search for: pprime

R help list subscribers, I am a new user of R. I am attempting to use R to explore a set of equations specifying the dynamics of a three trophic level food chain. I have put together this code for the function that is to be evaluted by LSODA. My equations Rprime, Cprime, and Pprime are meant to describe the actual equation of the derivative. When I run LSODA, I do not get the output that these equations should be giving. Can someone tell me if I have set this function up correctly to use with LSODA when the user is specifying the equation of the derivative or offer som...

Hey everybody, I have a matrix with three columns. I want to plot two columns (independent variable) against one column (the defendant). This is my code and the error associated with it: plot(p, q, data=columns) > plot(pprime,q, add=TRUE) Warning messages: 1: In plot.window(...) : "add" is not a graphical parameter 2: In plot.xy(xy, type, ...) : "add" is not a graphical parameter 3: In axis(side = side, at = at, labels = labels, ...) : "add" is not a graphical parameter 4: In axis(side =...

...en choose(Q1,testn) (where testn is equal to the nn shown above) works without a problem. I'm not sure if it's related, but I'm also having problems with browser() not firing the first time through and/or having code continue to execute before it interrupts, i.e.: ------ Browse[2]> pprime <- sum(testma) Error: object 'testma' not found Browse[2]> Browse[2]> loopvar <- loopvar + 1 Browse[2]> debug at #3: partial1 <- (((1 - f11) * (1 - f12))^(Qone - nn)) * ((f11 + (1 - f11) * f12)^nn) Browse[2]> print(proc.time() - ptm) user system elapsed 0.33...