How to make while loop faster ?

Hello all ,

I have so simple while loop to sum , and it is taking really so long time , and i do not know if it is normal to take this time or not

D_1 = 1.5e-13;
D = 0;
n = 0;
n_cyc = [0.500000000000000	15.5000000000000	1	1	1	1	1	1	1	1	1	1	1	0.500000000000000	0.500000000000000];

while D < 1
        
         % D factor
        D = D +D_1;                % total damage
        n= n + sum(n_cyc);  % sum of cyclic Values for all the Blocks till the Fracture
    
end

Thank you for any helping

Answer 1

[Star Strider]

First, the number of iterations is going to be:

n_iter = 1/D_1

evaluating to:

n_iter =
     6.666666666666667e+12

That is going to take a while.

I do not understand the reason for the loop anyway.

Unless I am missing something, at the end of the loop:

n = sum(n_cyc) * n_iter

or:

n =
     1.866666666666667e+14

So I would simply do that one multiplication and be done with it!

[khaled elbatawy]

Thank you for your answer .

Yes i know that it could be in this way but the loop should have more values and Calculation .

The whole picture of what i am generating force signal as sinus function and calculate of it Stresses and then Calculate from that The Damage factor D and in the loop if it is not reaching 1 yet then add another signal or addition Signal of force and recalculate

I wanted to make it in this way so i was hoping if there is possiblity or another way to succeed that

[Star Strider]

My pleasure!

I would not use such a small step (1.5e-13) initially. Use larger steps, determine when the failure occurs, then use those limits in subsequent runs of the while loop with progressively smaller steps over a smaller total interval to determine more precisely when the failure occurs.

It still might be more efficient to use other approaches than a while loop, however since I have no idea what you are doing, I have no idea what to suggest.