scilab-delayed-equations

Numerical computing (tag : Matlab, Scilab)

Find just a solution non constant is enough job !

Be to solve f(x+1)=f(x) easy constant functions fit but excluded, but 1-T periodic functions fit OK

        f(x+1)=2*f(x) easy 2^x fits for integers OK, but in |R ?
        
        f(x)=f(2*x) ? (non const equired) Can we help with derivative too ?

P173 of book https://books.google.fr/books?id=jmIECAAAQBAJ&pg=PA173&lpg=PA173&dq=scilab+delay+equation&source=bl&ots=j4T3mqGEPC&sig=ACfU3U3aAu8BRv7Eao-tvXx86UR8h7J9ig&hl=en&sa=X&ved=2ahUKEwiCtMf_l-zmAhX-DmMBHUF4BqkQ6AEwCXoECAgQAQ#v=onepage&q=scilab%20delay%20equation&f=false