Incorrect description of boundary condition in vignette about mizer HOT 2 CLOSED

Hi,
Thanks for the suggestions. I'll investigate soon (I've been away from
mizer for a while and need to get back into it).

Yours

Finlay

On Mon, Jul 28, 2014 at 9:55 AM, Gustav W Delius [email protected]
wrote:

Equation (3.2) in the vignette gives an incorrect description of the
boundary condition due to reproduction. It says that the density N(w_0) of
individuals at w_0 is fixed in terms of R and g(w_0). In reality the amount
R of reproduction only contributes to the rate of change in the density.
This is correctly implemented in the code.

I do not have a good suggestion of how to change the vignette, because the
way reproduction is actually implemented is difficult to briefly describe
in the continuum formulation used in that section of the vignette. In
reality R is spread out over the entire first weight class and contributes
to the rate of change of the number of individuals in that weight class.
This is difficult to describe in that part of the vignette because it does
not yet introduce the weight classes. I would probably propose to just take
out the equation and just describe in words how reproduction is
implemented. Making a change is a good idea though, because I got really
confused by the discrepancy between the description in the vignette and the
actual implementation. It makes a big difference to the solution whether R
fixes the boundary value or whether it only affects its rate of change.

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#7.

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It turns out that there is no discrepancy between Eq. (3.2) in the vignette and the numerical implementation in the code. It just took me a while to figure out how to go from one to the other. I am closing this issue now.

from mizer.