+sqrt((beta-alpha*(beta-gamma)).^2+4*alpha*beta*gamma*A))./(2*beta);
y =  x.*(1-x).*beta/gamma;
t =  -x+x.*y.*(alpha-eps*beta)./((A+x+y).^2);
d =  eps*beta.*x.*y.*(x.^2+(A+x).*x+A*alpha)./((A+x+y).^3);
    % convert symbolic expression to function handle
F = matlabFunction(t.^2 - d,'vars',[beta eps]);
ezplot(F,[0,1,0,1]);

MATLAB: Symbolic variable

re=solve(GG); will return symbolic numbers. You need to apply double() to the symbolic numbers to convert them to floating point numbers.

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