# MATLAB: Using functions: one from the script and another from the file.

functionsMATLAB

Hi, this is my first post and I am a new to matlab. I have a script which involves using two functions, sort of nested. I have one function in the main script and another in a seperate file which I use for the problem. This is just a sample of my problem and I believe if I can solve/understand this I will be able to tackle the main main. Below is a script and attached is a function.
``clear Np=5;x1=linspace(-0.75,0.75,Np); y1=linspace(-0.75,0.75,Np);[ a , b , c] = fun1('f'); tspan=a;Fx1 = b;Fx2 = c;[ ~ , d , e] = fun1('k'); x2 = d;y2 = e; fun =@(t1) f1(x1,y1,t1); [t3,t4] = ode45(@(t1,y1) fun(t1),tspan ,0 );% f1(1,1,1)function y= f1(x1,y1,t)     x3 = d(x1,y1,t);     y3 = e(x1,y1,t);     y = x3.^2+y3.^2+sqrt(x3.^2+y3.^2);      end``
``  Undefined function 'd' for input arguments of type 'double'.Error in script>f1 (line 17)     x3 = d(x1,y1,t);Error in script (line 13)``
the code fails to recognize 'd' which it should because I have already defined it in fun1.m. Any help is appreciated.

``function y = myFun()Np=5;x1=linspace(-0.75,0.75,Np);y1=linspace(-0.75,0.75,Np);[ a , b , c] = fun1('f');tspan=a;Fx1 = b;Fx2 = c;[ ~ , d , e] = fun1('k');x2 = d;y2 = e;fun =@(t1) f1(x1,y1,t1);[t3,t4] = ode45(@(t1,y1) fun(t1),tspan ,0 );% f1(1,1,1)    function y= f1(x1,y1,t) % now this is nested        x3 = d(x1,y1,t);        y3 = e(x1,y1,t);        y = x3.^2+y3.^2+sqrt(x3.^2+y3.^2);    endend``