list.tree {Hmisc} | R Documentation

## Pretty-print the Structure of a Data Object

### Description

This is a function to pretty-print the structure of any data object (usually a list). It is similar to the R function `str`.

### Usage

    list.tree(struct, depth=-1, numbers=FALSE, maxlen=22, maxcomp=12,
              attr.print=TRUE, front="", fill=". ", name.of, size=TRUE)

### Arguments

`struct` | The object to be displayed
`depth` | Maximum depth of recursion (of lists within lists ...) to be printed; negative value means no limit on depth.
`numbers` | If TRUE, use numbers in leader instead of dots to represent position in structure.
`maxlen` | Approximate maximum length (in characters) allowed on each line to give the first few values of a vector. maxlen=0 suppresses printing any values.
`maxcomp` | Maximum number of components of any list that will be described.
`attr.print` | Logical flag, determining whether a description of attributes will be printed.
`front` | Front material of a line, for internal use.
`fill` | Fill character used for each level of indentation.
`name.of` | Name of object, for internal use (deparsed version of struct by default).
`size` | Logical flag, should the size of the object in bytes be printed? A description of the structure of struct will be printed in outline form, with indentation for each level of recursion, showing the internal storage mode, length, class(es) if any, attributes, and first few elements of each data vector. By default each level of list recursion is indicated by a "." and attributes by "A".

### Author(s)

Alan Zaslavsky, zaslavsk@hcp.med.harvard.edu

### See Also

`str`

### Examples

    X <- list(a=ordered(c(1:30,30:1)),b=c("Rick","John","Allan"),
              c=diag(300),e=cbind(p=1008:1019,q=4))
    list.tree(X)
    # In R you can say str(X)

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