"Local function name must be different from the script name" error

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Emre Tuzcu
Emre Tuzcu 2021-3-2
编辑： Stephen23 2024-4-9
Hi, I wrote a simple code but I can't get output of the function because of this error. Name of the file is "main.m".
And it also says that this is a local function. Should I/how can I make it main function? The code is:
clear;
function [any, tri, sqr, rect] = main(number_of_sticks)
%This function will be used for finding if we can construct
%equilateral triangle/square/rectangle
tri=(rem(number_of_sticks,3)==0);
sqr=(rem(number_of_sticks,4)==0);
rect=(rem(number_of_sticks,2)==0);
any=(tri==1 || sqr==1 || rect==1);
end

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Stephen23
Stephen23 2021-3-2
编辑：Stephen23 2021-3-2
clear; % !!!!!!!!!! Delete this line !!!!!!!!!
function [any, tri, sqr, rect] = main(number_of_sticks) % first line of the file
Putting clear on the first line makes your file a script and causes that error (because you named the script file with the same name as the local function). Putting clear serves no purpose. Do not add things that serve no purpose.
I strongly recommend that you avoid using the variable name any.
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Seth
Seth 2024-4-9
i dont have a "clear;" this is my code,
function[yPosition, ProjectileVelocity] = projectileMotion(xPosition)
y0 = 2.0; % meters
theta = 35; % degrees
v0 = 25.0; % meters/second
g = 9.81; % m/s^2
theta = theta * pi / 180;
yPosition = xPosition * tan(theta) - (1/2) * (xPosition^2 * g) / (v0 * cos(theta))^2 + y0;
vx = v0 * cos(theta);
vy = sqrt((v0 * sin(theta))^2 - 2 * g * yPosition);
ProjectileVelocity = sqrt(vx^2 + vy^2);
end
xPosition = 25;
[yPosition, ProjectileVelocity] = projectileMotion(xPosition);
disp(['Projectile height at x = ', num2str(xPosition), ' meters: ', num2str(yPosition), ' meters']);
disp(['Projectile velocity at x = ', num2str(xPosition), ' meters: ', num2str(ProjectileVelocity), ' m/s']);
Stephen23
Stephen23 2024-4-9
编辑：Stephen23 2024-4-9
@Seth: the problem is the code after the function definition. Either:
  • move it to a separate script, or
  • move it to before the function definition.
"Before R2024a: Local functions in scripts must be defined at the end of the file, after the last line of script code."
Source: https://www.mathworks.com/help/matlab/matlab_prog/local-functions-in-scripts.html

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