Provides a function to produce rudimentary ascii graphics directly in the terminal window.

`txtplot`

provides the basic plotting function of two numeric
vectors. All other functions below are based on this.

`txtcurve`

is a text based equivalent of the `curve`

function

`txtdensity`

is a text based density estimation function based on the
`density`

function

`txtacf`

is a text based equivalent of the `acf`

function
and based on the `acf`

function.

`txtbarchart`

is a text based barplot and plots the
relative frequences of the occurences of the different levels of a
factor (in percent)

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 | ```
txtplot(x, y = NULL, pch = "*", width = round(options()$width*0.8),
height = round(0.25*width), xlab = NULL, ylab = NULL,
xlim = NULL, ylim = NULL)
txtcurve(expr, from = NULL, to = NULL, n = 101,
pch = "*", width = round(options()$width*0.8),
height = round(0.25*width), xlab = NULL, ylab = NULL)
txtdensity(x, pch = "*", width = round(options()$width*0.8),
height = round(0.25*width), xlab = NULL, ylab = NULL)
txtacf(x, pch = "*", lag.max = 20, type = c("correlation", "covariance", "partial"),
na.action = na.fail, demean = TRUE, width = round(options()$width*0.8),
height = round(0.25*width), xlab = NULL, ylab = NULL)
txtbarchart(x, pch = "*", width = round(options()$width*0.8),
height = round(0.25*width), ylab = NULL)
``` |

`x` |
numeric containing the x-values to plot (for |

`y` |
numeric containing the x-values to plot (needs to be of the same
length as x). If NULL the numeric |

`pch` |
Plotting symbol |

`width, height` |
Width and height of the plots in points |

`xlab, ylab` |
labels for x and y axis |

`xlim, ylim` |
limits for x and y axis in plot, if equal to NULL automatically determined from x and y. |

`expr` |
An expression to plot (containing x) |

`from,to` |
Defines boundaries of plotting region for expr in txtcurve |

`n` |
integer specifying the number of x values between from and to |

`lag.max, type, na.action, demean` |
arguments for call of |

Due to rounding to a relatively crude grid results can only be approximate! The equally spaced axis ticks, for example, may be non-equally spaced in the plot.

Due to the crude grid also there might be several points per pixel. The function uses the same plotting symbol no matter how many points coincide on one pixel

Bjoern Bornkamp

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | ```
## basic plotting function
require(stats)
txtplot(cars[,1], cars[,2])
## can include axis labels when desired
txtplot(cars[,1], cars[,2], xlab = "speed", ylab = "distance")
## text based density plot
txtdensity(rnorm(500))
## text based plotting of functions
txtcurve(x/(x+1), 0, 4, xlab = "Emax model")
## text based acf
txtacf(rnorm(100))
## text based barchart
x <- factor(c("orange", "orange", "red", "green", "green", "red",
"yellow", "purple", "purple", "orange"))
txtbarchart(x)
``` |

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