Historize | R Documentation |

Provides storage for function calls.

Historize(fun, len = 0, ...)

`fun` |
Function of one or several variables. |

`len` |
Allowed length of the input variables. |

`...` |
Additional parameters to be handed to the function. |

Historize() adds storage to the function. If `len=0`

then only
function values will be stored in a vector, if `len>0`

then
variables and function values will be stored in a matrix, one line
for every function call.

If `Fn = Historize(...)`

is the 'historized' function, then the
storage can be retrieved with `Fn()`

and can be cleared with
`Fn(NULL)`

.

Filling the storage will take extra time and can slow down the
function calls. Especially also storing the variables used in the
call (with `len>0`

) will make it considerably slower.

Functions can have multivariate output; the user is asked to take care of handling the output vector or matrix correctly. The function may even require additional parameters.

Returns a function identical to the original function, but the new function will now store its function calls in a vector or matrix.

Can also be applied to functions that output a vector (same length for every call).

Hans W. Borchers

`trace`

Fn <- Historize(fnRastrigin) dm <- 10 lb <- rep(-5.2, dm); ub <- -lb # Fn(NULL) sol <- simpleDE(Fn, lower = lb, upper = ub) fvalues <- Fn() fvals <- cummin(fvalues) ## Not run: plot(fvalues, type = 'p', col = 7, pch = '.', cex = 2, main = "Simple DE optimization", xlab = '', ylab = '') lines(fvals, col = 2, lwd = 1) legend(length(fvalues), max(fvalues), c("Intermediate values", "cummulated min"), xjust = 1, col = c(7, 1), lwd = 2) grid() ## End(Not run)

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