RNA-seq.Rpres: need to use biocLite() before library() about biostat-578

[willkjh]

In the older .Rpres file, biocLite is already installed or placed in the code. Refer to https://github.com/raphg/Biostat-578/blob/master/Differential_expression.Rpres
You should take a look at the course outline and follow the series of lectures. https://github.com/raphg/Biostat-578

[brianhigh]

None of the Rpres files for this currently install limma or edgeR.

[willkjh]

Look at line 293 -295 of https://github.com/raphg/Biostat-578/blob/master/Differential_expression.Rpres

[brianhigh]

Okay for limma. But what about edgeR? And why not make each presentation run independently of the others? Perhaps using require would be a good compromise, so as to avoid reinstalling packages in each file if they are already present? The point here is to minimize the amount of "gotchas" for a student, especially those new to R. Good programmers make their code as user-friendly as they can, especially when the language already provides tools like require to make it easy.

[raphg]

In general, I think it's ok to expect users to install the packages. require does not actually help, see http://stackoverflow.com/questions/5595512/what-is-the-difference-between-require-and-library