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...ique, but do not know what to use for a multiple regression* If anybody can provide some feedback on this, it would be greatly appreciated. Kind Regards, Craig -- <>< <>< <>< Craig O'Connell University of Massachusetts Dartmouth Marine Biologist www.youtube.com/craigpoconnell craigosea.blogspot.com [[alternative HTML version deleted]]

...I can fix this, or at least would you happen to know what the error is referring to? Thanks and a response would be greatly appreciated. Kind Regards, Craig -- <>< <>< <>< Craig O'Connell University of Massachusetts Dartmouth Marine Biologist www.youtube.com/craigpoconnell craigosea.blogspot.com [[alternative HTML version deleted]]

Dear R-users, I am currently modifying a previously developed predator prey model and was curious if there was a way to add in a disturbance to the model (let's say at time t=100). The disturbance can be the introduction of 40 prey (N=40) and 10 predators (Pred = 10). I would like to see my model go from a state of equilibrium (up to t = 99), show this disturbance (at t = 100) and then

I need to find the area under a trapezoid for a research-related project. I was able to find the area under the trapezoid in MATLAB using the code: function [int] = myquadrature(f,a,b) % user-defined quadrature function % integrate data f from x=a to x=b assuming f is equally spaced over the interval % use type % determine number of data points npts = prod(size(f)); nint = npts -1; %number of