MATLAB: Declaring a global variable to be used across functions and/or scripts in MATLAB

declare global variableMATLAB

Hi
I've declared a global variables I in a script file named "xyz.m"
global I;
T_P = ones(1,I);
which will call the following function:
[C_Prob] = Calculate_C_Prob();
The function, which is in another file named Calculate_C_Prob.m is defined as:
function [C_Prob] = Calculate_C_Prob();
 I = 5;
 for i=1:I
      t = prod(1-T_P(i+1:end));
 end
Now, I is a constant and should remain I = 5 in both the script as well as in the function.
Is the above declaration of the global variable correct? Also, T_P (whose value can change with time) be accessible in the function file? If not, then how to make it so?

Best Answer

global variables need to be declared in every function that they are used.
T_P will not be available to the function when you use that code. You could declare it global as well
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