Constants that cannot be delete with CLEAR

Simple,

I have some personal constants define in startup.m but every time I type CLEAR in the command window I loose them.

Is there a way to make some constants non deletable ?

Thank you.

Answer 1

[Matt J]

You could make the constants the Constant properties of a class. Then they can be reused even after issuing clear

classdef myconst
    properties (Constant)
     a=1;b=2;c=3
    end
end 

>> myconst.a

ans =

1

>> clear

>> myconst.b

ans =

2

[Pierre]

Perfect !!!

Answer 2

[Dyuman Joshi]

You can use this command

clearvars -except VariblesNotToBeDeleted

[Pierre]

I little bit too long, imagine I have many constants.