MATLAB: Use variables of one .m file in another .m file

use multiple .m filesvariable

Hi all!

I want to have one .m file declaring a lot of constants and use these constants in my other .m files. Such that if I want to change these constants, I only have to change one file, and not have to go through all my .m files. Is this possible?

Thanks a lot!

Best Answer

You can define the constants in one file and save them in a mat file:

save('myfile.mat','name_var1','name_var1')

and read in this file in the other m-files:

load('myfile.mat')

Related Solutions

MATLAB: Lagrange Equations M-file

Save this to a file with a .m extension

function  [out1,out2,...outM] = LagrangeEquations(arg1, arg2,arg3,...,argN)
%Your code here

Also try some online tutorials, e.g.,

http://www.youtube.com/watch?v=NPd13u4i6fM

MATLAB: Matlab M-File

You should review the documentation on how to write a function, since your above code is not a correctly written function. First, come up with a name for your function, e.g. myFunction. Then create a new file called myFunction.m somewhere on the MATLAB path (e.g. your working directory). Then in that file put your code. E.g.,

function result = myFunction(V)
result = V;  % <-- allocate the result variable, copying all elements
%

% Insert your code here to create the result variable from the V variable
%
return
end

I will give you some hints about correcting your code:

Change this loop:

for i=1:1:6;  % <-- hard coded for exactly 6 elements

to this

for i=1:numel(V)  % <-- allows any size input

The following test has an error in the logic (compare this carefully with the requirement):

if [V(i)<0 | mod(V(i),2)==0 | mod(V(i),4)==0]

The following line has an error on the right hand side calculation (compare this carefully with the requirement):

    V(i)=i*i;

If you don't see what the errors are, step through a small example by hand and compare that to the code result. E.g., at the command line type this:

V=[10,4,7,-8,-3,-12];
myFunction(V)

Best Answer

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MATLAB: Lagrange Equations M-file

MATLAB: Matlab M-File

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