General
PromptBeginner5 minmarkdown
- `persp(x
y
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General
PromptBeginner5 minmarkdown
- `contour(x
y
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General
PromptBeginner5 minmarkdown
- For `image`
`x` and `y` specify **cell boundaries** or **midpoints** depending on context.
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General
PromptBeginner5 minmarkdown
- Plots columns of one matrix against columns of another. Recycles `col`
`lty`
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Data
PromptBeginner5 minmarkdown
- Formula interface: `pairs(~ var1 + var2 + var3
data = df)`.
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General
PromptBeginner5 minmarkdown
- `panel` function receives `(x
y
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General
PromptBeginner5 minmarkdown
- First argument can be an **expression** in `x` or a function: `curve(sin
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General
PromptBeginner5 minmarkdown
- `axis(side
at
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General
PromptBeginner5 minmarkdown
- `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 minmarkdown
- Read-only parameters: `cin`
`cra`
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General
PromptBeginner5 minmarkdown
- `mgp = c(3
1
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General
PromptBeginner5 minmarkdown
- `usr` with log scale: contains **log10** of the coordinate limits
not the raw values.
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General
PromptBeginner5 minmarkdown
- `las`: 0 = parallel to axis
1 = horizontal
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General
PromptBeginner5 minmarkdown
- `mai` (inches)
`mar` (lines)
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General
PromptBeginner5 minmarkdown
- 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 minmarkdown
> Non-obvious behaviors
gotchas
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Data
PromptBeginner5 minmarkdown
- Formula interface: `cor.test(~ x + y
data = df)` — note the `~` with no LHS.
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General
PromptBeginner5 minmarkdown
- **Lognormal**: `meanlog` and `sdlog` are mean/sd of the **log**
not of the distribution itself.
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General
PromptBeginner5 minmarkdown
- Returns `$estimate`
`$p.value`
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General
PromptBeginner5 minmarkdown
- **`n` argument in `r*()` functions**: if `length(n) > 1`
uses `length(n)` as the count
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General
PromptBeginner5 minmarkdown
- **Beta**: `shape1` (alpha)
`shape2` (beta) — no `mean`/`sd` parameterization.
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General
PromptBeginner5 minmarkdown
- `names = TRUE` by default
adding 0%
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Data
PromptBeginner5 minmarkdown
- Default kernel: `gaussian`. Range of density extends beyond data range (controlled by `cut`
default 3 bandwidths).
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Data
PromptBeginner5 minmarkdown
- Default bandwidth: `bw = nrd0` (Silverman's rule of thumb). For multimodal data
consider `SJ` or `bcv`.
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