How change font with latex text in R plot?

Question

I need to write a text, in bold face, in an R plot, using latex content but also containing a value coming from a variable.

Is there a way to write in bf a latex text containing also a value from a variable?

t1 <- TeX(paste("$\\textbf{\\left[\\frac{M}{L}\\right]_d =}$", sprintf(fmt="%.3f",XML), sep=""))

text(PosX1,PosY, t1, adj=c(0,0), cex=1.0, font=2)

In that case, the variable is XML, but putting font=2 does not change the font of the value of XML...

Here I wrote an example with a fake plot. The M/L written with TeX is in bf and I would like to have the value 0.001 value from the variable also in bf.

library(graphics)
library(latex2exp)

pdf(file="Test2.pdf", 15, 10)
par(mar=c(5.0, 5.0, 6.0, 5.0))
XML = 0.001
x = seq(0,40, 0.2)
y = 1*exp(-((x - 20)/5)^2)
plot(x,y, pch=19, cex=1.0, xlab = "X", ylab = "Y")
#
PosX = 5
PosY = 0.8
t1 <- TeX(paste("$\\textbf{\\left[\\frac{M}{L}\\right] =}$",    sprintf(fmt="%.3f",XML), sep=""))
text(PosX,PosY, t1, adj=c(0,0), cex=1.0, font=2)

dev.off()

Can you make a [mcve] and explain the expected output? Things that are unclear: Sample value for `XML`, where does `TeX()` come from, ... — Ralf Stubner, Jul 05 '19 at 07:24
I just add a small example describing what I would like to do. — Henri Plana, Jul 06 '19 at 16:03

score 0 · Answer 1 · answered Jul 06 '19 at 16:10

0

I suggest two changes:

use \mathbf instead of `\textbf¸ since you are in math mode
extend the range of \mathbf and math mode to include the number

Combined:

library(graphics)
library(latex2exp)

pdf(file="Test2.pdf", 15, 10)
par(mar=c(5.0, 5.0, 6.0, 5.0))
XML = 0.001
x = seq(0,40, 0.2)
y = 1*exp(-((x - 20)/5)^2)
plot(x,y, pch=19, cex=1.0, xlab = "X", ylab = "Y")
#
PosX = 5
PosY = 0.8
t1 <- TeX(paste("$\\mathbf{\\left[\\frac{M}{L}\\right] =",
                 sprintf(fmt="%.3f",XML),
                 "}$",
                 sep=""))
text(PosX,PosY, t1, adj=c(0,0), cex=1.0, font=2)

dev.off()

Result:

answered Jul 06 '19 at 16:10

Ralf Stubner

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Many thanks, it is working just fine. Thanks again. – Henri Plana Jul 06 '19 at 19:27
@HenriPlana You are welcome. Please consider accepting/upvoting the answer if it was helpful. – Ralf Stubner Jul 06 '19 at 19:33
I have clicked on the arrow "This answer is useful", I hope it is ok. – Henri Plana Jul 08 '19 at 17:30
@HenriPlana THat's ok. If you want to mark the answer as "accepted" you can also click the check mark, c.f. https://stackoverflow.com/help/someone-answers – Ralf Stubner Jul 08 '19 at 18:53

How change font with latex text in R plot?

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