Generate 2D array pattern efficiently

[johndoe108]

I created this for loop 

to create a pattern in a 2D array that looks like this (for N=5):

012345

112345

222345

333345

444445

555555

Is there a more efficient way of doing the same thing: Input any N and get the above shown matrix pattern?

I appreciate any guidance on this subject!

Thank you.

[Darin.K · Accepted solution]

[johndoe108]

Genius! Haha. 

Thank you!

[Nambu123]

Separating the two loops gives me another factor of 2 in speed.

[GerdW]

Hi Nambu,

for which value of "N"?

(Have you tried to use loop parallelism for large values of N? With disabled debugging options?)