MATLAB: How to make a constant global so all packages files use it

global

hello! I would like to define a constant in such a way all my functions in the package folders use it , how can I do it ?? Thank you in advance .

Best Answer

As Stephen has explained already, passing variables as arguments is the best practice.

If you have really good reasons to define a constant globally, do not use global, but prefer a dedicated function, which provides the values as struct:

function C = myPackageConstants()
C.g  = 9.81;
C.pi = 3.14159265;
C.VolumeOfHeidelbergBarrel = 221716;  % liter

Then call this from all function as:

C = myPackageConstants;

This is less clear than using arguments. If it is called very often, it might matter that it has a certain runtime overhead. But in opposite to globals, you can be sure that the values are not modified anywhere, such that debugging gets horrible.

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MATLAB: How to manually insert variables I have declared symbolically into a zero matrix

>> syms k1 k2 k3 k4
        global_k1 = sym(zeros(4,4));
        global_k2 = sym(zeros(4,4));
        global_k3 = sym(zeros(4,4));
        global_k4 = sym(zeros(4,4));
        global_k1(1,1) =  k1;
        global_k1(1,2) = -k1;
        global_k1(2,1) = -k1;
        global_k1(2,2) =  k1;
        global_k2(2,2) =  k2;
        global_k2(2,3) = -k2;
        global_k2(3,2) = -k2;
        global_k2(3,3) =  k2;
        global_k3(2,2) =  k3;
        global_k3(2,3) = -k3;
        global_k3(3,2) = -k3;
        global_k3(3,3) =  k3;
        global_k4(2,2) =  k4;
        global_k4(2,4) = -k4;
        global_k4(4,2) = -k4;
        global_k4(4,4) =  k4;
        global_k1
        global_k2
        global_k3
        global_k4
        k_stiff = global_k1+global_k2+global_k3+global_k4;
        disp('The stiffness matrix is: ')
        disp(k_stiff);
global_k1 =
[  k1, -k1, 0, 0]
[ -k1,  k1, 0, 0]
[   0,   0, 0, 0]
[   0,   0, 0, 0]
global_k2 =
[ 0,   0,   0, 0]
[ 0,  k2, -k2, 0]
[ 0, -k2,  k2, 0]
[ 0,   0,   0, 0]
global_k3 =
[ 0,   0,   0, 0]
[ 0,  k3, -k3, 0]
[ 0, -k3,  k3, 0]
[ 0,   0,   0, 0]
global_k4 =
[ 0,   0, 0,   0]
[ 0,  k4, 0, -k4]
[ 0,   0, 0,   0]
[ 0, -k4, 0,  k4]
The stiffness matrix is: 
[  k1,               -k1,         0,   0]
[ -k1, k1 + k2 + k3 + k4, - k2 - k3, -k4]
[   0,         - k2 - k3,   k2 + k3,   0]
[   0,               -k4,         0,  k4]

MATLAB: How define a variable like pi in matlab

create a function

function out=cst1
  out=0.12453648

then call the function cst1

a=cst1

Best Answer

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MATLAB: How to manually insert variables I have declared symbolically into a zero matrix

MATLAB: How define a variable like pi in matlab

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