What function does the following code perform?

tol=[1.d-8,1.d-8];

Answer 1

[Niklas Nylén]

The d can apparently be used instead of e for exponent number formats, i.e. the following are equal:

 1d-8
 1e-8
 10^-8

The dot after the ones are just decimal points which are not followed by any decimals.

So, the answer to your question is that the code creates the matrix

 tol = [0.00000001 0.00000001]