How do I make variables that I enter in a script to apply to a second script without need to run or open the second one?

Hi,

I would like to enter variables in a VARIABLE_script.m

and once I run this variable_script.m it should

a) write the values in a MAIN_script.m

b) run the MAIN_script.m automatically.

The key intention is to avoid opening the MAIN_script.m

and by entering many variables makes fatal changes in

undesired positions.

The idea with a VARIABLE_script.m should fix this problem.

Below I give a small example to illustrate the problem:

Let the MAIN_SCRIPT.m contain the following commands:

k=1;

l=1;

m=15;

alpha=2;

n=alpha*k;

o=alpha*l;

p=alpha*m;

N=[k:l:m;n:o:p];

M=N';

In the VARIABLE_script.m I would like to enter ONLY the values of

k, l, m and alpha.

Then I need to write some command lines (THIS IS THE QUESTION!!!)

indicating in which script the variable should be written and

and by running VARIABLE_script.m

the Main_script would automatically adsorb the values,

execute the functions and give the output the output (for this very

particular case):

1 2

2 4

3 6

4 8

5 10

6 12

7 14

8 16

9 18

10 20

11 22

12 24

13 26

14 28

15 30

I hope someone can help me with this issue.

Thanks a lot for your attention

Emerson

Answer 1

[Walter Roberson]

Also, in your main script, as long as it remains a script (and not a function), you could code

if ~exist('alpha','variable'); alpha=2; end

and so on for the other variables. Then any variable that already has a value will not have that value overwritten by the main script.

Answer 2

[Friedrich]

Hi Emerson,

I think the easiest way is to use a function, because they are designed to do this.

function [n, o, p, N, M] = my_func(k,l,m,alpha)

n=alpha*k;

o=alpha*l;

p=alpha*m;

N=[k:l:m;n:o:p];

M=N';

end

And you call it through

 [a b c d e] = my_func(1,1,15,2)

Friedrich