Gov2001 March 2008

gov2001@lists.gking.harvard.edu

36 participants
58 discussions

[gov2001-l] LaTeX troubles

by keith.schnakenberg＠gmail.com

I'm new to LaTeX, and I have never encountered this problem until now: When I try to typeset my file with LaTeX, it gives me this error message: "(Please type a command or say `\end')" I did not forget to /end{document} so it is unclear why this is the case. I also checked to see if I left a verbatim environment open somewhere, but I did not. What are some other reasons I might get this message, and how might I fix it?

16 years, 1 month

[gov2001-l] Useful handouts on probability

by john.sheffield＠gmail.com

Hi everyone, I posted some useful handouts from a probability class to my FAS space. The documents "Distributions" and "Sums of Independent RVs" are particularly helpful. John

16 years, 1 month

[gov2001-l] using optim for functions with multiple arguments

by ltai＠post.harvard.edu

I am curious to know what, if any, the syntax for optim is if I have a function with multiple arguments and I want to maximize over just the first argument. My previous attempts have resulted in program errors. Thanks, Laurence

16 years, 1 month

[gov2001-l] Graphs in (f)

by jeremy.hodgen＠kcl.ac.uk

Cancel that request. I've sorted it. No good sending stuff to a vector that doesn't exist! Jeremy > Can anyone help? I can't get both plots on the same graph. > Everything else works OK & I can plot each individually. Here's my > code: > > a <- seq(from = -12, to = 12, by = .01) > out1 <- c() > for (i in 1:length(a)){ > out1[i] <- fbin.rep(a[i], y=y.bin1) > out2[i] <- fbin.rep(a[i], y=y.bin2) > } > # > a <- pnorm(a, sd=4) > plot(a, out2, type="l", lwd=1.5, xlab="Binomial parameter: pi", > ylab= "log-likelihood") > lines(a, out1, col="blue", lty="dashed") > abline(v = pnorm(opt1$par, sd=4), col = "skyblue", lty="dashed") > abline(v = pnorm(opt2$par, sd=4), col = "hotpink") > > Thanks > > Jeremy > Dr Jeremy Hodgen Senior Lecturer in Mathematics Education King's College London Department of Education and Professional Studies Franklin-Wilkins Building Waterloo Bridge Wing 150 Stamford Street London SE1 9NH Tel: 020 7848 3102 Fax: 020 7848 3182 E-mail: jeremy.hodgen at kcl.ac.uk

16 years, 1 month

[gov2001-l] Graphs in (f)

by jeremy.hodgen＠kcl.ac.uk

Can anyone help? I can't get both plots on the same graph. Everything else works OK & I can plot each individually. Here's my code: a <- seq(from = -12, to = 12, by = .01) out1 <- c() for (i in 1:length(a)){ out1[i] <- fbin.rep(a[i], y=y.bin1) out2[i] <- fbin.rep(a[i], y=y.bin2) } # a <- pnorm(a, sd=4) plot(a, out2, type="l", lwd=1.5, xlab="Binomial parameter: pi", ylab= "log-likelihood") lines(a, out1, col="blue", lty="dashed") abline(v = pnorm(opt1$par, sd=4), col = "skyblue", lty="dashed") abline(v = pnorm(opt2$par, sd=4), col = "hotpink") Thanks Jeremy Dr Jeremy Hodgen Senior Lecturer in Mathematics Education King's College London Department of Education and Professional Studies Franklin-Wilkins Building Waterloo Bridge Wing 150 Stamford Street London SE1 9NH Tel: 020 7848 3102 Fax: 020 7848 3182 E-mail: jeremy.hodgen at kcl.ac.uk

16 years, 1 month

[gov2001-l] LaTeX math guide

by abfriedman＠gmail.com

Just found this and thought others might find it helpful for finding the more obscure math symbols in LaTeX: ftp://ftp.ams.org/pub/tex/doc/amsmath/short-math-guide.pdf Ari

16 years, 1 month

[gov2001-l] Problem 1c

by keith.schnakenberg＠gmail.com

I've implemented the method of bisection using three embedded "while" loops. My problem is that, when I call for the function, it runs forever even though I have specified a maximum number of iterations. It has been running long enough that I suspect it is going to run it an infinite number of times. Without revealing my code for the whole problem, I'll show enough code demonstrate how I am telling it to stop after k iterations. while(fx(((x+y)/2)) != tol && i < iter.max){ i = i+1 while(){ while(){ } } } So, my first theory was that the other two loops were running infinitely (or a lot of times) within each iteration of the first while loop. However, I added "&& i < iter.max" to the end of the other while loops and this did not help. Other theories?

16 years, 1 month

[gov2001-l] Homework

by Jeremy.Hodgen＠kcl.ac.uk

Just checking - there's just the one problem for homework this week Jeremy Dr Jeremy Hodgen Senior Lecturer in Mathematics Education King's College London Department of Education and Professional Studies Franklin-Wilkins Building Waterloo Bridge Wing 150 Stamford Street London SE1 9NH Tel: 020 7848 3102 Fax: 020 7848 3182 E-mail: jeremy.hodgen at kcl.ac.uk

16 years, 1 month

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Gov2001 March 2008