General
PromptBeginner5 minmarkdownQuality: 24
- Must call dev.off() to finalize the file. Without it
file may be empty/corrupt.
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General
PromptBeginner5 minmarkdownQuality: 24
- `rect(xleft
ybottom
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Coding & Debugging
PromptBeginner5 minmarkdownQuality: 24
- arrows: code = 1 (head at start)
code = 2 (head at end
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General
PromptBeginner5 minmarkdownQuality: 24
- `persp(x
y
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General
PromptBeginner5 minmarkdownQuality: 24
- `contour(x
y
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General
PromptBeginner5 minmarkdownQuality: 24
- For image
x and y specify cell boundaries or midpoints depending on context.
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General
PromptBeginner5 minmarkdownQuality: 24
- Plots columns of one matrix against columns of another. Recycles col
lty
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General
PromptBeginner5 minmarkdownQuality: 24
- panel function receives `(x
y
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Data
PromptBeginner5 minmarkdownQuality: 24
- Formula interface: `pairs(~ var1 + var2 + var3
data = df)`.
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General
PromptBeginner5 minmarkdownQuality: 24
- First argument can be an expression in x or a function: `curve(sin
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General
PromptBeginner5 minmarkdownQuality: 24
- Read-only parameters: cin
cra
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General
PromptBeginner5 minmarkdownQuality: 28
- mtext: line argument positions text in margin lines (0 = adjacent to plot
positive = outward). adj controls horizontal position (0-1).
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General
PromptBeginner5 minmarkdownQuality: 24
- `axis(side
at
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General
PromptBeginner5 minmarkdownQuality: 24
- usr with log scale: contains log10 of the coordinate limits
not the raw values.
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General
PromptBeginner5 minmarkdownQuality: 24
- las: 0 = parallel to axis
1 = horizontal
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General
PromptBeginner5 minmarkdownQuality: 24
- `mgp = c(3
1
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General
PromptBeginner5 minmarkdownQuality: 24
Non-obvious behaviors
gotchas
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General
PromptBeginner5 minmarkdownQuality: 24
- mai (inches)
mar (lines)
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General
PromptBeginner5 minmarkdownQuality: 28
- Setting mfrow/mfcol resets cex to 1 and mex to 1. With 2x2 layout
base cex is multiplied by 0.83; with 3+ rows/columns
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General
PromptBeginner5 minmarkdownQuality: 28
- Lognormal: meanlog and sdlog are mean/sd of the log
not of the distribution itself.
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Data
PromptBeginner5 minmarkdownQuality: 24
- Formula interface: `cor.test(~ x + y
data = df) — note the ~` with no LHS.
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General
PromptBeginner5 minmarkdownQuality: 24
- Returns $estimate
$p.value
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General
PromptBeginner5 minmarkdownQuality: 24
- n argument in r*() functions: if length(n) > 1
uses length(n) as the count
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General
PromptBeginner5 minmarkdownQuality: 24
- Beta: shape1 (alpha)
shape2 (beta) — no mean/sd parameterization.
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