Ok recently I have been experimenting with Julia's compose.jl and have run into a somewhat confusing problem. I will run the standard code to initialize the package.
Pkg.add("Compose")
using Compose
compose(compose(context(), rectangle()), fill("tomato"))
And then run that code. Here is my problem: the code executes fine, it's the output that is strange. The typical output for this code would be a red rectangle. The output I get when this code is run is this:
Context(BoundingBox(Measure{MeasureNil,MeasureNil}(0.0,MeasureNil(),MeasureNil(),0.0,0.0),Measure{MeasureNil,MeasureNil}(0.0,MeasureNil(),MeasureNil(),0.0,0.0),Measure{MeasureNil,MeasureNil}(0.0,MeasureNil(),MeasureNil(),1.0,0.0),Measure{MeasureNil,MeasureNil}(0.0,MeasureNil(),MeasureNil(),0.0,1.0)),UnitBox{Nothing,Nothing,Nothing,Nothing}(nothing,nothing,nothing,nothing,Measure{MeasureNil,MeasureNil}(0.0,MeasureNil(),MeasureNil(),0.0,0.0),Measure{MeasureNil,MeasureNil}(0.0,MeasureNil(),MeasureNil(),0.0,0.0),Measure{MeasureNil,MeasureNil}(0.0,MeasureNil(),MeasureNil(),0.0,0.0),Measure{MeasureNil,MeasureNil}(0.0,MeasureNil(),MeasureNil(),0.0,0.0)),Rotation{Point{Measure{MeasureNil,MeasureNil},Measure{MeasureNil,MeasureNil}}}(0.0,Point{Measure{MeasureNil,MeasureNil},Measure{MeasureNil,MeasureNil}}(Measure{MeasureNil,MeasureNil}(0.0,MeasureNil(),MeasureNil(),0.5,0.0),Measure{MeasureNil,MeasureNil}(0.0,MeasureNil(),MeasureNil(),0.0,0.5))),nothing,ListNode{ComposeNode}(Property{FillPrimitive}([FillPrimitive(AlphaColorValue{RGB{Float64},Float64}(RGB{Float64}(1.0,0.38823529411764707,0.2784313725490196),1.0))]),ListNode{ComposeNode}(Form{RectanglePrimitive{P<:Point{XM<:Measure{S,T},YM<:Measure{S,T}},M1<:Measure{S,T},M2<:Measure{S,T}}}(RectanglePrimitive[RectanglePrimitive{Point{Measure{MeasureNil,MeasureNil},Measure{MeasureNil,MeasureNil}},Measure{MeasureNil,MeasureNil},Measure{MeasureNil,MeasureNil}}(Point{Measure{MeasureNil,MeasureNil},Measure{MeasureNil,MeasureNil}}(Measure{MeasureNil,MeasureNil}(0.0,MeasureNil(),MeasureNil(),0.0,0.0),Measure{MeasureNil,MeasureNil}(0.0,MeasureNil(),MeasureNil(),0.0,0.0)),Measure{MeasureNil,MeasureNil}(0.0,MeasureNil(),MeasureNil(),1.0,0.0),Measure{MeasureNil,MeasureNil}(0.0,MeasureNil(),MeasureNil(),0.0,1.0))]),ListNull{ComposeNode}())),0,false,false,false,false,nothing,nothing,0.0)
a rather lengthy piece of text that doesn't show the shape... I am wondering if this is an error or if I am just doing something wrong. Does anyone know how to make this output what it should be?
One possibility to open an image through REPL would be through TerminalExtensions.jl. But generally I believe you have to write the image to a file and then open it. To save the file use this,
julia>draw(PNG("test.png", 10inch, 10inch), compose(compose(context(), rectangle()), fill("tomato")))
This is my first time using R so this is about as basic of a question as they come.
I am making a presentation using markdown (ioslides). I want to do something very simple which is to put something in superscript. According to the manual, the syntax is the following:
Lower bound = α^Full – K^ - α^Full^
The first time I tried running this, I got a pop-up screen with some options. Too quickly, I pressed enter and inadvertently chose something. Now the syntax won't run and I can't figure out what I did to undo it.
Can someone help? Thank you in advance.
Markdown allows HTML to be used if necessary, so you should be able to use the HTML sup tag.
I'm writing all my scripts on .R file using R for mac. It is convenient to me because there are colors to highlight the type of commands.
I have a many comments following the # symbol that are useful when I forget about the meaning of my script but they tend to blur my script so that it gets harder to find a given command line.
Is there a way to hide and show these comments ? (Using the programm I'm currently using or another one). What would you suggest as the best program to write R script ?
Thanks a lot !
RStudio supports code folding. You can standardize your comment blocks so that they are recognized as code blocks.
For example, enter this into your RStudio editor
#=======================================================
# this is a comment block
# more comments here
# comments upon comments
and then press Alt+L to fold, and Alt+Shift+L to unfold.
Try RStudio for mac. One of the greatest code writing environment for R there is.
You can also try Emacs, which is more like old-fashioned command line editor. You can find a good guide here.
As I am using Mathematica a lot I got the idea to write a small and free CAS which just exposes a very small subset of necessary functions and packages to be used and I want to present the results in an appropriate way to the user like Mathematica does (ignore the Facebook logo in the background :D ):
My first idea was to create LaTeX code in the background and to pdflatex the source and include the PDF then in the view... however this seems way to much overkill! I want to write this CAS either in C++ or C# and I want to know if there are any recommended solutions to output nice formula like that.
My first thought was a "real-time formula editing view" but it would be ok to have an input box to enter the commands and formulas and the upper view just to be uneditable output.
A few ways come to my mind.
Use LaTeX behind the scenes to typeset equations, as you say. Again, Cadabra does this.
Use TeXmacs as the front end. Cadabra does this.
Use MathJax. This is a javascript framework which renders TeX equations to images or MathML. It's very easy to use it if you have a HTML view in your UI toolkit. MathJax is used in the sister site MathOverflow, for example.
I find the route 3 is the most attractive.
For calling LaTeX in the background, don't use pdflatex, but use the non-PDF latex to produce a DVI file, and convert it then to PNG with dvipng.
Have a look at the preview package or the standalone class to get the output in the right size (i.e. only the formula, not a whole page).