How can I put 2 functios together in just one function?

Hi there! I have created 2 functions :

function [tk]= time(t,toe)
ti=t-toe;
    if ti>302400;
        tk= ti-604800;
    elseif tk<-302400;
        tk = ti+604800;
    end
end

and the second function :

function [mk] = meanan(mo,a,u,n,tk)
    mk = mo +((sqrt(u)/sqrt(a^3))+n)*tk
end

Now my question is : Can I put this 2 functions in just one function in MATLAB? I've been looking on internet but what I found is NO, it is not possible. Is it right? I cannot put 2,3 or maybe more functions in just one? Thank you!

Answer 1

[Walter Roberson]

function mk = meanantime(mo, a, u, n, t, toe)
  ti=t-toe;
  if ti>302400;
      tk= ti-604800;
  elseif tk<-302400;
      tk = ti+604800;
  end

    mk = mo +((sqrt(u)/sqrt(a^3))+n)*tk;

But what I suspect you are asking is whether you can put multiple functions into the same .m file and still be able to call each one from outside of the .m file.

The answer to that is "Not easily". Someone did, however, point out the other day that it is possible to create static class methods that can be invoked by name from outside the .m file. This would require changing the combined .m file into a classdef with appropriate structuring.

Answer 2

[Birdman]

Usage of nested functions should help you here:

function tk= time(t,toe,mo,a,u,n)
ti=t-toe;
    if ti>302400
        tk=ti-604800;
    elseif ti<-302400
        tk = ti+604800;
    end
    tk=@meanan;
    function [mk] = meanan(x)
        mk = mo +((sqrt(u)/sqrt(a^3))+n)*x;
    end
end

Since meanan function uses variables which are inputs of time function, it would be wiser to use them nested. Then from command line, call them as follows:

 tk=time(1,2,3,4,5,6) %creates a function handle and pass all inputs to meanan function
 mk=tk(4)

Inputs are randomly selected. Hope this helps.

Answer 3

[gblmtc]

Thanks guys for your help!

What I acctualy need to do is to do the calculations from the pics I’ve attached.

I did a function for each formula andnow I was thinking to put all togheter to can just call a big function and to get the final result.

I’ve checked FUNCTIONS on Mathworks but couldn’t find a creal answer.

Thanks again!

[Birdman]

Well, you can use nested functions for gathering functions all together. Have you checked my answer about how I did it?

[Walter Roberson]

With R2016b or later, you can put a script at the top of a .m file, and put any number of functions after that in the script. The functions must all have "end" statements matching their "function" statements though.

[gblmtc]

Thanks for your help!

I'm new here and MATLAB drives me crazy! :)))

Yes Birdman, your solution works!

I'll try it with the script to see how it works but I check the nested functions, too.

Again thanks!

[Birdman]

You are welcome! We are here for further questions.

Answer 4

[gblmtc]

function all_one

function [tk]= time(t,toe)
ti=t-toe;
    if ti>302400;
        tk= ti-604800;
    elseif tk<-302400;
        tk = ti+604800;
    end
end

function [mk] = meanan(mo,a,u,n,tk)
    mk = mo +((sqrt(u)/sqrt(a^3))+n)*tk
end

function [ek] = ecc_an (mk, e)
ek= mk/(1-e)
end

function [vk] = true_an(ek, e)
vk = atan((sqrt(1-e^2)*sin(ek))/(cos(ek)-e)
end

function [uk] = arg_lat(o,vk,cuc,cus)
uk = o + vk + cuc*cos(o+vk) + cus*sin(o+vk)
end

function [rk] = rad_dist(a,e,ek,crc,o,vk,crs)
rk= a(1-e*cos(ek))+crc*cos(2)*(o+vk)+crs*sin(2)*(o+vk)
end

function [ik] = incl(io,i,tk,cic,o,vk,cis)
ik = io+i*tk+cic*cos(2)*(o+vk)+cis*sin(2)*(o+vk)
end

end

So I've created a script and put there all the functions I've created before. I gave values to inputs and now I just write in the command window " all_one" ?

What's the correct way for calling the big function?

Thanks again!