Rの凡例で数式や比例記号∝などを使う方法。
expression関数で実装できる。
べき乗は10^4と書くとか
分数はfrac(1,2)と書くとかは、
R上で
help(plotmath)
とすれば調べられる。
上のコマンドより転載
例えば、タイトルが分数表示にしたければ、
curve((2/x),main=expression(frac(2,x)))
とすれば良い。
凡例の場合は、
legend(x=1,y=1,lty=1,expression(frac(2,x)))
などを用いる。
下の表は記号 意味
の順番
Syntax Meaning
x + y
x plus y
x - y x minus y
x*y juxtapose x and y
x/y x forwardslash y
x %+-% y x plus or minus y
x %/% y x divided by y
x %*% y x times y
x %.% y x cdot y
x[i] x subscript i
x^2 x superscript 2
paste(x, y, z) juxtapose x, y, and z
sqrt(x) square root of x
sqrt(x, y) yth root of x
x == y x equals y
x != y x is not equal to y
x < y x is less than y
x <= y x is less than or equal to y
x > y x is greater than y
x >= y x is greater than or equal to y
x %~~% y x is approximately equal to y
x %=~% y x and y are congruent
x %==% y x is defined as y
x %prop% y x is proportional to y
plain(x) draw x in normal font
bold(x) draw x in bold font
italic(x) draw x in italic font
bolditalic(x) draw x in bolditalic font
symbol(x) draw x in symbol font
list(x, y, z) comma-separated list
... ellipsis (height varies)
cdots ellipsis (vertically centred)
ldots ellipsis (at baseline)
x %subset% y x is a proper subset of y
x %subseteq% y x is a subset of y
x %notsubset% y x is not a subset of y
x %supset% y x is a proper superset of y
x %supseteq% y x is a superset of y
x %in% y x is an element of y
x %notin% y x is not an element of y
hat(x) x with a circumflex
tilde(x) x with a tilde
dot(x) x with a dot
ring(x) x with a ring
bar(xy) xy with bar
widehat(xy) xy with a wide circumflex
widetilde(xy) xy with a wide tilde
x %<->% y x double-arrow y
x %->% y x right-arrow y
x %<-% y x left-arrow y
x %up% y x up-arrow y
x %down% y x down-arrow y
x %<=>% y x is equivalent to y
x %=>% y x implies y
x %<=% y y implies x
x %dblup% y x double-up-arrow y
x %dbldown% y x double-down-arrow y
alpha – omega Greek symbols
Alpha – Omega uppercase Greek symbols
theta1, phi1, sigma1, omega1 cursive Greek symbols
Upsilon1 capital upsilon with hook
aleph first letter of Hebrew alphabet
infinity infinity symbol
partialdiff partial differential symbol
nabla nabla, gradient symbol
32*degree 32 degrees
60*minute 60 minutes of angle
30*second 30 seconds of angle
displaystyle(x) draw x in normal size (extra spacing)
textstyle(x) draw x in normal size
scriptstyle(x) draw x in small size
scriptscriptstyle(x) draw x in very small size
underline(x) draw x underlined
x ~~ y put extra space between x and y
x + phantom(0) + y leave gap for "0", but don't draw it
x + over(1, phantom(0)) leave vertical gap for "0" (don't draw)
frac(x, y) x over y
over(x, y) x over y
atop(x, y) x over y (no horizontal bar)
sum(x[i], i==1, n) sum x[i] for i equals 1 to n
prod(plain(P)(X==x), x) product of P(X=x) for all values of x
integral(f(x)*dx, a, b) definite integral of f(x) wrt x
union(A[i], i==1, n) union of A[i] for i equals 1 to n
intersect(A[i], i==1, n) intersection of A[i]
lim(f(x), x %->% 0) limit of f(x) as x tends to 0
min(g(x), x > 0) minimum of g(x) for x greater than 0
inf(S) infimum of S
sup(S) supremum of S
x^y + z normal operator precedence
x^(y + z) visible grouping of operands
x^{y + z} invisible grouping of operands
group("(",list(a, b),"]") specify left and right delimiters
bgroup("(",atop(x,y),")") use scalable delimiters
group(lceil, x, rceil) special delimiters
