not enough input arguments using variables from another equation system

Question

Karen 2025-5-15

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2177238-not-enough-input-arguments-using-variables-from-another-equation-system

评论： Stephen23 2025-5-16

Hi, Im modeling a series of cstr

clc
clear
close all
x1 = [0;0;0];
x = fsolve(@TAC1,x1)
Equation solved.

fsolve completed because the vector of function values is near zero
as measured by the value of the function tolerance, and
the problem appears regular as measured by the gradient.
x = 3×1
    0.0688
    0.0259
    0.0026
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function y = TAC1(x)
    eq1 = 7*x(1)+0.437*(x(1)^0.5)*(x(2)^0.5)-5/10;
    eq2 = 7*x(2)+0.437*(x(1)^0.5)*(x(2)^0.5)-2/10;
    eq3 = 0.437*(x(1)^0.5)*(x(2)^0.5)-7*x(3);
    y=[eq1,eq2,eq3];
end
z2 = [0;0;0];
z = fsolve(@TAC2,z2)
Not enough input arguments.

Error in solution>TAC2 (line 19)
    eq4 = 7*x(1)-8*z(1)-0.437*(z(1)^0.5)*(z(2)^0.5);
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Error in fsolve (line 167)
            fuser = feval(funfcn{3},x,varargin{:});
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Caused by:
    Failure in initial objective function evaluation. FSOLVE cannot continue.
function y = TAC2(x,z)
    eq4 = 7*x(1)-8*z(1)-0.437*(z(1)^0.5)*(z(2)^0.5);
    eq5 = 7*x(2)-8*z(2)-0.437*(z(1)^0.5)*(z(2)^0.5)+1/100;
    eq6 = 7*x(3)-8*z(3)+0.437*(z(1)^0.5)*(z(2)^0.5);
    y=[eq4,eq5,eq6];
end