how to call this function in another script?

Question

Mohammed AlQahtani 2022-2-9

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1646255-how-to-call-this-function-in-another-script

回答： Nivedita 2023-11-14

function M=bisFor(f, a, b, ~)
M=ceil((log10(b-a)/TOL)/log10(2));
FA=f(a);
value=(1:M);
for i=value
    p=a+(b-a)/2;
    FP=f(p);
    if sign(FA)==sign(FP) 
        a=p;
        FA=FP;
    else
        b=p;
    end
end
p=a+(b-a)/2;
end

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Abolfazl Chaman Motlagh 2022-2-9

the error is in mmmm.m file. you should show us what is in line 7 of that.

Jan 2022-2-9

编辑：Jan 2022-2-9

在 MATLAB Online 中打开

Just a hint:

value=(1:M);
for i=value

This is much slower than:

for i = 1:M

What is the purpose of defining a 4th ignored input?

function M=bisFor(f, a, b, ~)
%                          ^ ??

On the other hand, what is "TOL"? Do you want to provide this as 4th input?

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Answer 1

Nivedita 2023-11-14

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1646255-how-to-call-this-function-in-another-script#answer_1352212

在 MATLAB Online 中打开

Hello Mohammed AlQahtani

I understand that you want to call the "bisFor" function in another script. To call this function in another script, you just need to make sure the function is in your MATLAB path. Then, you can call it just like any other function.

Here's an example of how you can call this function:

% Define the function you want to find the root of
f = @(x) x^2 - 2;
% Define the interval [a, b]
a = 1;
b = 2;
% Define the tolerance
TOL = 1e-5;
% Call the bisFor function
M = bisFor(f, a, b, TOL);
% Display the result
disp(M);

In this script, we first define the function "f" using a function handle. This function is "x^2 - 2", which has a root at "sqrt(2)". Then we define the interval [a, b] where we want to find the root, and the tolerance "TOL" for the bisection method. Finally, we call the "bisFor" function with these parameters and display the result.

Please replace the function "f", the interval [a, b], and the tolerance "TOL" with your own values as needed.

For more information on function handles, you can refer to the following documentation link:

https://www.mathworks.com/help/matlab/matlab_prog/creating-a-function-handle.html

I hope this helped!

Regards,

Nivedita.