Functions from .mlx don't work in .mlapp

I'm trying to make an app from my .mlx file.

In .mlx I have the following snippet of code:

a = 50;
b = 60;
aP = [];
bP = [];

[aP,bP] = dosomething(a,b);

function [raP,rbP] = dosomething(x,y)
i = 0:pi/3:2*pi-pi/3;
Za = 0*i;
Xa = cos(i)*x;
Ya = sin(i)*x;
raP= [Xa;Ya;Za];
j = 0:pi/3:2*pi-pi/3;
Zb = 0*j;
Xb = cos(j)*y;
Yb = sin(j)*y;
rbP = [Xb;Yb;Zb];
end

However, when I try to use it in .mlapp as such:

properties (Access = private)
    a
    b
    aP
    bP
    end
 
    
methods (Access = private)
    function [raP,rbP] = dosomething(x,y)
            i = 0:pi/3:2*pi-pi/3;
            Za = 0*i;
            Xa = cos(i)*x;
            Ya = sin(i)*x;
            raP= [Xa;Ya;Za];
            j = 0:pi/3:2*pi-pi/3;
            Zb = 0*j;
            Xb = cos(j)*y;
            Yb = sin(j)*y;
            rbP = [Xb;Yb;Zb];
    end
    
    function startupFcn(app)
    app.a = 50;
    app.b = 60;
    app.aP = [];
    app.bP = [];
    [app.aP,app.bP] = dosomething(app.a, app.b);
    end
end

I get the following error:

Undefined function 'dosomething' for input arguments of type 'double'.

Incorrect number or types of inputs or outputs for function 'dosomething'.

Error in test/startupFcn (line 45)
            [app.aP,app.bP] = dosomething(app.a,app.b);

Error in matlab.apps.AppBase/runStartupFcn (line 68)
            ams.runStartupFcn(app, startfcn);

Error in test (line 79)
            runStartupFcn(app, @startupFcn)
 

In the .mlx the a and b variables are also doubles so what's the fuss?

Answer 1

[Walter Roberson]

Methods of your class must accept an app as parameters, unless they are declared as static methods.

static methods can have any inputs you want.

methods (Access = private)

You should consider just creating private/something.m in the directory you define the class in.

[Aleksander Gnat]

Thank you for your answer, it is the solution to this problem!