As part of my work, I am expected to show calculation steps with sample values. To do this, I usually just replace the variable names with \Sexpr{} to add in the values. For some reason \Sexpr{} escapes math mode and breaks some of my tags. For instance, this works well:
$r_{pump} = \sqrt{(x_{pump} - x_{obs})^{2} + (y_{pump} - y_{obs})^{2}}$
It results in all values being correctly placed under the square root tag like this:
However, when I try to include \Sexpr{} tags to incorporate values like this...
$\sqrt{(\Sexpr{x[1]}(m) - \Sexpr{x[2]}(m))^{2} + (\Sexpr{y[1]}(m) - \Sexpr{y[2]}(m))^{2}}$
...I get results that look like this:
This happens when I try to include \Sexpr{} in a \frac{}{} tag as well.
Am I applying math mode ($\Stuff$) incorrectly?
Related
I am new to Julia so sorry if this question is obvious.
I am trying to use Julia to help me run a series of finite element models, which use a text input file to give instructions to the finite element solver. Basically, I would like to use Julia to read in the base input file, edit some parameters on some lines of the file and then write it as a new file. I am getting hung up on a couple things though.
Currently, I am reading in the file like this
mdl = "fullmodelSVTV"; #name of input file
A = readlines(mdl*".inp")
This read each line from the file in as a separate string in a vector which I like because it makes it easier to edit the sections I want but it also makes things more difficult when I try to write to a new file.
I am writing the file like this.
io = open("name.inp","w")
print(io,A)
close(io)
When I try to write to a new file the output ends up look like this
Output from code
which is ["string at index 1","string at index 2","string at index 3"...].
What I would like to do is output this the exact same way is it is read in with string at each index of the vector on its own line. I would also like to remove the brackets and quotation marks from the file, as they might interfere with the finite element solver.
I think I have found a way to concatenate all of the strings at each index and separated them with a new line like shown below.
for i in 1:length(A)
conc = conc*"\n"*lines[i]
end
The issue with this is that it takes a long time to do given the size of the input files I am working with and I feel like there has to achieve my goal.
I also cannot find a way to remove the brackets or quotation marks when writing the file.
So, I'm wondering if anyone has any advice for a better way to write these text files in terms of both concatenating all of the strings from the vector when outputting as well as outputting without the brackets and quotation marks.
Thanks, any advice is appreciated.
The issue with print(io,A) is that it is printing a representation of the vector, but in fact you want to print each element of the vector. To do so, you can simply print each line in a loop:
open("name.inp", "w") do io
for line in A
println(io, line)
end
end
This avoids the overhead of string concatenation.
I need to indent some math stuff in the \details section of my .Rd documentation to enhance its readability. I am using mathjaxr. Is there any way to indent without installing roxygen2 or similar?
The math stuff is inline, so simply setting to display using \mjdeqn won't solve this.
I seem to have a reasonable "cheating" work around for indenting the first line using mathjaxr, at least for the PDF and HTML output.
We need to do two things:
Use the mathjax/LaTeX phantom command. phantom works by making a box of the size necessary to type-set whatever its argument is, but without actually type-setting anything in the box. For my purposes, if I want to indent, say, about 2 characters wide, I would start the line with a \mjeqn{\phantom{22}}{ } and following with my actual text, possibly including actual mathy bits. If I want an indent of, say, roughly 4 characters wide, I might use \mjeqn{\phantom{2222}}{ }.
Because mathjaxr has a problem with tacking on unsolicited new lines when starting a line with mjeqn, we need to prefix the use of phantom in 1 above with an empty bit of something non-mathjaxr-ish like \emph{}.
Putting it all together, I can indent by about 2 characters using something like this:
\emph{}\mjeqn{\phantom{22}}Here beginneth mine indented line…
I need to explore whether the { } business actually indents for ASCII output, or whether I might accomplish that using or some such.
We are generating a pdf through exams2nops using the items in blocks of choice, we would like to delimitate the blocks in the PDF adding a horizontal line after the last exercise of each block. Having that in mind we added a ***, ---, <hr/> however the behavior was always the same:
I would like a single line without adding the exercise number that's next in the exam:
It is not so easy to solve this by putting the horizontal line into the exercise file. The reason is that the line is needed after the answerlist but the answerlist is not formatted in the exercise but by exams2nops.
A workaround is to tweak the definition of the {question} environment in the LaTeX template used by exams2nops. By default this is simply:
\newenvironment{question}{\item}{}
Where \item is executed at the beginning of the {question} and nothing at the end of it. Changing this by
\renewenvironment{question}{\item}{\hrulefill}
would insert a horizontal line after every question. If you just want it after selected questions you need to insert if/else statements for certain enumerated items. For example, for inserting the horizontal rule after the second item only, you can redefine:
\renewenvironment{question}{\item}{\ifnum\value{enumi}=2 {\hrulefill} \else {} \fi}
Thus, you get the enumi counter from the {enumerate} environment that you use and compare it with 2. If true, you insert the horizontal line, and otherwise you do nothing.
Adding escapes for the backslashes you can pass this re-definition to exams2nops through the header argument:
exams2nops(c("swisscapital", "switzerland", "tstat2", "deriv2"),
header = "\\renewenvironment{question}{\\item}{\\ifnum\\value{enumi}=2 {\\hrulefill} \\else {} \\fi}")
The resulting output is:
I need to concatenate two strings within an R object: one is just regular text; the other is italicized. So, I tried a lot of combinations, e.g.
paste0(" This is Regular", italic( This is Italics))
The desired result should be:
This is Regular This is Italics
Any ideia on how to do it?
Thanks!
In plot labels, you can use expressions, see mathematical annotation :
plot(1,xlab=expression("This is regular"~italic("this is italic")))
To provide an string for which an HTML parser will recognise the need to render the text in Italics, wrap the text in <i> and </i>. For example: "This is plain text, but <i>this is in Italics</i>.".
However, most HTML processors will assume that you want your text to appear as-is and will escape their input by default. This means that the special meanings of certain characters - including < and > will be "turned off". You need to tell the processor not to do this. How you do that will depend on context. I can't tell you that because you haven't given me context.
Are you for example, writing to a raw HTML file? (You need do nothing.) Are you writing to a Markdown file? If so, how? In plain text or in a rendered chunk? Are you writing a caption to a graphic? (Waldi has suggested a solution.) Etc, etc....
I want to create a clean label to a graph that has the species abbreviation of an ion (in this case Chloride) followed by the concentration units (micro equivalents per liter) enclosed in parentheses. As written, the code mostly produces this, but superscripts the parentheses/units section. Probably missing something small. Using this code snippet with the ylab() command in ggplot2 as a label. Thanks.
My code so far:
cl.label = expression(paste(Cl^- ~(mu~eq ~L^-1)), parse=TRUE)
In the expression, - is an operator so it needs something to "negate." You can give it a phantom object like
cl.label = expression(Cl^-phantom() ~(mu~eq ~L^-1))
or you can treat the - as a literal dash value with
cl.label = expression(Cl^"-" ~(mu~eq ~L^-1))