I want to enter a mathematical function as an argument to a function

Question

Paul 2022-9-27

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1813125-i-want-to-enter-a-mathematical-function-as-an-argument-to-a-function

评论： Paul 2022-9-27

Hello, to be more precise: I want to call in my program a function that I have created and that allows to display the plot of a mathematical function, so I want to enter in argument of this function a mathematical expression that can be for example "sin(t) or 4*t+9". Knowing that the interval "t" is defined inside the function.

My problem is the following, when I launch the program it says to me that it does not know "t", logic since at the moment or the program reads it it is not yet defined.

How to solve this problem?

main program

plot_compare(sin(t) , 5 ,20);

secondary program

function plot_compare(f,N,M)
t = [];
S_N = [];
t = linspace(-pi ,pi ,M);
b = linspace (0,10,N);
S_N = sinesum(t,b);
plot(t,f,t,S_N);
end 

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Answer 1

Stephen23 2022-9-27

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https://ww2.mathworks.cn/matlabcentral/answers/1813125-i-want-to-enter-a-mathematical-function-as-an-argument-to-a-function#answer_1061770

编辑：Stephen23 2022-9-27

在 MATLAB Online 中打开

The simple approach using a function handle:

plot_compare(@sin , 5 ,20);

plot_compare(@(t) 4*t+9 , 5 ,20);

function plot_compare(fnh,N,M)

t = linspace(-pi ,pi ,M);

b = linspace (0,10,N);

%S_N = sinesum(t,b);

plot(t,fnh(t));

end

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Paul 2022-9-27

在 MATLAB Online 中打开

Thank you

I had found the beginning of a solution on the internet with the handle function but I understood where my mistake was, I must specify in the plot function that my function "f" must be plotted as a function of "t" so it's

plot(t,f(t))

and not

plot (t,f)

Thank you again

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