Getting error with the code in ode45 function

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Mohith S 2021-5-14

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https://ww2.mathworks.cn/matlabcentral/answers/829878-getting-error-with-the-code-in-ode45-function

评论： Stephan 2021-5-15

采纳的回答： Stephan

function dy = f(t,y)

y=[9,100];

D=0.00000001;

F=96485;

Z=0.000000016;

R=0.08206*298;

C=0.05;

J=-((D*Z*F*C)/R);

dy = J*y;

t=[0 5];

inity = 0;

[t,y]=ode45(@f, t, inity);

plot(t,y)

end

This is code for Nernst-Planck equation and when i execute it with Matlab-2020RA version it is showing error as, Out of memory. The likely cause is an infinite recursion within the program.

Error in f (line 12)

[t,y]=ode45(@f, t, inity);

So help me to correct the code

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采纳的回答

Stephan 2021-5-14

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/829878-getting-error-with-the-code-in-ode45-function#answer_699698

编辑：Stephan 2021-5-14

在 MATLAB Online 中打开

t=[0 5];

inity = 1;

[t,y]=ode45(@f, t, inity);

plot(t,y)

function dy = f(~,y)

% y=[9,100]; dont overwrite y

D=0.00000001;

F=96485;

Z=0.000000016;

R=0.08206*298;

C=0.05;

J=-((D*Z*F*C)/R);

dy = J.*y;

end

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Mohith S 2021-5-14

Now im getting this error if i use the above code u have given...

f(~, y)

↑

Error: Invalid expression. When calling a function or indexing a variable, use parentheses. Otherwise, check for mismatched delimiters.

Stephan 2021-5-15

Please show the full code you use that gives error.

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MATLAB Mathematics Numerical Integration and Differential Equations Ordinary Differential Equations

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